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E2-E3
E&WS
MLLN
For internal circulation of BSNLonly
WELCOME
• This is a presentation for the E2-E3 E & WS
• Module for the Topic: MLLN
• Eligibility: Those who have got the Upgradation to from
E2 to E3.
• This presentation is last updated on 18-3-2011.
• You can also visit the Digital library of BSNL to see this
topic.
For internal circulation of BSNLonly
AGENDA
 Introduction of Leased line
 Over view of MLLN Network
 MLLN Architecture
 Conventional Leased Line
 TVARIT System
For internal circulation of BSNLonly
Leased Line – Introduction
1. A leased circuit is a dedicated link provided
between two fixed locations for exclusive use of
the customer.
2. It is a dedicated point to point line connecting
the facilities of a Customer for telephone sets,
EPABX,Computers, etc. or for forming a VPN.
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Need for Leased Line
• Connecting geographically spread out
locations.
• Dedicated transmission.
• Security.
• Ease of communication.
• Stand by arrangement.
• Networking.
• Interconnection.
For internal circulation of BSNLonly
IMPORTANTANCEOFLEASEDLINES
• Leased circuit provides us high revenue.
• Leased circuits serve very important needs of
customers.
• Expectations of customers are very high.
They need high Q.O.S. & want to sign SLAs.
• In the changing economic environment
dependence of activities on leased circuits is
increasing.
• Due to emerging competition rates are bound
to go further down with many more new
features.
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What is MLLN
• MLLN Stands for Managed Leased Line
Network.
• MLLN is a Fully Managed Access Network,
which allows the operator to keep an end-to end
• control over the customer circuit and hence
provide him guarantees of uptime of the circuit
(QoS, SLA’s).
• MLLN is a Next generation Digital Access
Network which provides solutions to all the
• Data networking and Voice requirements of the
customer.
• MLLN is an Overlay network realized through
Tellabs Networking Elements, which
• offer Multiple Value-added and customized
services to the customers.
For internal circulation of BSNLonly
Segments Addressed by MLLN
• Managed Bandwidth Leased Lines to Alternate
Service Providers.
• Paging ,VAS , Cellular, ISP & Value added
Service Providers.
• Virtual Private Network (VPN).
• Stock exchanges, Banks, MNCs, Publishing
Houses, Software Developers, Broadcasting
companies.
• Multi-Service Network for Governance
applications , State Wide Networks.
• Enhanced support for legacy applications
Hotlines, PABX-IC, Point to Multi-point circuits,
ISDN Service extension, Data circuit for Security
& Travel applications
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Tellabs 8100 Network Elements
All elements managed end-to-end by one system:
the Tellabs 8100 network manager
Tellabs 8130
micro node
Tellabs 8110 NTU
Tellabs 8120
mini node
Tellabs 8160
accelerator node A111
Tellabs 8140
midi node
Tellabs 8150
basic node
Tellabs 8170 cluster node
MLLN ARCHITECTURE
• MLLN Elements
• DXC (Digital Cross-Connect)
• VMUX (Versatile Multiplexer)
• NTU (Network Terminating Unit)
• NMS (Network Management System)
• (Centralized NMS for the whole network having
main NMS site at Bangalore and the Disaster
Recovery(DR) site at Pune)
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Cluster Node(DXC)
• DXC
• In Master and Slave Configuration
• Modular DACC - 32 to 256 E1’s
• Full management from NMS
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Basic Node(VMUX)
• VMUX
• 3 Types of V-MUX
V-MUX Type-1, V-MUX Type-2 &
V-MUX Type-3 (AC/DC Power)
• Built-in HDSL modem interfaces
• Full management from NMS
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Features of MLLN elements
• NTU
• Wide range
• HDSL Network interfaces
• Different types of CPE interfaces
• Long drive on copper (7 km)
• Full management from NMS
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NMS
• NMS
• Best in the industry
• User friendly GUI
• Open & redundant architecture
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BSNL MLLN NETWORK
• Covering around 600 cities nationwide
• 3 tier architecture of DXCs
• Core network of regional DXCs (R-DXCs) at
Mumbai, Delhi, Kolkatta and Chennai and Sub
Regional (SR-DXCs) at various locations in the
four maintenance regions
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BSNL MLLN NETWORK
• Mesh connectivity between R-DXCs
• Mesh connectivity between SR-DXCs of
the same region.
• All SR-DXCs connected to R-DXCs.
• Major SSAs have been provided with SS
DXCs.
• Remote Operator Terminal (ROT) planned
for every station having more than 30
leased circuits.
