Download Architecture for HomeGate, the Residential Gateway

ISO/IEC JTC 1/SC 25/WG 1
N 912
Date: 2000-04-01
ISO/IEC JTC 1/SC 25/WG 1
Interconnection of Information Technology Equipment
Home Electronic System
Title:
CD1 15045-01: Information technology — Interconnection of information
technology equipment — Architecture for HomeGate, the residential gateway
(AHRG)
Source:
ISO/IEC JTC 1/SC 25/WG 1
Project:
Project: 25.01.03.02
Status:
Committee Draft 1 (CD1)
Requested Action:
SC25 Ballot
Distribution:
SC 25
ISO/IEC
CD1 15045-01
JTC 1/SC 25 WG 1 N 912
Project: 25.01.03.02
Committee Draft 1
CD1 15045-01: Information technology —
Interconnection of information technology
equipment — Architecture for HomeGate,
the residential gateway (AHRG)
CD1 15045-01  ISO/IEC:2000
ISO/IEC JTC1 SC25 WG1 N912
Contents
1. SCOPE 1
1.1 PART 1 - ARCHITECTURE OF THE RESIDENTIAL GATEWAY ................................................. 1
1.1.1 Architectural Overview .................................................................................................................. 1
1.1.2 Architectural Domains of the RG .................................................................................................. 1
1.1.3 System Description ....................................................................................................................... 1
1.2 PART 2 SYSTEM COMPONENTS ................................................................................................. 1
1.2.1 Logical Architecture and HomeGate Internal Protocol (HGIP) ..................................................... 1
1.2.2 System and Network Addressing ................................................................................................. 1
1.3 PART 3 - INTEROPERABILITY...................................................................................................... 2
1.3.1 Network Interoperability ................................................................................................................ 2
1.4 PART 4 - SECURITY, PRIVACY AND SAFETY ............................................................................ 2
1.5 PART 5 - BASE LEVEL PROFILE ................................................................................................. 2
1.6 PART 6 - GIP AND INTERFACES - PCI ........................................................................................ 2
1.6.1 Physical Architecture .................................................................................................................... 2
1.6.2 Residential Gateway Common Interface - PCI............................................................................. 2
1.7 PART 7 - GIP AND INTERFACES - CARD BUS ........................................................................... 2
1.8 SRG PROFILES .............................................................................................................................. 3
2. NORMATIVE REFERENCES ........................................................................................................... 4
3. DEFINITIONS AND ABBREVIATIONS ............................................................................................ 5
1. FUNCTIONAL DESCRIPTION OF RESIDENTIAL GATEWAYS .................................................... 1
1.1 GATEWAY FUNCTIONS ................................................................................................................ 1
2. ARCHITECTURAL OVERVIEW FOR RESIDENTIAL GATEWAYS ................................................ 3
3. ARCHITECTURAL DOMAINS FOR THE RESIDENTIAL GATEWAY ............................................ 3
3.1 THE DOMAIN OF THE RESIDENTIAL GATEWAY ....................................................................... 4
3.2 THE DOMAINS FOR INTERFACES TO THE RESIDENTIAL GATEWAY .................................... 4
3.3 DATA STREAMS ............................................................................................................................ 6
4. STANDARDISED COMPONENTS OF GATEWAY .......................................................................... 7
4.1 COMPONENTS OF GATEWAY ..................................................................................................... 7
4.1.1 WAN Gateway Interface (WGI) .................................................................................................... 8
4.1.2 LAN Gateway Interface (LGI) ....................................................................................................... 9
4.1.3 HomeGate Internal Protocol (HGIP) ........................................................................................... 10
4.2 STRUCTURAL IMPLEMENTATIONS OF RG .............................................................................. 11
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4.2.1 Simple Gateway Example (informative) ..................................................................................... 11
4.2.2 Complex Integral Gateway Example (informative) ..................................................................... 11
4.2.3 The Complex Modular Gateway Example (informative) ............................................................. 12
4.2.4 Distributed Gateways Example (informative) ............................................................................. 13
5. HOMEGATE SOFTWARE FUNCTIONAL REQUIREMENTS ....................................................... 15
5.1 ESSENTIAL TERMINOLOGY....................................................................................................... 16
5.1.1 HES ........................................................................................................................................... 16
5.1.2 CONTROL CHANNEL—HES Class 1 ........................................................................................ 16
5.1.3 DATA CHANNEL—HES Class 2 or Class 3 .............................................................................. 17
5.1.4 WAN ........................................................................................................................................... 17
5.1.5 LAN ........................................................................................................................................... 17
5.1.6 HomeGate .................................................................................................................................. 17
6. HOMEGATE SOFTWARE ARCHITECTURE ................................................................................. 17
6.1 SUMMARY .................................................................................................................................... 17
6.2 HESA ........................................................................................................................................... 18
6.3 WASA ........................................................................................................................................... 18
6.4 LASC ........................................................................................................................................... 19
6.5 HODC ........................................................................................................................................... 19
6.6 SECURITY DECODER ................................................................................................................. 19
6.7 HGIP ........................................................................................................................................... 19
7. HOMEGATE APPLICATIONS ........................................................................................................ 20
8. PRIVACY AND FIREWALL FUNCTIONS ...................................................................................... 20
1. LANGUAGE AND ADDRESSING FOR RESIDENTIAL GATEWAY ............................................... 1
1.1.1 Addressing .................................................................................................................................... 1
1.1.2 Commands ................................................................................................................................... 1
1.1.3 APIs ............................................................................................................................................. 1
1. NETWORK INTEROPERABILITY FOR THE RESIDENTIAL GATEWAY ...................................... 2
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CD1 15045-01  ISO/IEC:2000
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Foreword
ISO (the International Organization for Standardization) and IEC (the International
Electrotechnical Commission) form the specialized system for worldwide
standardization. National bodies that are members of ISO or IEC participate in the
development of International Standards through technical committees established by the
