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CETTM MTNL
1Leased Line & MLLN
LEASED LINES & MLLN
MODULE ID: TLMAMLN110
CETTM MTNL
2Leased Line & MLLN
Content
Introduction Type of the Leased Line General structure of Leased Line Modems Leased Lines problem and troubleshooting MLLN MLLN architecture and componant Types of NTU Network management System (NMS)
CETTM MTNL
3Leased Line & MLLN
Switch TrunkLine
LeasedLine
A leased circuit is a dedicated link provided between two fixed locations for exclusive use of customer
Leased Circuits
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4Leased Line & MLLN
Types of leased circuits
Speech circuit, Hot line or P/W
TP circuit
Tickler circuit
Data circuits.
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5Leased Line & MLLN
Used to transport digital signals
This is an error free communication link
between two digital devices.
Data circuits
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Types of data circuits on the basis of connectivity 2 wire circuit 4 wire circuit
Speed of the data circuit is measured in terms of Bits per second (BPS) i.e. 2.4 K , 4.8 K, 9.6 K . Etc. 64 K 128 K . 2 Mb.
Data circuits
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Components of leased circuit
Customer Premises Modem
Network side Modem
Multiplexers
Transmission media
Physical Connectors
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8Leased Line & MLLN
DTEDTE DCE DCE DTE
RS 232 C RS232 CTRANSMISSION MEDIA
DTE ; Data Terminating Equipment i.e.
Computer or I/O device.
DCE : Data Connecting Equipment i.e. Modem
General structure of Data Circuit.
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General Structure of Data Circuit
Most of the leased circuits modems offer bandwidth or speed in multiples of 64K
On copper the highest speed that user can get is about 2.048 Mbps
Most popular modems use DSL( Digital Subscriber line) technology to connect to nearest exchange
DSL technology typically supports 4 Kms at 2 Mbps it uses 2B-1Q encoding
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Leased Line Connectivity
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Transmission Media
Physical cable pair. PCM OFC Satellite Microwave Sub Marine cable Choice of media depends on environmental
conditions.
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Modem is a device which converts digital signal to analogue and analogue signal to digital
Hence modem is also called DAD digital-analogue-digital converter.
Modem
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Functions of the modem
DAD conversion
Transmission and reception
Error detection and correction
Detect equipment / transmission failure
Hand shaking
Initiate call and automatic answer to I/c call
Voice/Data capabilities.
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14Leased Line & MLLN
Most popular interface on the network side is G-703 interface
For 64 Kbps it is known as G 703 Co-directional
Above 64 Kbps it is known as G 703 interface On network side these modems are connected
to multiplexers, which consolidate the data into streams of E1 lines for easy transmission
Network Side Modem
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Leased Line Troubleshooting
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16Leased Line & MLLN
Leased Line Troubleshooting
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Leased Line Problems
New circuit provisioning
Failure of circuit
Fixed bandwidth
No monitoring of circuit
No quick rerouting
Records of faults
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What is MLLN ?
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MLLN (Managed Leased Line Network)
Fully managed Access Network
End to end control
Guarantee of uptime
QoS, SLA .
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MLLN
This is an integrated, fully managed,
multiservice digital network platform through
which service provider can offer a wide range
of services at low cost.
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Features of MLLN
More Reliable. End to end circuit creation Circuit loop test and fault isolation Alternate re-routing of traffic Modems will be provided by service provider 24 hrs. performance monitoring Bandwidth On demand Long drive on single Copper pair Centrally managed from Network
Management System (NMS)
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DACC
DACC
DACC
V-MUX
V-MUX NTU
NTU
MLLN Network
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Key Elements of MLLN
MLLN Nodes
DXC (Digital Cross-Connect)
VMUX (Versatile Multiplexer)
NTU (Network Terminating Unit)
NMS (Network Management System)
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MLLN Structure
Three tier structure :
Central Node
Second stage node
Third stage node
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MLLN-NOC Architecture
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MLLN Modem (NTU)
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Types of MLLN Modems
STU-160:- 64-128 kbps
STU-2304, STU-2048,CTU-S:- for 2 Mbps
CTU-512:- 64 to 512 Kbps
CTU-R:- Modem + Router upto 2Mbps
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MLLN Modem (NTU)
HDSL - standard compliant + much more CTU-512
max 512 kbps Otherwise the same functionality as CTU-S One DTE access interface, X.21 or V.35
CTU-s 64-4554kbps High capacity One DTE x.21, v.35, g.703 Fully managed
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30Leased Line & MLLN
Integrated Solution CTU-R
Integrated solution decreases both capital & operational expenses
CTU-S
CTU-R
V.35
10/100 Eth.10/100 Eth.
