Cisco 3410DVB Manual do Utilizador Página 135
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Cable Modem - Block Diagram
Interface
& Memory
Controller
CPU & LAN
Controller
Tuner
DOCSIS
Transceiver
RAM
Flash
DOCSIS
MAC
USB
HPNA 2.0
Connects directly to the
CATV outlet & converts TV
channel to a fix ed lower
frequency (6-40 MHz)
ASSPs provided by: Sharp,
Temic, Panasonic
CPU is prov ided by ARM,
MIPS, PowerPC
Cable MAC ex tracts data
from MPEG frames, filters
data, protocol ex ecution,
times transmission of
upstream bursts. ASSPs
are provided by Texas
Instruments, Broadcom,
Conexant
Performs A/D, D/A, modulation,
demodulation (QAM-64/256),
Reed Solomon FEC and MPEG
frame synchronization. ASSPs
are provided by Broadcom,
Conexant, SGS Thomson, LSI
Logic, VLSI Technologies
/Philips, Fujitsu, Analog Dev ices
- Programmable 1
- Solutions 1
- • Technology overview 2
- • Digital modem technologies 2
- • Conclusions 2
- So What is Broadband Access? 3
- Digital Modem Growth Drivers 4
- Frustrated Maybe … 6
- Source: Dataquest CAGR 39.2% 7
- • Potential to leverage voice 8
- Satellite Modem Overview 10
- Data Broadcasting 11
- System Block Diagram 12
- • Decoder 13
- Broadcom Corporation 14
- Host Interfaces 15
- Satellite Modem Design 16
- Spartan-XL 17
- Spartan-III 17
- Spartan-II 17
- Spartan-II Device Functions 19
- ISDN Overview 22
- Understanding ISDN Equipment 23
- • Widely available 24
- The Original Digital Service 25
- Two Major Variants 26
- ISDN Model 27
- Functional Groupings 28
- Reference Points 29
- U Reference Point 30
- S/T Interface 31
- Proprietary TDM interfaces 32
- ISDN In the Real World 33
- External ISDN Modem 34
- Internal ISDN Modem 35
- Always On ISDN 36
- • Developed by Ascend 37
- • Uses ISDN transport 37
- ASSP Providers 38
- • Design objectives 39
- ISDN PCMCIA Modem 40
- ISDN PCMCIA FPGA 41
- Spartan Functionality 43
- Without Xilinx 44
- With Xilinx 44
- ISDN Summary 45
- Cable Modems 46
- Cable Modem Overview 47
- • Offered by cable companies 48
- Cable Modem - Market Drivers 51
- • Concerns over data security 54
- What is a Cable Modem? 55
- How Do Cable Modems Work? 56
- Set-Top Box 57
- Cable M odem 57
- DOCSIS Cable Modem 58
- Inside a Cable Modem 60
- QAM & QPSK 65
- Downstream Data Channel in 66
- Cable Modem Physical Layer 66
- Upstream Data Channel in 68
- Many Different 70
- • Always-on connection 71
- DSL Overview 73
- ADSL Equipment 74
- DSL Market Trends 75
- DSL Technologies 77
- I/O Routing Ring 79
- Spartan-II Clock Management 80
- Distributed RAM 81
- Block RAM 81
- External Memory 81
- Spartan-II Block RAM 82
- Spartan-II IP Solutions for 87
- HDLC Controllers 87
- Memec Design Services 89
- CoreEL MicroSystems 90
- The Spartan-II Competitive 92
- Advantage: 100k Unit Cost 93
- Solution <$6 94
- Programmable ASSP - Value 95
- Conclusions on Digital Modems 96
- The Digital Modem 97
- Evolves Into The 97
- Residential 97
- Gateways 97
- New Dimensions to Home 98
- Internet Access 98
- Convergence Is Happening! 99
- The Push for Home Networking 100
- • Television 101
- Worldwide Home Network & 102
- Residential Gateway Forecast 102
- Residential Gateway 103
- Solutions Available 105
- Market Requirements and 105
- Access & Home Networking 106
- Television 106
- Broadband Based or 107
- Digital Modems RGs 107
- Broadband Centric or 108
- Home Networking is Here! 110
- First Generation RGs 111
- Second Generation RGs 112
- Third Generation 114
- HiperLAN2) 116
- – Distribution of broadband 117
- – Seamless connection & 117
- – Management software for 117
- Satellite Modems 118
- ISDN Modems 119
- Interface 120
- ADSL Broadcast Solution 121
- DSL Modem Home Gateway 122
- V.90/56K Modems - Analog 125
- Phonelines 125
- Broadband Access in Hotel 125
- – Provides error correction 127
- – Provides data compression 127
- Analog Modems 128
- Satellite Modem Block Diagram 133
- ISDN CPE - Block Diagram 134
- Cable Modem - Block Diagram 135
- Channels 136
- $9.95$9.95 137
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