CETTM MTNL

1Leased Line & MLLN

LEASED LINES & MLLN

MODULE ID: TLMAMLN110

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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)

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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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Types of leased circuits

Speech circuit, Hot line or P/W

TP circuit

Tickler circuit

Data circuits.

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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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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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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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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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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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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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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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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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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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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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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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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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Vmux / Access Switch

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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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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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