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DIGITAL CROSS CONNECT (DXC)
Features of DXC
Capacity
DXC (64 ports upgradeable to 128 ports)
DXC (96 ports upgradeable to 128 ports)
DXC (128 ports upgradeable to 256 ports)
DXC (256 ports)
• I/0 cross-connect capability
• Non-Blocking Architecture
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DIGITAL CROSS CONNECT (DXC)
• Redundancy
Power Supply
Switching Matrix
Cross-connect Memory
• Expansion to be made possible by addition
of cards only
• Fully Managed from Centralized NMS
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Tellabs 8170 DXC
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VERSATILE MULTIPLEXER (VMUX)
Types of VMUX
Cards
V-MUX Type-IA
(PFUA-1,OMH-5 ,QMH- 2,XCG-1)
V-MUX Type-IIA
(PFUA-1,OMH-2,XCG-1)
V-MUX Type-IIIA (PUA/PFUA-1,OMH-2,XCG-1)
230V AC Powered
-48V DC Powered
Expansion to be made possible on the same
chassis by addition of cards.
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VERSATILE MULTIPLEXER (VMUX)
• VMUX to be able to extend hotline circuits.
• Point to point and Point to Multi-point circuit
routing are possible.
•
HDSL Driving Distance:
3.5km at 2Mbps
5 km at 1Mbps
7km for 64/128kbps (at 0.5mm dia copper cable)
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VERSATILE MULTIPLEXER (VMUX)
V-MUX
Type
Initial Requirement
Nx
64kbp
s
VMUX Type 1A 40
VMUX Type 2
16
VMUX Type 3
AC/DC
16
Hot
line
E1
12
4
Expansion
Requirement
(Incremental)
E1
Nx
Hot
64kb line
ps
8
4
4
8
4
8
For internal circulation of BSNLonly
4
4
4
Tellabs 8150-VMUX TPYE-1A
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NETWORK TERMINATION UNIT (NTU)
Features of NTU
• Capacity
64/128kbps NTU with V.35 interface
64/128kbps NTU with G.703 interface
N x 64kbps NTU with V.35 interface
N x 64kbps NTU with G.703 interface
N x 64kbps NTU with Ethernet Interface
• Line Loop Testing as per ITU-T rec V.54
• NTU to send power off signal to the NMS at the
time of NTU getting switched off.
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Types of NTUs with different interfaces
• Tellabs 8110 STU-160/V.35 for 64/128 kbps NTU
with V.35 interface
• Tellabs 8110 STU-160/G.703 for 64/128 kbps NTU
with G.703 interface.
• STU-160 works up to 128kbps
• CTU-S and CTU-R works up to 2Mbps on a single
pair of copper
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Network Terminating Unit (NTU)
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NETWORK MANAGEMENT SYSTEM
• Features of NMS
• (Centralized NMS for the whole network having
main NMS site at Bangalore and the Disaster
Recovery(DR) site at Pune)
• MLLN NMS Billing and Accounting System
• Web Self-care system
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NETWORK MANAGEMENT SYSTEM
• MLLN NMS performs all the management functions on
the network
• Provides complete functionalities
• Supports regional partitioning and VPN capabilities
• Performance Monitoring, Recovery, Reporting Packages
For internal circulation of BSNLonly
Conventional Leased Circuits
• Upgradability :In steps 64K, 2M
• Monitoring :No
• Manageability :No
• Testing :Fault localization Lengthy (NFF)
• Coordination Problems :Fault in Modem/ Last mile
• Provisioning :Long (Patching)
• SLA :No
• Bandwidth on Demand :No
For internal circulation of BSNLonly
Leased Circuits on MLLN
• Upgradability :In N * 64K
• Monitoring :Yes
• Manageability :Yes
• Testing :Fault localization Faster
• Coordination :No Problem
(Both Modem/ Last mile of BSNL)
• Provisioning :Fast (Config.)
• SLA :Yes
• Bandwidth on Demand :Yes
For internal circulation of BSNLonly
MPLS VPN
• Upgradability :In n * 64K (even for non- MLLN)
• Monitoring :Yes (even for non- MLLN)
• Manageability :Yes
Testing :Fault localization Faster
(Monitoring by NOC even for Non- MLLN)
• Coordination :Depends on last mile (MLLN ?)
• Provisioning :Fast (Config.)
