Download OPTICAL ACCESS NETWORK

PENGENALAN NGN
Sekolah Tinggi Teknologi Telkom
2007
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Latar Belakang Kehadiran Softswitch
Jaringan yang ideal adalah jaringan full packet (mulai dari tingkat
access hingga core network), terintegrasi (PSTN, PLMN, data),
multi service dengan protokol open standard, multi vendor dan
mudah dikembangkan. Jaringan ini dikenal sebagai NGN (Next
Generation Network)
Untuk menuju NGN, pembangunan gerbang-gerbang VoIP
dianggap solusi yang bersifat parsial (tambal sulam) karena tidak
dirancang untuk jangka panjang (long term) dalam tahapan
evolusi/migrasi menuju NGN
Teknologi baru sebagai pengembangan VoIP yang dirancang
mampu mengawal menuju NGN, baik secara smooth (bertahap)
maupun radikal adalah teknologi softswitch.
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Mengapa Softswitch ?
Berikut adalah beberapa kelemahan mendasar dalam elemen
switch pada jaringan circuit switched (TDM), yang kemudian
diperbaiki oleh teknologi softswitch
Circuit-Switched
P
R
O
P
I
E
T
A
R
Y
vs
Service &
Applications
Services, Applications & Features
(Management, Provisioning and
Back Office)
Open
Call Control &
Switching
Transpotrt
Hardware
Protocols
Protocols
APIs
Softswitch Call Control
Open
· Solutions come from a single vendor
that supplied everythingin one
proprietary box : software, hardware
and applications
· Customer were locked – in to their
vendor – no room for innovation,
expensive to implement and maintain
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Soft-Switched
Protocols
Protocols
APIs
Transport Hardware
· Solutions come from multiple
vendors, at a levels who supply
open standards – based products
· Customer are free to choose bestin-class product to build their
network. Open standards enable
innovationand reduce costs
3
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Overview
• Definisi (Sun Microsystem)
The precise definition of a Softswitch is somewhat controversial due
to its numerous service offerings and implementation options.
Here is one general definition:
The Softswitch is a collection of products, protocols, and
applications that enable any device to access
telecommunication and/or Internet services over an IP
network.
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Overview
• Softswitch technology enables connectivity between the
Internet, wireless networks, cable networks and the
traditional telephone networks.
• The network convergence that can be achieved using
Softswitch.
• Softswitch enables the Telephone network to
communicate with the internet world, and vice versa.
• The scheme of connectivity, directory numbering system
and billing mechanism of the telephony world is made
available to other networks (including the internet) using
Softswitch.
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• The traditional telephone network uses Class 5 and Class 4
circuit switches along with Time Division Multiplexing (TDM)
technology to transport voice data. It also uses the SS7
signaling network to handle call setup and teardown, plus
other functions.
• The traditional telephone network is integrated with the IP
network by using certain Softswitch components, including
Media Gateways (which move voice data between dissimilar
networks) and Signaling Gateways (which move call
signaling data between dissimilar networks).
• Typically, a privately managed IP network is used to handle
voice data.
• A privately managed IP network is similar to the public
Internet, except it provides a higher quality of service for
voice data, and is usually implemented with IP over ATM
technology.
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• The International Softswitch Consortium (ISC) is a body represented
by various technology leaders, telecommunication equipment
manufacturers, ITU and IETF. ISC views Softswitch as a collection of
technologies (not a specific product) that enable next generation
telecommunication services based on open standards.
• This is quite different from the traditional model where services, call
control and transport hardware are proprietary.
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Tipe Koneksi Panggilan
• The telephone network follows the 10 digit numbering plan in the US,
while the IP network uses naming conventions like [email protected].
• Some of the types of call connections that Softswitches can support, for
example :
•From a telephone to another telephone. Both the calling party and the
caller is part of the Public Switched Telephone Network (PSTN).
•From an IP telephone or a multimedia computer to a (PSTN)
telephone. For example, [email protected] might call 925-555-9360.
This call traverses the IP network as well as the PSTN, and might be
made with an Internet application such as Net2Phone. In such cases
the IP network connects to the PSTN using gateways.
•From a multimedia computer or IP telephone to a multimedia computer
For example, [email protected] might call a [email protected].
This call remains within the IP networks, and might be made with
applications such as NetMeeting, Internet Chat, or Instant Message. In
this case the (PSTN) Telephone network is not used
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Tipe Koneksi Panggilan
– From a video conferencing terminal to a regular telephone
or a wireless phone.
– From a PC to a two-way pager or a WAP-capable wireless
phone.
• There are many other possible types of call connections or
message delivery mechanisms supported by Softswitch
technologies.
• In the IP network, the Signaling information is carried over the
TCP/IP for its reliable delivery, and the digitized voice is
carried over UDP/IP for its delivery with low overhead.
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Komponen Softswitch
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Komponen Utama
A Softswitch can consist of one or more of these components.These
functions can reside in one system or span across several systems. The
later chapters in this paper will look at implementation decisions in more
detail.
1. The Gateway Controller is one of the key functional units of the
Softswitch. The Gateway Controller holds the call processing rules, but
uses the Media Gateway and Signaling Gateway to perform the job. It is
the responsibility of the Signaling Gateway to perform call set-up and
teardown. In addition, it interfaces to the OSS and BSS systems. Often
this unit is referred as Call Agent or Media Gateway Controller
interchangeably. Sometimes the Call Agent by itself is referred as a
Softswitch. This component communicates within other parts of the
Softswitch and also the external networks using different protocols.
2. The Signaling Gateway serves as the gateway between the SS7
Signaling network and the nodes managed by the Softswitch in the IP
network. A Signaling Gateway requires physical connectivity to the SS7
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network and must be aware of the required protocol suites.
Komponen Utama
• 3. The Media Gateway handles the voice media data payload (the digitized
samples of speech during conversation). In the future, video data will also
need to be supported. In the current model, the Media Gateway must support
connectivity to a TDM bus carrying voice media data to the Telco switch side.
Applicable voice data encoding, decoding, and compression are also
performed by the Media Gateway. It also supports legacy telephony (PSTN)
interfaces and protocols such as CAS and ISDN.
• 4. The Media Server performs peripheral functions, to enrich the Softswitch
with media capabilities. If required, it supports digital signal processing (DSP)
resources. If IVR functionality is needed (eg: to prompt voice responses), those
tasks would be performed by the Media Server. Video Media also would be
served by a Media Server when applicable.
• 5. The Feature Server provides all the revenue generating features and
services such as billing, multi-party conferencing, etc. The Feature Server uses
the resources and related services located on other components of the
Softswitch. It may also support certain services to meet certain
implementation necessity e.g.: GateKeeper.
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Contoh implementasi softswitch
Softswitch Implementation
Configuration
oss
Softswitch
SGW
SS7
Aplication Server
Residential
Green Field
HFC
Packet Network
AGW (CMTS)
MSC
•xDSL
•FTTB
CDMA
AGW
(xDSL/
IAD)
AGW (CGW)
TGW
PSTN
Internet
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Summary
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•
•
•
•
•
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NGN
Jaringan VoIP
PLMN
ISDN
ATM
Jaringan IP
IN
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