respective organization to deal with particular fields of technical activity. ISO and IEC
technical committees collaborate in fields of mutual interest. Other international
organizations, governmental and non-governmental, in liaison with ISO and IEC, also
take part in the work.
In the field of information technology, ISO and IEC have established a joint technical
committee, ISO/IEC JTC 1. International Standards adopted by the joint technical
committee are circulated to national bodies for voting. Publication as an International
Standard requires approval by at least 75% of the national bodies casting a vote.
This Committee Draft 15045-01 was prepared by Joint Technical Committee ISO/IEC
JTC 1, Information technology, Subcommittee SC 25, Interconnection of Information
Technology Equipment.
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Introduction
INTRODUCTION & SCOPE
Architecture for Residential Gateways (AHRG)
1. Scope
This document defines HomeGate, the Architecture for Residential Gateways (AHRG)
for Home Electronic System (HES) according to the standardisation process of ISO/IEC.
The AHRG provides the definitions and requirements to which any Residential Gateway
shall conform if it is to be classed as compliant with the International Standard for
Residential Gateways. It identifies the generalised architecture, the system boundaries,
system addressing requirements, the physical interfaces and the requirements for
security, privacy and safety to which Residential Gateways and their components,
conformant with the standard, shall comply.
The format of this standard document is designed to offer a "future proof," forward and
backward compatible standard for Residential Gateways and for networks and devices
to which they are interfaced.
The following requirement categories define the scope of the document and provide the
framework for an expandable standard and document structure:
1.1 Part 1 - Architecture of the Residential Gateway
1.1.1 Architectural Overview
This section provides a generalised discussion of the requirements, architecture and
permissible profiles for Residential Gateways. (15045-01)
1.1.2 Architectural Domains of the RG
This section of the document defines the domains of each element of a Residential
Gateway. (15045-01)
1.1.3 System Description
This section of the document defines the main components and describes potential
structural implementations of a Residential Gateway (15045-01)
1.2 Part 2 System Components
1.2.1 Logical Architecture and HomeGate Internal Protocol (HGIP)
This section describes the protocols, addressing, functions and commands which control
data traffic between Networks and the RG. The HES language described is a necessary
component of the Architecture for Residential Gateways. (15045-01)
1.2.2 System and Network Addressing
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Introduction
This section defines how components of the RG refer and communicate with one
another and with devices beyond the domain of the RG on internal and external
networks.
(15045-02)
HES SOFTWARE?
1.3 Part 3 - Interoperability
1.3.1 Network Interoperability
This section defines the requirements for a RG for interoperability between Networks.
(15045-02). This section does not mandate specific network protocols.
1.4 Part 4 - Security, Privacy and Safety
This section defines the requirements for security, privacy and safety which a RG shall
support to comply with the standard. There is provision for levels of support in order to
provide a measured trade off between risk and cost. (15045-03)
1.5 Part 5 - Base Level Profile
This Part of the Standard for Residential Gateways defines the requirements for
gateways compliant with the "Base Level Profile". This Standard 14045-04 calls on the
requirements and specifications of Parts 1, 2 and 3 of this Standard.
1.6 Part 6 - GIP and Interfaces - PCI
1.6.1 Physical Architecture
This section defines the physical requirements of interfaces between the Gateway
Internal Protocol and devices interfacing to the GIP. (15045-01)
1.6.2 Residential Gateway Common Interface - PCI
This section defines a set of common standard interfaces and internal protocols for the
PCI bus to which the RG shall comply - each interface and protocol accommodates a
particular level of capability and provides increased levels of capability for future
requirements. (15045-05,..,09)
1.7 Part 7 - GIP and Interfaces - Card Bus
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Introduction
1.8 SRG Profiles
The Standard for Residential Gateway is designed such that many Gateway topologies
may comply with the standard. Thus there is a set of clearly defined profiles which
determine the functionality of a Standard compliant Residential Gateway. These are
shown in Table 1.1 below.
Level
01
01
01
01
01
01
Document Reference
15045-01
15045-02
15045-03
15045-04
15045-0X
15045-10
Description
Architecture, System Description, Addressing
System Components
Network Interoperability
Security, Privacy, and Safety
Additional requirements to 1-04 to 1-09
Base Level Profile Residential Gateway: 2000: 1-01 through 1-09
Supports Levels 01
Suitable for WAN:LAN (1:1) Residential Gateways
02
15045-11
Common Interface and Internal Protocol Standard - PCI
02
15045-12
Common Interface and Internal Protocol Standard
Card Bus/PCMCIA
Common Interface and Internal Protocol Standard - IEEE1394
02
15045-13
Common Interface and Internal Protocol Standard - TBD in future
02
15045-14
Common Interface and Internal Protocol Standard - TBD in future
02
15045-15
12
15045-20
Profile Level 2 - Modular Residential Gateway: 2000: 4,5/6
Supports Levels 2-05 through2-09
Suitable for multiple WAN:LAN Residential Gateways
01
15045-16
Language and Addressing requirements for devices, messages
and routing within the SRG
01
15045-05
Uniform Device Driver
01
15045-06
OS Services
01
15045-07
Network Addressing Applications
02
15045-08
Network Interoperation Applications
02
15045-09
Applications essential for Network and RG
01
15045-16
Security and Privacy Application Level 1
02
15045-17
Security and Privacy Application Level 2
01
15045-18
Tests Specification and Safety Requirements
Gateways comply to the standard if they conform to:
01
15045-10 2000: 1,2,3
Base Level Profile
10
15045-20 2000:10,11
Modular Level Profile using PCI
10
15045-20 2000:10,12
Modular Level Profile using Card Bus/PCMCIA
10
15045-20 2000:10,13
Modular Level Profile using IEEE1394c High Speed.
Table 1.1 Profiles and Levels of the Residential Gateway
Note: The term level in this table corresponds to architecture level
Table entries in Italics denote future developments for this standard
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Introduction
2. Normative References
This Technical Report incorporates by dated or undated reference, provisions from other
publications. These normative references are cited at the appropriate places in the text
and the publications listed hereafter. For dated references, subsequent amendments to,
or revisions of any of these publications apply to that standard only when incorporated in
it by amendment or revision. For undated references the latest edition of the publication
referred to applies.
CCITT V.41
EN 300 402
EN 300 403
EN 301 240
EN 50083-1
EN 50090-2-2
EN 50173
EN 60603-7
ETR 328
ETS 300 001
ETS 300 007
ETS 300 701
IEC61883
IEEE1394
ISO/IEC 8802.3
ISO/IEC 8802.5
ISO/IEC
8482 :1993/12
prEN 301 145
prENV 50090-6-4
RFC 791
TBR21
TBR3
TS GSM 02-63
UTE C 15-100
Code-independent error-control system
ISDN - DSS1 protocol - Data link layer
ISDN - DDS1 protocol - specification for ISDN signalling network layer for
circuit mode basic call control.
Digital Enhanced Cordless Telecommunications (DECT); Data Services
Profile (DSP); Point-to-Point Protocol (PPP) interworking for internet access
and general multi-protocol datagram transport
Cabled distribution systems for television, sound and interactive multimedia
signals - Part 1 : Safety requirements
Home and Building Electronic Systems (HBES) Part 2-2 : System Overview
General Technical Requirements
Information Technologies. Generic cabling
Connector for frequencies lower than 3 MHz for use with printed circuit
boards
Transmission and Multiplexing (TM); Asymmetric Digital Subscriber Line
(ADSL); Requirements and performance
Attachment to PSTN - General technical requirements for equipment
connected to an analogue subscriber interface in the PSTN
ISDN - Support of packet mode terminal by an ISDN (SAPI 16)
Digital Enhanced Cordless Telecommunications (DECT); Data Services
Profile (DSP); Generic frame relay service with mobility (service types A and
B, class 2)
Consumer audio/video equipment - Digital interface
IEEE Standard for a High Performance SerialBus", IEEE Std 1394-1995
Information technology -- Telecommunications and information exchange
between systems -- Local and metropolitan area networks -- Specific
requirements -- Part 3: Carrier sense multiple access with collision detection
