mtnl project summer
TRANSCRIPT
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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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5 ESS SWITCH5 ESS SWITCH
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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5 ESS SWITCH5 ESS SWITCH
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