• SLA :Yes (even for non- MLLN)
• Bandwidth on Demand :Yes
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MPLS Vs MLLN
• MPLS
MLLN
• Security
Leased, 100%
• IP based
PPP
• QOS ,not 100%assured 100% available
• Shared
dedicated
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LEASED CIRCUIT MEDIA
• Leased circuits are available on
Optical Fiber Media
Radio Media
Copper Wire and
Satellite Media or a
Combination of these media
• Local media and national long distance media
are by the BSNL/MTNL and International Media
by VSNL
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TYPE OF LEASED CIRCUIT SERVICES
1. Speech Circuits (Hot Line or P-Wire) - Local or
Long distance circuits within a city or between
two different cities provided for the same
applicant. The terminating equipment at both
ends is telephone without dialing facility. Both
way signaling and speech is possible.
2. Data Circuits - Local or Long distance data
circuits at different speeds viz. 2.4Kbps,4.8Kbps,
9.6K bps, 64 kbps, nx64 kbps and 2 Mbps.
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TYPE OF LEASED CIRCUIT SERVICES
• Telegraph Circuits:- Local and Long distance
Tele- printer Circuits.
• International Leased Circuits:- Provided through
VSNL.
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TYPE OF LEASED CIRCUIT SERVICES
• Point-to-Point Data Circuits - Local and Long
distance.
• Private Data Network - More than one Local or
Long distance leased circuits.
• converging on a location such that data from one
leased circuit can be transferred automatically to
another leased circuit for the same subscriber.
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What is TVARIT ?
• TVARIT is Sanskrit word for the term “ IMMEDIATE”.
• TVARIT is “ LEASED LINE ONLINE ” provisioning
and upkeep system.
• It is computerized online system, simple to operate &
self explanatory.
• Paperless.
• Reliable, Fast and Instant execution of transactions.
• All the manual activities are computerized.
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NUMBERING SCHEME OF LEASED CIRCUIT
• Every leased circuit will have a number as
• ABCD/JKL/XY/EFGH
WHERE ABCD= originating SDCA code
EFGH= Terminating SDCA code
JKL = Circuit number
XY = Circuit type
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NUMBERING SCHEME OF LEASED CIRCUIT
• For circuit within the same
SDCA,ABCD=EFGH
• For 3 digit code, D= # and H= #
• For 2 digit code, C, D, = # and G, H = #
• For 3 digit SDCA code, for JKL = 000 to 999,
the circuit number will be
ABC#/JKL/XY/EFGH
For internal circulation of BSNLonly
NUMBERING SCHEME OF LEASED CIRCUIT
• For the circuit falling between 1000 to 1999 in SDCA with 2
digit code (i.e. JKL = 1000 to 1999),
• Value of D = * & C = # and the circuit number will become
AB#/*JKL/XY/EFGH
• For the circuit falling between 2000 to 2999 in SDCA with 2
digit code (i.e. JKL = 2000 to 2999),
• Value of C = * & D= * and the circuit number will become
AB/**JKL/XY/EFGH
For internal circulation of BSNLonly
XY codes of Tvarit
•
11
Speech circuit (with HOT line relay set)
•
12
Speech circuit (on PAX)
•
13
Speech-cum-data circuit
•
14
Voice grade data circuit
•
15
VFT
•
16
64 kbps circuit
•
17
N x 64 kbps circuits
•
18
2 Mbps circuit
•
19
8 Mbps circuit
•
20
34 Mbps circuit
•
21
140 Mbps circuit
For internal circulation of BSNLonly
XY codes Tvarit
• 22
STM-1
• 23
STM-4
• 24
STM-16
• 25
STM-64
• 26
R&G copper cable
• 27
R&G OFC cable
• 28
R&G UHF microwave
• 29
Contribution work copper cable
• 30
Contribution work OFC
• 31
Contribution work UHF microwave
• Any additional series code, (XY) will be centrally allotted
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HOW TO ACCESS TVARIT
• TVARIT is accessible by :
• PSTN DIAL-UP ( 022-22670080)
• ISDN DIAL-UP ( 022 –22639280 / 22639310 / 22639340 / 22639420)
• LEASED LINE ( 64 Kbps / 2 Mbps ) (LAN-WAN connectivity)
• Launch Internet explorer
• Write http://10.10.0.1/admin in the address bar
• The home page will be opened
• Enter valid username and password.
• Home page of the user will be opened.
• Carry out the required tasks by following the on-line menus
For internal circulation of BSNLonly
Key Features of TVARIT System
• Generation of the standard 13 digit unique number.
• Generation of the Provisional and final demand notes, Advice
notes, Receipts and other general feasibility and channel
allocation reports.
• Generation of Recurring bill.
• Generation of a full fledge Managerial Information Reports (MIS) .
• Current accurate status viewing to all the concern authorities.
• Address change and cancellation of the circuits
For internal circulation of BSNLonly
Thanks
For internal circulation of BSNLonly