Docsis And Cmts Interoperability; Docsis Ntsc Cable Plants - Cisco 7246VXR - uBR Router Software Configuration Manual

Chapter 1 Overview of Cisco uBR7200 Series Software

DOCSIS and CMTS Interoperability

This section contains the following topics to familiarize you with DOCSIS architectural fundamentals:
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DOCSIS NTSC Cable Plants

DOCSIS-compliant cable plants that support North American channel plans use ITU J.83 Annex B RF.
Figure 1-1
Figure 1-1
Backbone
network
OL-2239-05
"DOCSIS NTSC Cable Plants" section on page 1-137
"EuroDOCSIS Cable Plants" section on page 1-138
"DOCSIS-Compliant Downstream Signals" section on page 1-139
"DOCSIS-Compliant Upstream Signals" section on page 1-140
"Traffic Engineering" section on page 1-142
illustrates a DOCSIS two-way and telco-return architecture.
DOCSIS Two-Way and Telco-Return Architecture
Telco return
PSTN
access
Port
termination
Adapter
WAN
Local
Data over
server
cable service
facility
specification
(DOCSIS)
WAN
Remote
server
facility
Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide
Distribution hub or headend
Operation
Downstream
support system
RF interface
Video 1
Video 2
Cable modem
termination system
(CMTS)
Data
Mod
50-860 MHz
NTSC
Network
5-42MHz
NTSC
Demod
Data
Security &
access
controller Upstream
RF interface
DOCSIS and CMTS Interoperability
Distribution
network
Node
Controller
Node
Coax
Tx
Fiber Node
Rx
RF
Upstream
interface
splitter
and filter
bank
Cable modem
telco return
interface
Cable
modem
Telco
return
1-137