Cable Modem網路系統

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燕乜
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1 ADSL Cable Modem T T T T

2 Cable World Cable Modem Cable Modem Cable Modem

5 Cable World- 110/220 V Electrical Signal 60/50 Hz Channel 2 55 MHz Satellite Frequency IF 5-54 MHz Microwave Above 1 GHz InfraRed Visible Light Ultra Violet X-Rays Gamma Rays What We Need MHz -Down Stream (DS) Cable company to subscriber DOCSIS => MHz,EuroDOCSIS => MHz RF Radio Frequency, : (ELF) (VLF 50-60Hz ) (LF) ( VHF UHF ) RF 300GHz (mm) -Up Stream (US) Subscriber to Cable company DOCSIS => 5-42 MHz,EuroDOCSIS => 5-65 MHz IF Internmediate Frequency,

6 Analog Video Program Digital Program/Data Amplitude dbmv 0-10 Pictures Color Subcarrier Sound Downstream QAM Data MHz / NTSC 6MHz / NTSC 6MHz / NTSC 8MHz / PAL,SECAM 8MHz / PAL,SECAM 8MHz / PAL,SECAM 3 Channels Frequency MHz

7 Std / IRC HRC( Std/IRC 1.25 MHz) Japan. Europe China. NTSC (6 MHz) PAL/SECAM (8 MHz) Harmonic Related Carrier (HRC) Incremental Related Carrier (IRC) or Standard (STD)

8 :

10 STS SDH

11 Cable Data Network Architecture

12 Regional Cable Headend

13 For Home PC CMTS Router Switch Content Data Base Proxy Server Application HFC Splitter HPF Cable Modem Data-interface (Ethernet / USB ) : connect the computer and the cable modem High Pass Filter (HPF)

14 Cable Modem-

15 BPI

29 Cable Modem Termination System(Cable Modem ),, Cable Modem. QAM (64QAM,256QAM) QAM (QPSK,16QAM) Packetizeing => MPEG2 Packet MAC Packet

30 DHCP Server TFTP Server Time Server

31 SNMP SNMP RFC 1157 SNMP UDP(,RFC 768) port 161 SNMP extension agent DLL MIBs( )

32 Cable Modem (1) - RF Cable Ethernet Cable Cable Modem Hub/Switch Ethernet Cable CPE : max 15 CMs PC1 PC2 PC3 PC4 PC5 PC14 PC15 IP assigned by DHCP Server at the head end CM => One IP CPE => 15 IPs at most. (Default CPE number = 1) CPE number is controlled by MSO.

33 (2) - RF Cable Cable Modem Ethernet Cable Router / NAT Hub/Switch #1 Hub/Switch #2 Hub/Switch #N Ethernet Wiring PC PC PC PC PC PC PC IP assigned by DHCP Server at the head end : CM => One IP Router => One IP (Default CPE number = 1)

36 CFGDNINT never turned on Attached TCP/IP interface to mac unit 1 Attaching network interface lo0... done. # :00: Lvl:7 OEM: OEM Descriptor v2 Found # :00: Lvl:2 Background Timer Set # :00: Lvl:7 OEM: USB set to 00:30:3b:00:23:5e # :00: Lvl:7 OEM: CMAC set to 00:30:3b:00:23:5d # :00: Lvl:7 OEM: Initialization complete # :00: Lvl:6 BPI Informational: AFSM State Changed to Start State NFS client support not included. usrnetinit Done # :00: Lvl:7 Slow Scanning Std/IRC Frequencies... # :00: Lvl:7 USB Interface is down # :00: Lvl:7 MAC Interface is up # :00: Lvl:7 USB Interface is up # :00: Lvl:7 Fast Scanning HRC Frequencies... # :00: Lvl:7 Slow Scanning HRC Frequencies... # :01: Lvl:7 Fast Scanning Std/IRC Frequencies... # :01: Lvl:7 Downstream Interface is up # :01: Lvl:7 Acquired D/S Freq: Mod: QAM 64 # :01: Lvl:7 Found UCD ID's: 1, 2, 3 # :01: Lvl:7 Upstream Interface is up # :01: Lvl:7 Starting DHCP # :02: Lvl:7 DHCP successful: CM IP: # :02: Lvl:7 Starting TOD at # :34: Lvl:7 TOD Successful: MON APR :34:36 # :34: Lvl:7 Starting Tftp Config File Get 'cm.bin' at # :34: Lvl:7 Config File Get Successful. # :34: Lvl:7 Performing check for boot-state based SWUpgrade. # :34: Lvl:7 Starting Registration with temp Sid: 4747 # :34: Lvl:7 Reg Rsp OK: Successful # :34: Lvl:7 Service Class: Id 1 SID 4747 # :34: Lvl:7 Max CPE set to 4 by config file # :34: Lvl:7 Snmp Cold Start Successful! # :34: Lvl:7 Performing check for post config-file based SWUpgrade. # :34: Lvl:7 *** CM Operational ***