(CSMA/CD) access method and physical layer specifications
Information technology -- Telecommunications and information exchange
between systems -- Local and Metropolitan Area Networks -- Specific
requirements -- Part 5: Token ring access method and physical layer
specifications
Standard for Electrical Characteristics of Generators and Receivers for user
in Balanced Digital Multipoint Systems
ISDN - DSS1 protocol - Teleaction Bearer Service - protocol (SAPI 12)
Home and Building Electronic Systems, HBES : Part 6-4 : Interfaces Gateway between HBES and Wide Area Communication Networks
Internet Protocol
Terminal Equipment (TE); Attachment requirements for pan-European
approval for connection to the analogue Public Switched Telephone
Networks (PSTNs) of TE (excluding TE supporting the voice telephony
service) in which network addressing, if provided, is by means of Dual Tone
Multi Frequency (DTMF) signalling
Integrated Services Digital Network (ISDN); Attachment requirements for
terminal equipment to connect to an ISDN using ISDN basic access
GSM data - Packet data on signalling channel service (PDS)
Low-voltage electrical installations
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Introduction
3. Definitions and Abbreviations
ADSL
API
AHRG
ATM
CATV
CLIP
CMP
CPE
DAVIC
DCM
DHCP
DL
DS
DV
DVB
DVB-C
DVB-MC
DVB-MS
DVB-S
DVB-SMATV
DVB-T
DVCR
DVD
D-VHS
EBU
EMC
ERG
FAV
FCM
FCP
FTP
GI
GIP
GSM
HAB
HAE
HAI
HAI/HAI-RF
HAN
HAVi
HBES
HCS
HDD
Asymetric Digital Subscriber Loop - a high bandwidth service
superimposed on analogue PSTN lines to the premise
Application Programming interface
Architecture for HomeGate, the Residential Gateway
Asynchronous Transfer Mode
Community Antenna TV
Calling line identification Presentation
Connection Management Procedure (defined in [7])
Customer Premises Equipment
Digital Audio Video Council
Device Control Module (defined in [14])
Dynamic Host Configuration Protocol
Datalink Layer
Data-Strobe
Digital video format used by digital Camcorders
Digital Video Broadcasting
DVB cable transmission standard (ETS 300 429)
DVB Microwave Multipoint Distribution Systems (MMDS) below 10 GHz
DVB Microwave Multipoint Distribution System s (MMDS) below 10 GHz
DVB satellite transmission standard (ETS 300 421)
DVB satellite master antenna television delivery standard (ETS 300 473)
DVB terrestrial transmission standard (ETS 300 744)
Digital Video Cassette Recorder
Digital Versatile Disk
Digital VHS
European Broadcasting Union
Electromagnetic Compatibility
European Residential Gateway
Full Audio-Video device (defined in [16])
Function Control Module (defined in [16])
Function Control Protocol
File Transfer Protocol
GIP Interface - Specific interface to the GIP to which LGI and WGI
modules shall conform
Gateway Internal Protocol - Protocol, Addressing and Data format for
interchanging data between the LGI and WGI
Global Systeme Mobile - Mobile phone standard
Home Automation Bus - Any electronic networking system that
interconects equipment and devices in the home
Home Automation Equipment - Appliances and/or domestic equipment
capable of being interfaced to a Home Automation Bus Such equipment
may be capable of requesting addresses in the WAN or of being
addressed from the WAN via the ERG
Home Automation Interface - Interface between the LGI and HGM
Home Automation Interface/Radio Frequency Home Automation Interface
Home Access Network
Home Audio Video interoperability
Home and Building Electronic System - Any electronic networking system
that interconects equipment and devices in the home
Home Control System - Any electronic networking system that interconects
equipment and devices in the home
Hard disk drive
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Introduction
HES
HGM
HHU
HLN
HPCF
HTTP
IAV
IDTV
IETF
IHDN
IP
IRD
ISDN
ISN
LAN
LGI
LI
LLC
MAC
MMDS
MMI
MPEG
MPEG2-pTS
MPEG2-TS
MPTS
NAT
NT
OAM
OSI
PC
PHY
PID
PIU
PLC
POF
PPP
PSTN
PSU
RBB
RC
RF
RFI
RG
RS
RU
SDH
SI
SIU
SLI
Home Electronic System - ISO Technical Report Type 2 number 14543
describes the architecture of HES, as specified by ISO/IEC
JTC 1/SC 25/WG 1.
Home Automation Bus Gateway Module
Hand Held Unit - Hand Held computer used to initialise equipment
Home Local Network
Hard Polymer Clad-Fiber
Hyper Text Transfer Protocol
Intermediate Audio-Video device (defined in [16])
Integrated Digital TV, i.e. a TV containing a STB
Internet Engineering Task Force
In-Home Digital Network
Internet Protocol
Integrated Receiver Decoder
Intergrated Services Digital Network
Interface to Specific Local Area Network
Local Area Network capable of carrying voice, data and entertainment
services within the premise. LANs may utilise existing mains cabling,
telephone wiring, RF or wide bandwidth services such as Fibre Optical
Cables, Coax, TP using standard protocols as IEEE1394, ISO 8802.3
etc…
LAN Gateway Interface - Functional Module which interfaces the ERG to a
Local Area Network
LAN Interface - Generic interface between LGI and HAI
Link layer Control
Medium Access Protocol
Microwave Multipoint Distribution Systems
Man Machine Interface
Moving Pictures Experts Group
MPEG2 Partial Transport Stream (defined in [15])
MPEG2 Transport Stream (defined in [14])
Multi Program Transport Stream
Network Address Translation
Network Termination
Operations And Maintenance
Open System Interconnection
Protocol Conversion
Physical Layer
Packet IDentifier
Pulse Interface Unit
Power Line Carrier
Plastic Optical Fiber
Point of Presence Protocol
(analogue) Public Switched Telephone Network
Power Supply Unit
Residential Broadband
Return Channel
Radio Frequency
Radio Frequency Interference
Residential Gateway
Reed-Solomon
Remote User
Synchronous Digital Hierarchy
Service Information
Serial Interface Unit
Specific Lan Interface
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Introduction
SNAP
SONET
SP
SPTS
STB
STB
SWI
TP
UI
User
UTP5
WAN
WGI
DEFINITIONS
application
bus
bus address
device
device driver
operating
system
user
SubNetwork Attachment Point
Synchronous Optical Network
Service Provider - any organisation or operator which provides a service to
or via equipment in the premise (often) from the WAN
Single Program Transport Stream
Set Top Box - Equipment which allows a TV to receive cable, satellite and
digital broadcasts
Set Top Box
Specific WAN Interface
Twisted Pair
User Interface
Any person who has access to to a home automation system (including
service providers)
Unshielded Twisted pair (cat. 5)
Wide Area Network capable of carrying voice, data and entertainment
services to and from the premise. WANs are external to the premise and
may be telecommunication networks, data networks or entertainment
networks such as Cable, or Satellite.
WAN Gateway Interface - Functional Module which Interfaces the ERG to
a Wide Area Network
Software the runs on the operating system
A communication path connects several bus members
An identifier associated with a bus member
A consumer device in the Home Electronic System (HES).
Operating system software for interacting with a device
Controlling software within the Home Electronic System
Any person who has access to to a home automation system (including
service providers).
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Part 1 - Architecture of Residential Gateways
PART 1 - Architecture of Residential Gateways
1. Functional Description of Residential Gateways
The Residential Gateway (RG) is a component of home control and data networking
systems. It allows communication between devices within the premises and systems,
service providers, operators and users in the external environment outside the premise.
The RG enables Service providers to deliver tele-services such as tele-care, home
appliance control and preventive maintenance, remote metering and security monitoring;
other service providers may provide energy management, entertainment services or
information. The RG connects the remote user with the equipment, appliance or service
in the home.
WIDE AREA NETWORK DOMAIN
Service Provider 1
Digital TV
LOCAL AREA NETWORK DOMAIN
Service Provider 2
Equipment
Maintenance
Service Provider 3
Security Service
Lighting &
Environment
Control
WIDE AREA
Service Provider 4
Energy
Management
Temperature
Sensor
(Thermostat)
Security
Sensor
COMMUNICATION
NETWORKS
RESIDENTIAL
GATEWAY
Service Provider 5
Utility Metering
PC
TV &
STB
12345. 6
Service Provider 6
Home Voice Control
CO
Sensor
Central
Heating
Boiler
Appliance
Heating
Radiator
Utility Meter
Analogue Telephone Connection
High Bandwidth Entertainment Bus
Home Automation Bus (Node)
Diagram 2.1: Service provision for home automation applications
1.1 Gateway Functions
The RG acts as a connection between the external world outside the premises and
networks within it. Operators, service providers and other systems communicate with
appliances, equipment and systems attached to local networks within the home via a
gateway to wide area communication networks. Thus the gateway may