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31Leased Line & MLLN
NTU -Vmux Connectivity
GC
2/4W
2W
2/4W
642Mbps
642112 kbit/s
1.2128 kbit/s
CTU - 512
CTU-S
CTU-R
MLLN Network
Remote NMS Management
VMUX
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32Leased Line & MLLN
Indication STU-160 NTU
Digital carrier detect.Green109
106
105
104
103
Symbol
Green
Green
Green
Green
Color
Ready for sending
Request to send
Receive Data
Transmit Data
Function
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33Leased Line & MLLN
Indication STU-160 Modem
PWR
RA
LA
ERR
142
Green
Yellow
Red
Red
Yellow
Power ON.
Remote Alarm
Local Alarm
Error on line
NTU in Test Mode
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34Leased Line & MLLN
POWER
DMA
PMA
Line 1
Symbol
Green
Yellow
Red
Green
color
Power ON
Defer Maintenance alarm
Prompt Maintenance alarm
Line is active
Function
CTU-512 Modem
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35Leased Line & MLLN
STM 1 POSInterfaceSTM 1 POSInterface
STM-1 SDH System
POSInterface
DDF
MLLN MUX
NTU NTU
MLLN MUX
DDF
STM-1 SDH System
MPLS Cloud
OFC OFC
Leased line through OFC
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36Leased Line & MLLN
Leased Line on MLLN
DP
Pillar
Sakinaka
Local MDF
VMUX
PCMRoom
Sakinaka
DACC
DACC
BKC DACC
VMUXin
PCMRoom
BKC Local MDF
PillarDP
NTU
NTU
CLIENT
SERVER
2 Mb Cu
2 Mb Cu
STM
STM
STM
Copper
Copper
On Copper
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37Leased Line & MLLN
64/128kbps (V.35)
Customer Premises
MLLN MODEM
VMUX
PC 2
MODEM
ROUTER
Switch
PC 1
ROUTER
Local MTNL Exchange
Ethernet
Ethernet
G.703 (2Mbps)
Cu Wire (HDSL Interface)
Internet
Internet Node
Internet Leased Line Circuit
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38Leased Line & MLLN
Vmux / Access Switch
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39Leased Line & MLLN
Power Requirement V-MUX
VMUX operates on 48 Volt DC. Power requirement for each VMUX sub rack = 5
Amp Max. Each sub rack power supply unit receives 48
Volts through individual MCB placed at the top rear of the rack.
VMUXs operating on 230 Volt AC should be provided with un-interrupted 230 Volts supply.
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40Leased Line & MLLN
Transmission Equipment
Due to heavy demand for the leased circuits, service providers have started using
equipment known as Managed Leased Line Network
These are specialized transmission equipment meant for carrying leased line data only and uses the existing telecommunication backbone for hauling data over long distance
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Features beneficial to the customers
Customers need not to buy modems 24 hours performance monitoring of the circuit Circuit fault reports generated proactively On demand bandwidth can be increased Low lead-time for new circuit provisioning Protection against the failure of the circuit Long drive on single pair copper Centrally managed from NMS
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Features beneficial to the customers
MLLN also supports enhanced features such as Corporate Internet Access, Point-to-point Data, Point to multipoint data. LAN-IC, Hotline, EPABX Inter-connect, EPABX Remote Extension and ISDN Line Extension, Virtual Private Network etc.
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Advantages to Service Provider
Statistics on an end-to-end status Proactively detect a fault Automatic re-routing of traffic ensures both
customer satisfaction and also prevent a likely loss of revenue
The negotiable bandwidth during the different time of the day
Bandwidth on demand Software Programmable
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Network Management System The NMS of MLLN is centrally managing all
the elements of MLLN e.g. DACC, VMUX and NTU
The NMS shall allow the Network operator to configure, Provision, manage and monitor all aspects and parameters of the remote elements of MLLN without the need of local intervention
Failure of the NMS shall not result in loss of any network service
It provides Network Status Display using any standard graphical facility to view the network
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NMS Login Menu
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Network View
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Circuit Loop Test
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Leased lines are important mode of connectivity for data various application
The MLLN is an integrated, fully managed, multi-service digital network platform .
It is backed by a flexible NMS with powerful diagnostics & maintenance tools.
It is planned in three tier structure with NMS as central node, DACC layer as second stage node, V-mux layer as third stage node.
MLLN offers service with 24*7 monitoring & management
Summary
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