Mtnl Project Summer

8/8/2019 Mtnl Project Summer

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Name -ParveshName -ParveshChopraChopra

Branch -E.C.EBranch -E.C.E


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History of mtnlHistory of mtnl

MTNL (Mahanagar Telephone NigamMTNL (Mahanagar Telephone NigamLtd.)Ltd.)

Was constituted in year 1986Was constituted in year 1986 Previously it was a governmentPreviously it was a government

organization under the department oforganization under the department oftelecommunicationtelecommunication


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1986 2010YEARS

MILLIONS

EQUIPPED CAPACITY AND

SUBSCRIBER BASE(MILLIONS)


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Services provided byServices provided by

mtnlmtnlCell connection of gsm dolphin postpaidCell connection of gsm dolphin postpaidCellular connection of gsm trump prepaidCellular connection of gsm trump prepaidWll ( cdma) garuda-fwWll ( cdma) garuda-fw

Wll cdma garuda mobileWll cdma garuda mobileInternet servicesInternet servicesDsl (distributed subscriber line) broadbandDsl (distributed subscriber line) broadband

internet Tribandinternet TribandVpn (virtual private network) through bsnl and vsnlVpn (virtual private network) through bsnl and vsnl


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Services by mtnlServices by mtnl Customer careCustomer care

Billing assistanceBilling assistance

1661 services dial and get fortnightly meter reading1661 services dial and get fortnightly meter reading Payment through pay-in-slips mtnl, delhi has launched a scheme for the benefit ofPayment through pay-in-slips mtnl, delhi has launched a scheme for the benefit of

customers for payment of telephone bills through pay-in-slips.customers for payment of telephone bills through pay-in-slips.

Customer care centreCustomer care centre

Network of customer service centres for single window solutionNetwork of customer service centres for single window solution

Sanchar haats (telemarts) for instant connectivity and shopping experience.Sanchar haats (telemarts) for instant connectivity and shopping experience.

Customer service management system(csms)Customer service management system(csms)

Interactive voice response system ( ivrs)Interactive voice response system ( ivrs) Online directory enquiry serviceOnline directory enquiry service


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.

Integrated services digital networkIntegrated services digital network

HotlineHotline

Call forwarding /call transferCall forwarding /call transfer BroadbandBroadband

Telephone servicesTelephone services

I-NetI-Net


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TelephonicTelephonicCommunicationCommunication

Telephony is a branch of line communication thatTelephony is a branch of line communication thatdeals with the transmission of spoken messages.deals with the transmission of spoken messages.

Parts of telephonic communicationParts of telephonic communication

Telephone:- A telephone is a device thatTelephone:- A telephone is a device thattransmits and receives speech at a distancetransmits and receives speech at a distance

Telephone Transmitter:- It is a transducerTelephone Transmitter:- It is a transducerconverting sound energy into electrical energyconverting sound energy into electrical energy

Telephone Receiver:- This does the reverseTelephone Receiver:- This does the reversefunction of transmitterfunction of transmitter


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Networking DevicesNetworking Devices Hub:- A Hub is device that controls the traffic to theHub:- A Hub is device that controls the traffic to the

network, not every device plugs into the central hub.network, not every device plugs into the central hub.

Modem:- Modem is device that is used to convert digitalModem:- Modem is device that is used to convert digitalsignal generated by computer into an analog signal to besignal generated by computer into an analog signal to becarried by a public access phone line.carried by a public access phone line.Types of modem:Types of modem:

-external modem-external modem

-internal modem-internal modem-PC card modem-PC card modemRouter:- An internet is a interconnection of individualRouter:- An internet is a interconnection of individual

networks. To create an internet , we neednetworks. To create an internet , we needinterconnecting devices called routers and gatewaysinterconnecting devices called routers and gateways


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HUB

HUB

HUB

HUB


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TELEPHONE

NETWORK

SWITCHING

STATION

SWITCHING

STATION

MODULATOR

DEMODULATOR

MODULATOR

DEMODULATOR

M O D E M

M O D E M


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ROUTER

ROUTER

RING

RING


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Subscriber LineSubscriber Line

ConfigurationConfiguration Outdoor partOutdoor part

TelephoneTelephone

Distribution pointDistribution point

CabinetCabinet

Indoor PartIndoor Part

Main distribution frameMain distribution frame

Switch roomSwitch room


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TELE

PHONE

D.P. CABINET

MDF

SWITCH ROOM

A

B

S


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5 ESS5 ESSSWITCHSWITCH


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5 ESS SWITCH5 ESS SWITCH

5 ESS Stand for fifth generation electronic5 ESS Stand for fifth generation electronicswitching system.switching system.

The 5ESS Switch is a digital exchange that canThe 5ESS Switch is a digital exchange that can

serve as a local (lines), toll (trunks), tandemserve as a local (lines), toll (trunks), tandem(lines and trunks) or international gateway(lines and trunks) or international gatewayexchange depending upon the type of switch.exchange depending upon the type of switch.

The 5ESS Switch is most flexible digitalThe 5ESS Switch is most flexible digitalexchange for use in the Global Switchingexchange for use in the Global Switching

Network.Network.