Carry data between WAN and LAN
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Part 1 - Architecture of Residential Gateways

Route data and voice communication securely between the WAN and LAN

Route data and voice between LANs

Ensure only the correct data is allowed in and out of the premises (Firewall property)

Convert between internal and external addresses

Convert protocols and data

Interface to one or more WANs

Interface to one or more LANs

Accommodate application-specific controllers

Include a repository for WAN service providers

Select channels for bandwidth-limited LANs, such as IEEE 1394

And/or………
Some of the potential elements of a Residential Gateway are shown in the following
diagram1. In all cases the gateway provides the mechanism whereby Wide Area
Networks communicate with Local Area Networks. The gateway may be a standalone
gateway; it may be embedded in another device; or more than one gateway unit may be
used. A number of distributed gateway units may display the behaviour of a single
gateway.
N
RESIDENTIAL GATEWAY
N
N
DLC/PLC
EHS/EIB
N
PSTN
CEBus
N
LON
N
ISDN
N
N
RESIDENTIAL
GATEWAY
Home
Network
N
ISO 8802.3
Ethernet LAN to PCs
GSM/UTMS
IEEE1394a
A/V Equipment/Digital TV
CABLE
Bluetooth
SATV
Hiperlan
xDSL
RF Links to
mobile, PC
and
Entertainment
Systems
RG - Residential Gateway
N - Node on Home Automation Network
Diagram 2.2: Schematic of Residential Gateway
1
Note: it is not expected that a single gateway would accommodate all these options - rather one or two WAN types of
Access Network and one or two types of Local or Home Network
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Part 1 - Architecture of Residential Gateways
2. Architectural Overview for Residential Gateways
The Residential Gateway (RG) is a physical or logical device that provides a common,
secure, safe and intelligent interface between Wide Area Networks (WAN) in the
external environment (to the premise) and internal (to the premise) Local Area Networks
(LAN) and devices. The interface and mediation capabilities of the RG enable
independent evolution of the technologies and physical media used in the WAN and
LAN. This attribute of the RG makes evolution and innovation in both the service
delivery and consumer arenas feasible. It enables service providers and application
vendors to offer a variety of multimedia services while masking the complexity of the
service access from the consumer.
The physical architecture of a residential gateway is outside the scope of this standard.
This standard will accommodates a range of potential configurations. Such
configurations may range from a "black box" approach, where the functionality for
interfacing between two or more WANs and LANs is provided within the single box, to a
modular, dedicated residential gateway, to situations where multiple residential
gateways are distributed to physically separate locations within a premise2.
A residential gateway that conforms to this standard shall conform to the functional
requirements of this standard for Interoperability between networks, Residential
Gateway Internal Protocols (addressing, commands, and language), Security, Privacy
and Safety. This requirement allows two or more standard conforming "black box"
residential gateways to interoperate if attached to the same network.
3. Architectural Domains for the Residential Gateway
This standard applies to systems within the domain of the Residential Gateway and to
the components of a Home Electronic System which are directly responsible for the
functions and operation of the gateway. These components are:
 The Internal Gateway Architecture
 The Network Interfaces
 The Requirements of Distributed Gateways
This is shown in the following sections:
2
The "black box" approach may appeal to manufacturers of simple "application-specific" gateways, set-top boxes, cable
modems, and broadband access providers. However, where there are multiples of such boxes, they shall be capable of
interworking as a "distributed" gateway to conform to this standard.
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3.1 The Domain of the Residential Gateway
Diagram 2.3. The Domain of the Residential Gateway Standard
This standard only applies to the transmission of information between the external
environment of a premise (the Wide Area) and the internal environment of the premise
(the Local Area). In the external environment, information is delivered using Wide Area
Networks (WANs) such as telephone or cable networks, In the internal environment
information is transmitted across Local Area Networks (LANs) such as internal telephone
connections or Home Electronic Systems. The Residential Gateway is solely concerned
with ensuring that information can be transmitted between networks in a secure, safe
and transparent manner. There are many WAN and LAN systems, the primary function
of the RG is to ensure that information exchanged between them is presented in a
standard format conforming to the Gateway's Internal Protocol. The Interface to specific
WANs and LANs (see the portion of Diagram 2.4 labelled "Network Domain" is the
responsibility of other international and national standards, and proprietary
specifications.
3.2 The Domains for Interfaces to the Residential Gateway
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DOMAIN OF RESIDENTIAL
GATEWAY STANDARD
NETWORK DOMAIN
Interface to
WAN/LAN
Network Specific
Private MIB
RGIP
Private MIB
Processes to Adapt
Data/Protocols
Shared
MIB
Interface to RGIP
WAN/LAN INTERFACE
DEVICE
Diagram 2.4 Functional Domains of the Interfaces between Networks and the
Internal Architecture of the Residential Gateway.
A conforming Residential Gateway should convert information in the form of data,
entertainment services or voice transmissions between the protocols, addresses and
data structures of a WAN to those of a LAN and vice versa. Where there is more than
one possible WAN or LAN to be considered, the data traffic passing through the
gateway may be normalised. This applies equally in a RG where a number of Networks
are interfaced within a single (Integral) device or where flexibility in the form of a
"modular" architecture is to be offered.
A conforming Residential Gateway shall transform the data, packaging and addressing
to a form and format suitable for the Network Interface and the WAN or LAN. A
conforming Residential Gateway should transform data to the Gateway Internal Protocol
to permit interoperability among components.
NOTE: Conceptually, the WAN/LAN Interface device is modular, a circuit of an
integrated design or is split into two parts whether realised as a collection of modules, or
as an integrated circuit or is implemented in firmware,. One part is in the domain of the
Network and has the responsibility of ensuring that it provides the correct presentation to
the network it interfaces to. The second part interfaces to the core Gateway Internal
Protocol and Architecture and conforms to the Residential Gateway standard in ensuring
that it provides the correct presentation to the GIP of the Residential Gateway.
NOTE: The designer of the interface may use a Network-Specific Private MIB to control
the processes that adapt data from the Gateway to the required presentation of the
Network and a GIP MIB to control the processes that adapt data to the presentation
required by the GIP. Furthermore, there will be information which is required for both
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domains and this is held in a Shared MIB and this is shared across the Domain of the
Network and the Domain of the Gateway.
3.3 Data Streams
a.
USER SERVICE FUNCTIONS AND DATA STREAMS
b.
RESIDENTIAL GATEWAY FUNCTIONS
c.
NETWORK TERMINATION FUNCTIONS
NETWORK DOMAIN
DOMAIN OF RESIDENTIAL
GATEWAY STANDARD
Diagram 2.5: - Data Streams and Terminations
For any data stream transmitted or received at a Network Interface there are typically
three components.
a.
The User Services path, consisting of user data, and service control and
configuration signals, extends through i) the Access Network card to the
backplane of the RG, and from there to a home network, and ii) from the
Home Network card to the backplane of the RG, and from there to an access
network.. Note that this stream does not pass through the cards unchanged;
it may, in fact, undergo significant processing by the protocol translation
function of the cards.
b.
The Residential Gateway path penetrates to the GIP domain, the region that
contains the backplane interface and the shared MIB; this allows i) the
network OSS, and ii) the Home Network Management System, each to
interact with the RG functions themselves.
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c.
On the Wide Area side of the Residential Gateway, the Wide Area Network
line termination signals (the bottom path) penetrate only into the Wide Area
Network domain of the card, where the access line termination functions
reside. This region contains the access network transceiver, the
microprocessor and associated access network software, and the private
access network MIB that contains data that are accessible only to the network
OSS.
d.
On the Local Area side of the Residential Gateway, the Local Area Network
line termination signals (the bottom path) penetrate only into the Local Area
Network domain of the card, where the home network line termination
functions reside. This region contains the home network transceiver, the
microprocessor and associated access network software, and the private
home network MIB that contains data that are accessible only to the home
network’s Network Management system.
4. Standardised Components of Gateway
A conforming Residential Gateway may include one or more of the components
described in this subclause.
Diagram 2.6 depicts the components of this subclause.
4.1 Components of Gateway
DOMAIN OF RESIDENTIAL
GATEWAY STANDARD
WAN
WGI
RGIP
LGI
LAN
Diagram 2.6: Components of Residential Gateway

