Lecture3 Telephone Network

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Bi ging Mng Vin thông Lê Thị Thanh Huyền Bộ môn Thông tin Khoa Vô tuyn Đin t Email: [email protected] Phone: 0986603296

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Transcript of Lecture3 Telephone Network

  • Bai giangMang Vin thngL Th Thanh HuynB mn Thng tinKhoa V tuyn in tEmail: [email protected]: 0986603296

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  • Bai 3 Circuit-Switching NetworksCircuit SwitchesThe Telephone NetworkSignalingTraffic and Overload Control in Telephone NetworksCellular Telephone Networks

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  • Trn Xun Nam/HVKTQSMang chuyn mach KnhKnh danh ring gia 2 u khach hangKhach hang co th la ngi hoc thit bi (router or switch)Knh co th bao gm nhiu dang khac nhaung danh ring truyn dn dong inCac khe thi gian danh ring truyn cac mu thoaiCac khung danh ring truyn cac khung tin hiu Cac bc song danh ring truyn cac tin hiu quangCac mang chuyn mach knh yu cu:Ghep knh & chuyn mach cac knhBao hiu & iu khin thit lp cac knh

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  • Trn Xun Nam/HVKTQSS dung chuyn mach: Mt chuyn mach cung cp mang cho mt nhom ngi dung;Vi du: mt chuyn mach in thoai kt ni mt vung ni hat S dung chuyn mach kt hp ghep knh: Mt b ghep knh kt ni 2 mang Vi du: mt ng truyn tc cao kt ni 2 chuyn machAccess networkNetworkPhng phap phat trin mang

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  • Trn Xun Nam/HVKTQSMetropolitan network A co th xem nh mt mang Access SubnetworksNational network xem nh mang cua cac Regional Subnetworks (including A)ANational & InternationalNetwork of Regional Subnetworks(a)(b)AMang thanh ph1*acbd234Phng phap phat trin mangCac ngTc Cao

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  • Bi 3 Circuit-Switching NetworksThe Telephone Network

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  • Trn Xun Nam/HVKTQSMang in thoaiMang in thoai c thit lp cung cpTruyn dn tin hiu thoai analog real-time hai chiu qua cac thit bi chuyn mach va truyn dnKha nng truyn dn tin hiu s vi tc 45kbpsShannon capcity@40dB~41.2kbpsap ng c nhu cu truyn thng may tinh c ban Hoat ng trn c s chuyn mach knhMang in thoai ban uTao ng kt ni t mt may in thoai qua mang n mt may khacTai nguyn vt ly (dy, kt ni chuyn mach), c gianh ring cho cuc goi trong sut thi gianMang in thoai hin aiKt hp chuyn mach knh, truyn dn s va chuyn mach s

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  • Trn Xun Nam/HVKTQSTelephone CallBa giai oan cua truyn thng inh hng kt ni:Thit lp kt niNgi s dung yu cu kt niBao hiu mang thit lp kt niTrao i thng tinHi thoaiNgt kt niNgi dung t mayMang ngt tai nguyn kt ni

    Thit lp kt niNgt kt niHi thoai

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  • Trn Xun Nam/HVKTQS(a)12345ABCDinh tuyn Cuc goiCac cuc goi ni b, vi du, cung ti switch A, c ni qua mang ni hatNu hai user ni ti 2 switch khac nhau trong cung mang MAN, cn xac inh tuyn Cac cuc goi ng dai c ni ti nha cung cp dich vu ng daiLATA: Local Access & Transport AreasNha cung cp dich vu ng dai

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  • Trn Xun Nam/HVKTQSPhng tin truyn dnLocal Loop: Last Milei dy ng t in thoai ti COPedestal ti SAI ti Main Distribution Frame (MDF)2700 i cap trong si cap MDF niTin hiu thoai ti telephone switchDSL signal ni ti routers

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  • Trn Xun Nam/HVKTQSKt ni Hai & Bn dyT in thoai ti CO, hai dy mang tin hiu trn ca hai chiuBn trong mang, mi hng mt i dyCn chuyn i t 2-dy thanh 4-dy s dung hybrid transformer COCo th xay ra phan xa tin hiu tao nn ting vongEcho cancellers s dung tach tin hiu thoai khoi echoTwo WiresFour Wires