37 HFC(Hybrid Fiber Coaxial ) 450MHz HFC 750MHz HFC Cable Modem CATV Cable Modem ( Cable Modem ADSL ISDN CM Refer

38 WHAT IS ADSL A D S L Asymmetric Digital Subscriber Line

39 ADSL 1 ADSL Web Browser Web Server

40 ADSL 2 cross-talk ADSL "A" Asymmetric:

41 ADSL

42 ADSL 1 ( Central Office) ADSL ADSL MODEM ADSL 1MHz ADSL 1MHz 4KHz 0-4KHz 4KHz POTS Splitter passive filter 1MHz 100KHz 1.1MHz 6 bits

43 ADSL 2 (CO) ATU-C ISP ADSL ATU-C 4 KHz POTS ADSL filter POTS, PC PC CO ATU-R 4 KHz POTS CO,POTS PC DSLAM ISP

44 ADSL QAM CAP DMT

45 WHAT IS QAM 1 QAM,,bit stream (orthogonal) (I&Q).,,.

46 WHAT IS QAM 2

47 WHAT IS CAP 1 CAP ADSL,1990 AT&T Bell Labs CAP (Carrierless Amplitude Phase ) AT&T (Down-stream)1.5Mbps (Upstream) 64kbps QAM Carrierless.

48 WHAT IS CAP 2 CAP. CAP ADSL, ADSL CAP

49 CAP 1. 6kft( 1.8km) 2. 4K HZ. 3.Up stream 25K Hz to 170K HZ 4.Down stream 200K Hz to 1.1M Hz 5. CAP FDM,.Up stream channel Down stream channel,.

50 DMT 1 Amati Communications DMT, 256 QAM 256

51 DMT 2 DMT Discrete Multi-Tone 100 KHz 1.1MHz 256 Sub channel 4KHz. ADSL ADSL ADSL ADSL 256 4KHz (15) 256 4K Mbps

52 DMT 3

53 DMT 4 DMT

54 DMT 5 1. CAP, DMT. 2.,.

55 DMT 6 1.DMT 256, K HZ 2.DMT DMT CAP QAM,,. 4. ( 26K Hz ) bit, S/N( )

56 DMT 7

57 DMT 1. DMT DMT DMT

58 ADSL MODEN ATU-C ATU-R DMT 30-45sec

59 WHAT IS DSLAM 1

60 WHAT IS DSLAM 2

61 WHAT IS DSLAM 3

62 WHAT IS DSLAM 4 DSLAM DSLAM CO,, ATM, ATM. DSLAM.

63 WHAT IS DSLAM 5 (LIM) (CM) Lucent DSLAM (TM) (LPM)

64 WHAT IS DSLAM 6 : LIM TM, ATM :, ATM. : ATU-C, ATU-C, ATM CM. : LIM.

Chap2.ppt

Chap2.ppt 2! PSTN Internet 2/ 73 ! 2/ 73 twisted pair! 8 UTP100 m Cat310 MbpsCat5100 Mbps 2/ 73 ! 2/ 73 ! 50Ω 50Ω 75Ω 75Ω 75Ω 2/ 73 ! 2/ 73 ! 2 km 10 km 2/ 73 ! 2/ 73 ! 2/ 73 ! ! f(hz) 10 0 10 2 10 4 10 6 10 8 10