WGI - WAN Gateway Interface

HGIP - HomeGate Internal Protocol

LGI - LAN Gateway Interface
These components may be realised as:

separate, physical modules (such as Network Interface Cards attached to an intelligent
backplane, the HGIP)
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
Firmware or software modules (such as might be found in an integral single box Residential
Gateway)

subsets using some or all modules realised physically or logically (in software or firmware)
Details of Components
4.1.1 WAN Gateway Interface (WGI)
The WAN Gateway Interface (WGI) consists of the following parts:

A Specific WAN Interface part (SWI) which conforms to the standards and requirements for
connection to that wide area network. This part of the WGI presents the network with an
interface or network termination which conforms to the standards of that Network 3 The
information which is WAN specific may be stored in a WAN specific private MIB.

A Processing and Protocol Conversion (PPC) part. This part of the WGI ensures that signals
and data from the HGIP are converted to the correct format for transmission to systems in the
Wide Area over the communication channel which the SWI has opened4 and vice versa. The
PPC will require information about the address(es) of the data it is handling, the addresses
and their characteristics in the Wide Area and how these relate to objects in the LAN and their
addresses. This information needs to be stored in a shared MIB

A HGIP Interface part (RI). This is an interface common to all modules which interface to the
HGIP. It ensures that all signals between the WGI and the HGIP are presented to the HGIP in
the correct manner for the HGIP Interface. It also needs to know which other modules are
attached to the HGIP and which signals should be routed to and from these other modules via
the HGIP. This information needs to be stored in a private HGIP MIB.
HGIP Common HGIP Common
Addressing
Data Format
HGIP
Common
I/F
HGIP
Private MIB
DOMAIN OF RESIDENTIAL
GATEWAY STANDARD
RGI
LAN Specific
Data Format
DATA
PATH
SHARED
MIB
PROCESSING AND
PROTOCOL CONVERSION
PPC
LAN Specific
Addressing
Specific
LAN
Interface
LAN Specific
Private MIB
LOCAL AREA
NETWORK DOMAIN
SLI
Diagram 2.7 : WGI with sub elements and functions
3
For instance if the network were a telephone network, the interface would present the correct voltage and loop conditions
for the network to determine that the interface was on or off hook. Then, the interface would present the correct tones for
dialling and receive the correct electrical and audio information to determine the state of connection. It would detect
other equipment going off hook and act accordingly and would return the line to an on hood condition at the close of
communication
4
An example of this would be a modem converting packets of data from a device on a LAN to Audio modulations for
transmission over a telephone network, or to suitable packets for transmission over a digital link.
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4.1.2 LAN Gateway Interface (LGI)
The LAN Gateway Interface (LGI) consists of the following components:

A HGIP Interface part (RI). This is an interface common to all modules which interface to the
HGIP. It ensures that all signals between the LGI and the HGIP are presented to the HGIP in
the correct manner for the GGIP Interface. It also needs to know which other modules are
attached to the HGIP and which signals should be routed to and from these other modules via
the HGIP. This information needs to be stored in a private HGIP MIB.

