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10/10/2004 9. DSL, CM, SONET - Lin 1 CPET/ECET 355 9. High Speed Access Digital: DSL, Cable Modem, SONET Data Communications and Networking Fall 2004 Professor.

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Presentation on theme: "10/10/2004 9. DSL, CM, SONET - Lin 1 CPET/ECET 355 9. High Speed Access Digital: DSL, Cable Modem, SONET Data Communications and Networking Fall 2004 Professor."— Presentation transcript:

1 10/10/2004 9. DSL, CM, SONET - Lin 1 CPET/ECET 355 9. High Speed Access Digital: DSL, Cable Modem, SONET Data Communications and Networking Fall 2004 Professor Paul I-Hai Lin Electrical and Computer Engineering Technology Indiana University-Purdue University Fort Wayne www.ecet.ipfw.edu/~lin

2 10/10/2004 9. DSL, CM, SONET - Lin 2 High-Speed Access: DSL, Cable Modem and SONET 1.DSL (Digital Subscriber Line) Technology ADSL (Asymmetric) Discrete Multitone Modulation SDSL (Symmetric) HDSL (High-bit rate DSL) 2.Cable Modem CATV (cable) HFC (Hybrid Fiber Coax) Network DOCSIS (Data over Cable System Interface Specification) 3.SONET SONET devices SONET Frame and Rates

3 10/10/2004 9. DSL, CM, SONET - Lin 3 DSL Technology DSL Categories –ADSL (Asymmetric) –SDSL (Symmetric) –HDSL (High-bit rate DSL) –VDSL (Very-high bit rate DSL)

4 10/10/2004 9. DSL, CM, SONET - Lin 4 DSL Technology Lowest 4 kHz for voice lines Twisted-pair local loop – up to 1.1 MHz Uses Discrete Multi-Tone Modulation (DMT, QAM + FDM) Upstream speed < Downstream speed Fast business users - 1.5 Mbps/512kbps Residential users – 512/64 Kbps –UTP wires – support BW up to 1.1 MHz –Upstream 30 kHz to * –Downstream * to 1.1 MHz Info: http://www.cisco.com/univercd/cc/td/doc/cisintwk/ito_doc/adsl. htm http://www.cisco.com/univercd/cc/td/doc/cisintwk/ito_doc/adsl. htm

5 10/10/2004 9. DSL, CM, SONET - Lin 5 Discrete Multitone Technique From p. 220, Figure 9.1 of Data Communications and Networking, Forouzan, McGrawHill

6 10/10/2004 9. DSL, CM, SONET - Lin 6 DSL Bandwidth Division From p. 221, Figure 9.2 of Data Communications and Networking, Forouzan, McGrawHill

7 10/10/2004 9. DSL, CM, SONET - Lin 7 Discrete Multitone Technique DMT – uses QAM and FDM Divide 1.104 MHz into 256 channels, each 4.312 KHz Channel 0 – Voice Channel 1-5 (Band Guard, unused) Channel 6 to 30 (24) –Upstream data –QAM – 15-bit/baud –Date rate: 24 x 4000 x 15 = 1.44 Mbps Channel 31 to 255 (225) –Downstream data –Data rate: 225 x 4000 x 15 = 13.4 Mbps Actual Bit Rate –Upstream: 64Kbps to 1 Mbps –Downstream: 500 Kbps to 8 Mbps

8 10/10/2004 9. DSL, CM, SONET - Lin 8 ADSL Modem From p. 222, Figure 9.3 of Data Communications and Networking, Forouzan, McGrawHill

9 10/10/2004 9. DSL, CM, SONET - Lin 9 DSL Access Multiplexer From p. 222, Figure 9.4 of Data Communications and Networking, Forouzan, McGrawHill

10 10/10/2004 9. DSL, CM, SONET - Lin 10 Other DSL Technologies SDSL (Symmetric DSL) –Business HDSL (High-bit-rate DSL) –Alternative to T1 (1.544 Mbps) –3.6 km VDSL (very-high-date-rate DSL) –300 to 1800 m –Downstream: 50 to 55 Mbps –Upstream: 1.5 to 2.5 Mbps

11 10/10/2004 9. DSL, CM, SONET - Lin 11 Cable Modem Community Antenna TV (CATV) Hybrid Fiber-Coax Network Bandwidth Data rates Cable Modem Cable Modem Transmission System Data Transmission Scheme

12 10/10/2004 9. DSL, CM, SONET - Lin 12 Traditional Cable TV Network From p. 223, Figure 9.5 of Data Communications and Networking, Forouzan, McGrawHill

13 10/10/2004 9. DSL, CM, SONET - Lin 13 Hybrid Fiber-Coax Network Fiber + Coax Regional Cable Head (400 K subscribers) Distribution Hub (40 K subscribers) Switch Fiber –Fiber Links –Fiber Nodes Coaxial Distribution (Drop cable – about 1000 subscribers) Data Streams –Upstream Fiber –Downstream Fiber

14 10/10/2004 9. DSL, CM, SONET - Lin 14 HFC Network From p. 224, Figure 9.6 of Data Communications and Networking, Forouzan, McGrawHill