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  • Dial-up ModemTrn Xun Nam/HVKTQS

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  • Dial-up ModemTrn Xun Nam/HVKTQS

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  • V.32 & V.32bis StandardTrn Xun Nam/HVKTQSNDSLab Copyright@2008*32-QAM128-QAM7bits/baud

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  • Data Transmission in 56k modemTrn Xun Nam/HVKTQS

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  • Trn Xun Nam/HVKTQSADSL qua Local LoopADSL: Asymmetrical Digital Subscriber LineS dung ng dy thu bao kt ni tin hiu s khng i xng ti Internet POTS: Plain old telephone service26 kHz 108 kHz 138kHz

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  • Discrete Multi-tone Trn Xun Nam/HVKTQS

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  • ADSL Data TransmissionDiscrete multitone technique (DMT)Voice: Channel 0Idle: Channels 1-5 not used and provide a gap between voice and dataData: Channels 26-108 and 138-1104Upstream data and control (4kHz/channel)Channels 6 to 30 (25 channels) are used for upstreamOne channel is for control, and 24 channels are for data transferBandwidth: 24x4000x15 = 1.44 MbpsDownstream data and controlChannels 31 to 255 (225 channels)One channel is for control, and 224 channels are for data transferBandwidth: 224x4000x15 = 13.4 Mbps

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  • ADSL Modem and DSLAMTrn Xun Nam/HVKTQS

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  • ADSL standardsTrn Xun Nam/HVKTQS

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  • ADSL Local Loop ArchitectureTrn Xun Nam/HVKTQS

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  • ADSLATMAAL5PPPIPUpper layerProtocolsATMAAL5PPPIPUpper layer ProtocolsADSL Protocol ArchitectureDSL clientTelco COsessionmanagementInternetor outside n/w

  • Trn Xun Nam/HVKTQSFTTH hay FTTCFTTH: Fiber-to-the-Home: kt ni cap quang ti nha cung cp bng tn siu rng, nhng modem quang vn co gia thanh caoFTTC: Fiber-to-the-curb (hp u dy) vi khoang cach ngn t hp u dy (pedestal) ti nha co th cung cp tc cao qua i dy ng

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  • FTTH hay FTTCTrn Xun Nam/HVKTQS

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  • FTTxTrn Xun Nam/HVKTQS

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  • Traditional cable TV networkTrn Xun Nam/HVKTQSCommunication in the traditional cable TV network is unidirectional

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  • Hybrid networkTrn Xun Nam/HVKTQSCommunication in an HFC (Hybrid Fiber-Cable) cable TV network can be bidirectional

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  • Coaxial cable band by CATVTrn Xun Nam/HVKTQSDownstream data are modulated using the 64-QAM modulation technique.The theoretical downstream data rate is 30 Mbps.Upstream data are modulated using the QPSK modulation technique. The theoretical upstream data rate is 12 Mbps.

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  • Cable TV Connection DiagramTrn Xun Nam/HVKTQSCMTS: cable modem termination system

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  • Trn Xun Nam/HVKTQSBasic rate interface (BRI): 2B+DIntegrated Services Digital Network (ISDN)Primary rate interface (PRI): 23B+DMang cung cp kt ni s end-to-end u tininh nghia B channel = 64 kbps, D channel = 16 kbpsISDN xac inh giao tip ti mangMang gm cac mang con cho thoai, data, signalingD channel for signalling or access to packet network

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  • Bi 3 Circuit-Switching NetworksSignaling

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  • Trn Xun Nam/HVKTQSSignalingSignaling message cn thit thit lp cuc goiCo 2 loai bao hiuBao hiu gia ngi s dung va mangBao hiu trong mangSignaling message tao control signals xac inh cu hinh cua switchChi thi cho switch v trang thai ni u vao vi u ra

    Cn ca 2 thit lp kt ni

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  • Trn Xun Nam/HVKTQSThit lp Kt niNhn cngDo can thip cua con ngiMang in thoai cuCu lnh thoai do ngi goi noi Nhn vin tng ai thc hin kt ni