A Processing and Protocol Conversion (PPC) part. This part of the LGI ensures that signals
and data from the HGIP are converted to the correct format for transmission to systems in the
Wide Area over the communication channel which the SWI has opened 5 and vice versa. The
PPC will require information about the objects in the LAN, their addresses and characteristics
in the Local Area and how these relate to systems and objects in the WAN and their
addresses. This information needs to be stored in a shared MIB

A Specific LAN Interface part (SLI) which conforms to the standards and requirements for
connection to that local area network. This part of the LGI presents the local network with an
interface or network termination which conforms to the standards of that Network 6 The
WAN Specific WAN Specific
Addressing
Data Format
Specific
WAN
Interface
WAN Specific
Private MIB
LOCAL AREA
NETWORK DOMAIN
SWI
HGIP Common HGIP Common
Data Format
Addressing
HGIP
Common
I/F
DATA
PATH
SHARED
MIB
HGIP
Private MIB
PROCESSING AND
PROTOCOL CONVERSION
PPC
DOMAIN OF RESIDENTIAL
GATEWAY STANDARD
RGI
information which is LAN specific may be stored in a LAN specific private MIB
Diagram 2.8 : LGI with sub elements and functions
It will be noted that the functions of the LGI and WGI are similar and in many ways
symmetric.
5
An example of this would be a transceiver converting packets of data from a system on a WAN to electrical modulations
for transmission over a power line carrier network or to suitable packets for transmission over a digital radio link.
6
For instance if the network were a PLC network, the interface would receive and act on signals which were addressed to
its node on the network. Then, the interface would broadcast the signal onto the PLC network with the address of a
device attached to the network, having first ascertained that there was no traffic already on the network. It would
determine if the network device was ready to accept data and carry out suitable handshaking to set up dialogue between
the device, the HGIP and devices or systems linked to other modules attached to the HGIP
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4.1.3 HomeGate Internal Protocol (HGIP)
The HomeGate Internal Protocol shall consist of the following elements:

Common Interfaces to the HGIP

A standard set of functions for the operation of the HGIP

A standard protocol (commands, addressing, etc,) for invoking the functions

A mechanism for routing data between WGI and LGI modules (and optionally between LGI
modules)

Management processes to control the activity of the HGIP and of modules attached to it.