15 10/10/2004 9. DSL, CM, SONET - Lin 15 Cable TV Bandwidth Allocation From p. 225, Figure 9.7 of Data Communications and Networking, Forouzan, McGrawHill

16 10/10/2004 9. DSL, CM, SONET - Lin 16 Cable TV Bandwidth Allocation From p. 225, Figure 9.7 of Data Communications and Networking, Forouzan, McGrawHill Data Upstream: –5 MHz to 42 MHz (6 channels, 6 MHz/channel) –12 Mbps (2-bit/Hz QPSK x 6MHz) –TDM sharing among neighborhood Analog TV Bands: 54 MHz to 500 MHz (80 ch x 6 MHz/ch) Digital video and Data Downstream –550 MHz to 750 MHz (180 channels) –64-QAM (6-bit, 5-bit/Hz x 6MHz = 30 Mbps)

17 10/10/2004 9. DSL, CM, SONET - Lin 17 Cable Modem From p. 227, Figure 9.8 of Data Communications and Networking, Forouzan, McGrawHill

18 10/10/2004 9. DSL, CM, SONET - Lin 18 Cable Modem Transmission System From p. 227, Figure 9.9 of Data Communications and Networking, Forouzan, McGrawHill

19 10/10/2004 9. DSL, CM, SONET - Lin 19 Data Over Cable System Interface Specification (DOCSIS) 1. The CM checks the downstream channels (sent by the CMTS) 2. The CMTS allocate up/down BW for the CM 3. The CM determines the distance between the CM and CMTS – synchronization, minislots (TDM) 4. The CM asking for Internet addresses 5. The CM and CMTS establish the security parameters 6. The CM sends its ID to CMTS 7. Upstream communication begin

20 10/10/2004 9. DSL, CM, SONET - Lin 20 3. SONET Two Standards –ANSI - Synchronous Optical Network –ITU-T standard – Synchronous Digital Hierarchy (SDH) Features –Synchronous network: A single clock (timing), data frame, multiplexed Fiber-optics transmission system (FOTS) standard Physical design – carrying signals from incompatible systems (DS0 and DS-1) –TDM system

21 10/10/2004 9. DSL, CM, SONET - Lin 21 SONET Devices Synchronous Transport Signal (STS) Multiplexer/Demultiplexer Regenerator (repeater) Add/Drop Multiplexers

22 10/10/2004 9. DSL, CM, SONET - Lin 22 A SONET From p. 229, Figure 9.10 of Data Communications and Networking, Forouzan, McGrawHill

23 10/10/2004 9. DSL, CM, SONET - Lin 23 SONET Frame From p. 230, Figure 9.11 of Data Communications and Networking, Forouzan, McGrawHill

24 10/10/2004 9. DSL, CM, SONET - Lin 24 SONET Frame A frame –Total 810 octets = 9 rows x 90 octets per row –Administrative overhead 27 octets = 3 columns x 9 rows –The first 2 bytes: alignment byes (F628), begin a frame –Synchronous Payload Envelop (SPE) Transmission overhead User data

25 10/10/2004 9. DSL, CM, SONET - Lin 25 SONET Rates STS (Sync. Transport Signals) Levels –STS-1 to STS-192 –Physical link called Optical Carriers (OCs) STS-1 (OC-1) –8000 frames/sec –810 octets per frame –Raw rate = 8000 x 9 x 90 x 8 = 51.84 Mbps –SPE rate = 8000 x 9 x 87 x 8 = 50.12 Mbps –User rate = 8000 x 9 x 86 x 8 = 49.536 Mbps

26 10/10/2004 9. DSL, CM, SONET - Lin 26 Table SONET Rates STSOCRate (Mbps)SPE (Mbps)User (Mbps) STS-1OC-151.8450.1249.536 STS-3OC-3155.52150.336148.608 STS-9OC-9466.56451.008445.824 STS-12OC-12622.08601.344594.432 STS-18OC-18933.12902.016891.648 STS-24OC-241244.161202.6881188.864 STS-36OC-361866.231804.0321783.296 STS-48OC-482488.322405.3762377.728 STS-192OC-1929953.289621.6049510.912 From p. 231, Table 9.1 of Data Communications and Networking, Forouzan, McGrawHill

27 10/10/2004 9. DSL, CM, SONET - Lin 27 Virtual Tributaries A particular payload that can be inserted into a frame and combined with other payloads to fill out the frame VT1.5 accommodates DS-1 (1.544 Mbps) VT2 – European CPET-1 (2.048 Mbps) VT3 – DS-1C (3.152 Mbps) VT6 – DS-2 (6.312 Mbps)

28 10/10/2004 9. DSL, CM, SONET - Lin 28 Virtual Tributaries Types From p. 232, Figure 9.13 of Data Communications and Networking, Forouzan, McGrawHill

29 10/10/2004 9. DSL, CM, SONET - Lin 29 Higher-Rate Services From p. 232, Figure 9.14 of Data Communications and Networking, Forouzan, McGrawHill

30 10/10/2004 9. DSL, CM, SONET - Lin 30 Summary Questions?

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