    T ngDo switch t ng thc hinYu cu kt ni tao signaling message gi n switchControl system iu khin thit lp kt ni switch

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  • Trn Xun Nam/HVKTQSStored-Program Control SwitchesSignaling message do ngi dung tao ra c a n switch qua ng dy va c ni n control system (SPC)SPC Crossbar switches (1960s)Chng trinh may tinh iu khin ong/m im ni thit lp kt ni gia cac u vao va u raBao hiu cn iu phi thit lp ng qua mang

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  • Trn Xun Nam/HVKTQSTrao i Signaling Message thc hin bao hiu trong mang, cac b x ly iu khin cac switches trao i ban tin bao hiu vi nhauCn co modems va ng dy ring truyn cac digital signaling qua cac ng trung k thoai gia cac b iu khin

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  • Trn Xun Nam/HVKTQSBao hiu Truy nhp Dial toneSTPSTPSTPSTPSSPSSPTransport NetworkSignaling NetworkSSP = service switching point (signal to message), STP = signal transfer point (packet switch)SCP = service control point (processing)Mang Bao hiu (1)Bao hiu kiu knh chung (Common Channel Signaling)Mang bao hiu c s dung kt ni cac b iu khin switch bng cach trao i cac signaling messageMang telephone network c chia thanh 2 mang: Signaling network: mang thng tin iu khin kt ni Transport network: mang thng tin ngi s dung

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  • Trn Xun Nam/HVKTQSBao hiu Truy nhp Dial toneSTPSTPSTPSTPSSPSSPTransport NetworkSignaling NetworkSSP = service switching point (signal to message), STP = signal transfer point (packet switch)SCP = service control point (processing)Mang Bao hiu (2)Truyn thng t ngi dung chia thanh 2 nhanh tai SSP:Control information: ti signaling network, khng ti ngi s dung do securityUser information: ti transport networkT chc mang bao hiu bng packet switching network, truyn thng tin dang packet gia cac node

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  • Trn Xun Nam/HVKTQSBao hiu Truy nhp Dial toneSTPSTPSTPSTPSSPSSPTransport NetworkSignaling NetworkSSP = service switching point (signal to message), STP = signal transfer point (packet switch)SCP = service control point (processing)Mang Bao hiu (3)T chc signaling network tin cy:Mi vung co 2 STP (packet switch)Cac STP c ni vi nhau kiu meshSCP co th bao gm database va cac b x ly c bitVD: goi DT bng credit cardBao hiu c chuyn n SCP, SCP yu cu nhp PIN, kim tra PIN vi database kt ni

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  • Trn Xun Nam/HVKTQSISUP = ISDN user partMTP = message transfer partSSCP = signaling connection control partTCAP = transaction capabilities partTUP = telephone user partB Giao thc H Bao hiu SS7SS7 network la mang packet iu khin thit lp, quan ly, ngt cac cuc goi mang PSTNH tr cho mang cellular, ISDNCo cu truc phn lp theo partMTP1: h tr cac tc : E1, T1, V.35/DS0 (64kbps), DS-0A(56kbps)MTP2: am bao truyn packets tin cyMTP3: phn phi message gia cac signaling points, routing and congestion control

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  • Trn Xun Nam/HVKTQSISUP = ISDN user partMTP = message transfer partSSCP = signaling connection control partTCAP = transaction capabilities partTUP = telephone user partB Giao thc H Bao hiu SS7ISUP: thc hin thit lp, quan ly, ngt cuc goiMt s nc s dung TUP thay cho ISUPMTP cho phep anh ia chi cac signaling pointSCCP cho phep anh ia chi cac ng dung tai cac signaling point qua dich vu connectionless or connection-oriented TCAP xac inh cac ban tin va giao thc gia cac ng dung s dung SS7 networks nh 1-800, calling card,TUP thay th ISUP mt s nc

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  • Cellular Network (3G)Trn Xun Nam/HVKTQS

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  • Cellular Network (LTE)Trn Xun Nam/HVKTQS

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