Security Mechanisms to prevent unauthorised access or egress of data to or from the
premises and to implement other security functions
MANAGEMENT
PROCESSES
HGIP
Common
I/F
PROCESSES
PRIORITY
SECURITY
HGIP
Common
I/F
HGIP
Common
I/F
HomeGate Internal Protocol
GATEWAY INTERNAL
DATA TRANSFER ARCHITECTURE
ADDRESSING
HomeGate Internal Protocol
ROUTING
HGIP
Common
I/F
HGIP
Common
I/F
HGIP
Common
I/F
Diagram 2.9 : GIP with sub elements 7
7
Note: the HGIP may function in the Residential Gateway at a number of levels. The level illustrated below is the fully
specified modular version and may be realised in hardware, firmware and software. Subsets of this version are allowable
where the HGIP is realised in firmware or software alone or even where there is direct connection between elements of
WGI and LGI
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4.2 Structural implementations of RG
The RG may be realised in a variety of implementations, ranging from: a simple 1:1
integral box implementation to a many WAN to many LAN modular realisation and
may interface to any Local Area Network such as Ethernet, IEEE1394 or any of several
Home Busses
It is intended that the RG standard shall be modular and that elements such as the WGI
and LGI can be merged (as in the case of a simple WAN-to-LAN gateway) and that
elements can be selected as required as the complexity of the gateway increases.
Wherever elements are explicitly interfaced, they and their interfaces shall conform to
the protocols, addressing and data formats specified in the standard.
Some examples of gateway implementations are given below8.
4.2.1 Simple Gateway Example (informative)
In the "Simple" implementation example, the gateway is a 1:1, WAN:LAN configuration.
To conform to this Standard for Residential Gateways, only the elements for Security
(Part 2 of this Standard) and Interoperability (Part 3 of this Standard) must be compliant.
This configuration may include additional connection and interfacing specifications that
are outside the domain of the Residential Gateway Standard. This type of gateway may
use the paradigm of the GIP and have internal interfaces to the GIP which shall conform
to the requirements of this standard. This configuration is shown in Diagram 2.10.
PSTN
RESIDENTIAL
GATEWAY
EHS/EIB
HOME NETWORK
WIDE AREA
COMMUNICATION
NETWORKS
SWI
RESIDENTIAL
GATEWAY
SLI
SWI - Specific WAN Interface
SLI - Specific LAN Interface
Diagram 2.10 : The simple 1:1 implementation of a Residential Gateway
4.2.2 Complex Integral Gateway Example (informative)
8
Note Where a GIP is directly connected to one or more additional GIPs (case b.) the multiple GIPs must function as if they
were a single GIP
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In the Complex Integral implementation of the gateway one or more WANs or one or
more LANs interface to the Residential Gateway. The Gateway is a "one box" device but
it may have three or more interfaces. To conform to this standard for Residential
Gateways, this configuration must comply with the requirements for Interoperability and
security and must utilise the GIP. Also, this configuration shall implement processes to
adapt the data and addresses of the WANs to which it interfaces for presentation to the
GIP and similarly for the LANs to which it interfaces. Instances of this Residential
Gateway Configuration will be Set Top Boxes delivering Satellite DTV or cable TV with
Interactive Applications such as Video on Demand, DSL Adaptors and Cable modems
and certain proprietary Gateways. This configuration is shown in Diagram 2.11.
EHS/EIB
PSTN
WIDE AREA
HOME NETWORK
RESIDENTIAL
GATEWAY
SATV
IEEE1394a
IEEE1394a FireWire
STB
DTV
COMMUNICATION
NETWORKS
SWI
RESIDENTIAL
GATEWAY
DVCR
SLI
SWI - Specific WAN Interface
SLI - Specific LAN Interface
GIP - Gateway Internal Protocol
GIP
SWI
SLI
Diagram 2.11 : The Complex Integral Gateway Configuration
4.2.3 The Complex Modular Gateway Example (informative)
The Complex Modular implementation of the Residential Gateway enables flexibility in
the functions of the gateway and the services it can offer. In this configuration "plug-in"
interface modules sit between the Network and the Gateway Internal Data Transfer
Architecture and interface to the GIP. In this implementation, the gateway and its
modules shall comply with the requirements for Security and Interoperability specified in
Parts 2 and 3 of this Standard for Residential Gateways. Additionally, the modules shall
be compliant with the physical and logical GIP interface(s) specified by this standard and
present their data flows in the correct format at both the network interfaces and to the
GIP interface. Each Module shall carry out Processes to adapt Data and Protocols as
described in section 3.1.2 and interface with the GIP as specified in Parts 5,6,7... of this
Standard for Residential Gateways.
Note: It is anticipated that there will be overlap between the Complex Modular
configuration and the Complex Integral configuration where designers wish to utilise
particular WANs but interface to multiple LANs. This configuration is shown in Diagram
2.12
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PSTN
WGI
LGI
EHS/EIB
SATV
WGI
LGI
IEEE1394a
HOME NETWORK
STB
DTV
IEEE1394a FireWire
DVCR
RESIDENTIAL
GATEWAY
WGI
Processes to Adapt
SWI
LGI
Processes to Adapt
GI
GI
GI
GI
GI
GI
GI
GI
GI
GI
GI
GI
Data/Protocols
Processes to Adapt
SWI
SWI - Specific WAN Interface
SLI - Specific LAN Interface
GIP - Gateway Internal Protocol
GI - GIP Interface
WGI - WAN to Gateway Interface
LGI - LAN to Gateway Interface
Data/Protocols
Data/Protocols
SLI
Processes to Adapt
Data/Protocols
SLI
Diagram 2.12 : The Complex Modular Residential Gateway configuration
4.2.4 Distributed Gateways Example (informative)
More than one Residential Gateway unit may be installed in a premise. This Standard
requires that the behaviour of Residential Gateway units compliant with this standard
shall be the equivalent of a single complex gateway. Also, a conforming RG must be
capable of complying with the requirements of Interoperability and Security as specified
in Parts 2 and 3 of this Standard. In addition to the requirements for the Residential
Gateways described in sections 3.3.4.1 to 3.3.4.3, Gateways in a distributed
configuration shall function as if their GIP were a contiguous element with routing and
addressing between LANs and WANs equivalent to a single Residential Gateway. Some
potential configurations of distributed gateways are shown in Diagrams 2.13, 2.14 and
2.15.
There are three generic ways in which the GIPs of Residential Gateways may be linked
to form a distributed gateway.
a. The Link may be implemented on the LAN side and can use the Home Network
or Higher Speed Networks such as ISO 8802.3 or IEEE1394.
b. The Link may be implemented directly from the GIP of one RG to the GIP of a
second RG. In this case, the Gateway Internal Data Transfer Architecture shall
be the same for both RGs and be an extension of the bus (or other
architecture) type used.
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c.
The Link may be implemented over the WAN and may be a high speed IP link
between two "always on" devices - for instance a cable modem for one RG and
a xDSL modem for the other.
Note: there may be two or more distributed gateways in any premise(s).
ISO8802.3
PSTN
xDSL/CABLE
RG
#1
EHS/EIB
HOME NETWORK
ISO 8802.3
PC
SATV
RG
#2
ISO 8802.3
IEEE1394a
IEEE1394a FireWire
STB
DTV
DVCR
100BaseT EtherNet LAN
Diagram 2.13 - Distributed Gateways linked over the LAN
PSTN
RG
#1
EHS/EIB
HOME NETWORK
xDSL/CABLE
PC
SATV
RG
#2
IEEE1394a
STB
DTV
IEEE1394a FireWire
DVCR
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Diagram 2.14 - Distributed Gateways linked directly
PSTN
xDSL
RG
#1
EHS/EIB
HOME NETWORK
PC
CABLE
SATV
RG
#2
IEEE1394a
STB
DTV
IEEE1394a FireWire
VCR
Diagram 2.15 - Distributed Gateways linked via the Wide Area Network.
5. HomeGate Software Functional Requirements
 Language translation
 Firewall (security, privacy) providing bi-directional protection
 Encoding agreement between resident & service provider
 Limit service provider from going beyond the service agreement with the
provider
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Wide Area Networks
HomeGate
Home Networks
HomeGate Functions
WAN
Interfaces
Home
Translation Firewall Encoding/ Network
Decoding Interfaces
Figure 1 – HomeGate Functions
5.1 Essential Terminology
5.1.1 HES
HES (Home Electronic System) is defined as a home network (LAN) system that
conforms to the HES reference models and architecture describing common structures
between home networks including protocols and application languages for home
networks. In the HES model, Home LANS can be comprised of three classes of service:
 Class 1 – Control services (e.g., control, monitoring, measurement, alarm or low
speed data).
 Class 2 – Medium bandwidth data (information) services (e.g., voice telephony,
baby monitor, etc.).
 Class 3 – High bandwidth data (information) services (e.g., computer data,
video, high speed isochronous data, etc.).
An HES Class 1 is the most basic service and provides a signaling system for Class 2
and Class 3 services. For instance, HES Class 1 might serve stand alone functions
such as lighting control, energy management, security monitoring, and also manage
signaling paths for Class 2 and Class 3 services. Managing a signal path would include
resource allocation (i.e., channel allocation, address assignment, etc.), start, stop, and
network management. In summary, HES Class 1 is a signaling overlay network or
backbone for basic home control functions and for supporting HES Class 2 and Class 3
services.
5.1.2 CONTROL CHANNEL—HES Class 1
Control information or data information may be carried on the Class 1 control channel.
Control information is information that is meaningful to the home control network
operation. Data information is program material or other high volume data that has no
meaning to the HES network but is being transparently passed to some information