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HARDWAREHARDWARE The 5ESS Switch hardware is dividedThe 5ESS Switch hardware is dividedinto three major types of equipmentinto three major types of equipmentmodules with each of them involved inmodules with each of them involved in

varying degrees in setting up and tearingvarying degrees in setting up and tearingdown of every call:down of every call:

Switching moduleSwitching module

Communication moduleCommunication moduleAdministrative moduleAdministrative module


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Features of 5 ESSFeatures of 5 ESS

SwitchSwitch High reliabilityHigh reliability Multiple applicationsMultiple applications

Modular designModular design Market leadershipMarket leadership

WirelessWireless


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APPLICATIONAPPLICATION Local ExchangeLocal Exchange Toll ExchangeToll Exchange

Gateway ExchangeGateway Exchange

Operator service position systemOperator service position system Integrated services digital networkIntegrated services digital network

Signalling transfer pointSignalling transfer point

Services switching pointServices switching point

Mobile switching centerMobile switching center


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E.W.S.D (Electronische Wheler

Systeme Digitale).1.Manufactured by siemens(Germany)2.This is for Intelligent Network and Mobile

communication.

3.This is switch which can support maximum2,50000 subscriber outgoing or both waytrunks.

4.It can supports CCS no7,ISDN and INand V5.x features.


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.

DIGITAL LINE UNIT (D.L.U)

LINE/TRUNK GROUP

SWITCHING NETWORK

COORDINATION PROCESSOR COMMON CHENNEL NETWORK SIGNALING

CONTROL (CCNC)UNIT OR SIGNALING SYSTEMNETWORK CONTROL (SSNC).


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DLU

DLUCC

LTG

GP

LTG

GP

Common channel signaling/ Signaling System Network

Control

CCNC/SSNC

Access

Coordination

CP

SYPSYPC

MBMBC

CCG

EM

OMTSGC

Switching Network

Distributed controls in EWSD


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.

It is a functional unit on which subscriber linesare terminated.

DLUs are connected to EWSD subsystem via auniform interface standardized by CCITT i.e.

PDC. One DLU is connected to two different LTGs for

the resion of security via two MBPS links. Total 124 channels are available between a DLU

out of which two LTGs signaling information iscarried in TS16 of PDC0 and PDC2.


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.

PDC3 without ccs

PDC2 with ccs

PDC1 without ccs

PDC0 with ccs

Subscriber lines and PBX

lines for small and med-

ium-sized PBXsRemote

application

Local

application

4Mbps

SNLTG

LTG

CP

4 MbpsDLU

DLU

Subscriber lines and PBX

lines for small and

medium-sized PBXs

CCITT standard

interface G.703Remote application :in same directory number area,

in another directory number area,

as extension to conventional exchange.

Applications and connection of Digital Line Unit


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. MAIN COMPONENTS OF DLU

SLMAs and / or SLMDs Two Digital Interface Units for DLU (DIUD)

for

connections of the PDCs. Two DLU Controls (DLUC) Two 4 Mbps networks for the transmission

of user information between SLMs and the

DIUDs.


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.

Test Unit (TU), External Alarm module (ALEX)

Alarm modules. one DLU can carry traffic of 100 enlarge For emergency service DLU Controller (DLUC) always

contain upto date subscriber data Test Unit (TU), External Alarm module (ALEX)

Alarm modules. one DLU can carry traffic of 100 enlarge For emergency service DLU Controller (DLUC) always

contain upto date subscriber data


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.

.

DLU

Test line

DIUD0

DLUC1

DIUD1

DLUC0

PDC1

PDC0

PDC2

PDC3

to

two

LTGs

SLMA

SLMD

Test

4096 kbps network 04096 kbps network 1

Control network 0

Control network 1

TU

Analog

and ISDN

Subscriber

lines, PBX

lines

Main Components of a DLU


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.

Call processing functions receiving and

analyzing line and register signals.

Safeguarding functions detecting errors inthe LTG and on transmission paths withinLTG.

Operation and maintenance functions acquiring traffic data, carrying out quality-to-

service measurements.


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.

FUNCTIONAL UNITS OF THE LINE/TRUNK GROUPS

Line / Trunk Unit (LTU) :- Digital Interface unit(DIU30) for connection of 2 Mbps digital trunks and either

DLU or PA.

Code Receivers (CR) are Multi-frequency code receivers for

trunks or DTMF subscribers. Conference Unit, module B or module C (COUB or COUC)for conference calls. This is installed in special function

LTGMs or LTGNs.

trunks and Tone Generators (TOG) during routine tests.

This is installed in special function LTGMs or LTGNs

Automatic Test Equipment for Trunks (ATE:N) checks.


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.

Tone Generator (TOG) for audible tones.

Code Receivers (CR) for MFC signalling and push-

button dialling.

Receiver Module for Continuity Check (RM:CTC), etc.

Group Switch (GS) :- which functions as non-blocking time stage switch

(512 TS) controlled by the GP.

Link Interface Unit (LIU) :-

connects LTG to SN via two parallel 8 Mbps SDCs.

SU :-UNIT SIGNALING


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controls the functional units of the

LTG. The received signals from LTU, SU, GS

and LIU are

processed with the help of GPsoftware.

GROUP PROCESSOR (GP)

:-


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.SWITCHING NETWORKS

Different peripheral units of EWSD, i.e., LTGs, CCNC, MB

are connected to the Switching Network (SN) .

Through 8192 kbps highways called SDCs (Secondary

Digital Carriers), which have 128 channels each.

It consists of several duplicated Time Stage Groups (TSG) and Space Stage Groups (SSG) housed in separate racks.

Connection paths through the TSGs and SSGs are switched

by the SGC.

Each TSG can accommodate 63 SDCs from LTGs and one

Documents

Mtnl Project Summer