appliance on the HES for display or interpretation by specific application devices.
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5.1.3 DATA CHANNEL—HES Class 2 or Class 3
5.1.4 WAN
Wide Area Network is a term used here to denote any external network service
(originating outside the home or premises) and under the control of external service
providers. A WAN might employ a wide range of protocols and services such as cable
television, conventional switched voice telephony (PSTN), ISDN telephony and data
services, electric power, DBS (Direct Broadcast) satellite, broadcast radio or television,
internet access (perhaps via xDSL or cable), MMDS or any number of newly emerging
broadband consumer services.
5.1.5 LAN
Local Area Network is a term used here to denote any internal home network service
(originating inside the home or premises) and under the control of the resident or
applications installed in the residence under the authority of the resident. A LAN might
employ a wide range of protocols, services and products such as television recievers or
other video products, conventional voice telephony (POTS) devices, ISDN telephones
and data devices, electric power devices, home comptuers, internet access appliances,
and home control or automation devices (e.g., lighting controls, security systems,
thermostats, HVAC systems, metering devices and domestic appliances).
5.1.6 HomeGate
A gateway is an interface between two dissimilar networks and operates on OSI layer 7
(application layer), in contrast to Bridges (OSI layer 2) and Routers (OSI layer 3).
HomeGate is a standardized residential gateway between any number of home
networks (one of which may be an HES premises network) and any number of WANs.
HomeGate performs such functions as WAN termination, protocol translation, resource
arbitration, firewall security and privacy assurance.
6. HomeGate Software Architecture
6.1 Summary
A generalized HomeGate architectural model is shown in Figure 2. Note that the home
control channel illustrated may operate on multiple media that are interconnected via
routers. The primary controlling element of the HomeGate model is the HESA (HES
Agent). Other elements are the WASA (WAN Service Agent), the HODC (Home Data
Channel) and the LASC (LAN Application Specific Controller). The HESA
communicates with the WASA, the HODC and the LASC using a special HES Gateway
Meta Language (HGIP).
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HES
Class 1
decvice
HES
Class 2, 3
decvice
LASC
LEAD
LEAD
LAN
application
specific
controller
LAN
application
device
LAN
application
device
LAN protocol stack
LAN protocol stack
HomeGate
HomeGate
Internal Protocol
HGIP
HESA
(control path)
HES
Agent
(data path)
WASA
Home
Data
Channel
(optional)
HES LAN
Class 1
HES LANs
Class 2, 3
(control
channel)
LAN protocol stack
Security/
Decoder
Module(s)
LAN protocol stack
LAN protocol stack
WAN protocol stack
WANs
HODC
(optional
path)
LAN
stack
protocolstack
HESprotocol
WAN
channel
Service
Agent
HGIP
(data
channels)
Figure 2 – HomeGate Software Generalized Architectural Model
6.2 HESA
The HESA monitors the activity on the HES control channel (HES Class 1) and on the
WANs. The HESA translates and arbitrates processes between them according to
application-specific procedures. A HomeGate has only one HESA. The HESA passes
information directly between the WAN and the LAN or directs the transfer of information
between the WAN and the LAN data channels (HES Class 2 or 3). The HESA
communicates with the WASA, the HODC and the LASC using a set of HGIP service
primitives (e.g., READ, WRITE, INDICATE, CONFIRM, REQUEST, RESPONSE, etc.) to
initiate or respond to service requests or needs originating either from the WAN or from
the LAN.
6.3 WASA
The WASA is the application riding above the application layer (layer 7) of a WAN
protocol stack that is connected at its lowest layer to the physical WAN medium. A
dedicated WASA resides in the HomeGate for each specific WAN connection.
Therefore, a typical HomeGate may consist of several WASAs, one for each WAN
protocol or service (or service provider). The service specific WASA receives and
initiates messages or data flow between the HomeGate and the WAN. The WASA
passes control information or data to the HESA and data only to the HODC. The WASA
may physically reside on a plug-in module in the HomeGate.
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6.4 LASC
The LASC is an LAN application specific process controller. The LASC knows about the
capabilities of various HEADs (LAN Application Devices) residing somewhere on the
LAN network. The LASC communicates with the HESA and with HEADs. The LASC
serves as an application manager. The LASC also knows or learns about the
capabilities of WAN services relevant to the LASC application and initiates or responds
to service requests from either WAN services or LAN devices (HEADs). The LASC may
physically reside on a plug-in module or may reside elsewhere on the LAN network. If
the LASC is co-located with the HomeGate, it may communicate directly with the HESA
using HGIP. If the LASC resides elsewhere, it must communicate with the HESA by
tunneling HGIP constructs to the HESA via the LAN Class 1 protocol. The LASC could
also be co-located with a LEAD.
6.5 HODC
The HODC is a data channel/medium-specific application riding above the application
layer (layer 7) of a home network protocol stack that is connected at its lowest layer to
the physical LAN data channel medium. An HODC resides in the HomeGate for each
home network data channel/medium. In particular, there will be an HODC for each LAN
(Class 2 or 3) data channel/medium. The HODC is entirely under the control of the
HESA using HGIP. The HODC sends or receives data from an appropriate WASA as
directed by the HESA. The HODC is not under control of any WASA, since all HODC
operations must be negotiated through the HESA. The HODC may physically reside on
a plug in module in the HomeGate.
6.6 Security Decoder
Optionally, one or more security decoder agents (modules) can be attached to the
HODC for decoding or decryption of the incoming WAN data stream for such
applications as might require it. A security decoder agent module may also provide
encoding or encryption of an outgoing LAN data stream or may manage firewall
functions or enforce various other security policies within the HomeGate architecture.
The security decoder agent operates under control of the HESA although it may contain
functions, codes or algorithms not accessible (i.e., readable or modifiable) outside of
itself.
6.7 HGIP
The HGIP is a special HomeGate control language that consists of a defined set of
service primitives, a set of objects and a syntax. It is used to monitor activity on the LAN
and on the WAN and to exercise control of the WASA, the HODC, the security/decoder
module and the LASC.
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7. HomeGate Applications
A home may be equipped with one or more HomeGate units. The HomeGate units can
interconnect via a home network control channel (e.g., the HES Class 1) and share all of
the network media in the home. The HESA is equipped with arbitration
features/protocols to avoid conflicts. In cases where more than one HomeGate unit is
installed, a specific LASC must be associated with only one HomeGate, which is
accomplished during the installation/configuration process.
WASAs are WAN service-specific (i.e., medium or service provider specific) and can be
supplied by WAN service providers. LASCs and HODCs are LAN media-specific and
can be supplied by WAN service providers or by home LEAD appliance providers. The
HESA and the HomeGate unit(s) can be provided independently. A typical physical
model of the HomeGate is shown in Figure 3.
Smartphone
Feature Package
Gateway
Processor
Audio Access
Feature Package
AT M card
Energy Saver
Feature Package
ISDN card
Security Feature
Package
WAN Network Terminations
Customer Plug-in Feature Package Modules
Cable A card
Wireless card
HomeGate Unit
Service
Port
Home Network Interfaces
Other Wired Powerline
Media
T wisted
Pair
Wireless
Media
Figure 3 – HomeGate Physical Illustrative Model
(Description of physical model and comparison with architectural model—to be supplied.
Description of typical application examples—to be supplied).
8. Privacy and Firewall Functions
The HESA is the primary control element of the HomeGate. Some privacy, security and firewall
functions of the HomeGate are embedded in the HESA or provided for by the architecture of the
HomeGate, but since many such functions are application-specific, they are embedded in the
LASC and/or the security/decoder module. In some cases, functions such as decoding,
compression or decompression, and conditional access may be incorporated into the
security/decoder module or may need to be embedded, at least partially, in the actual LEAD.
This approach is consistent with other standards currently under development, such as set-back
boxes, renewable security and digital television.
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PART 2
System Components
1. Language and Addressing for Residential Gateway
In order to ensure compatibility between all devices and Residential Gateways, a short
set of standardised commands, addresses and APIs is defined by this standard. These
enable the Gateway Internal Bus to direct information, data and voice efficiently between
networks interfaced to the Residential Gateway.
1.1.1 Addressing
1.1.2 Commands
1.1.3 APIs
T
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PART 3 - Network Interoperability
1. Network Interoperability for the Residential Gateway
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PART 4 - Security, Privacy & Safety
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Part 7 - Common Bus and Internal Protocol for Residential Gateways - CardBus
PART 6 - Common Interface and Internal Protocol
for PCI Bus Residential Gateway
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for Residential Gateways - Card Bus
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