Logical Channels; Channel Types - Motorola BSR 2000 Configuration And Management Manual

BSR 2000 Configuration and Management Guide

Logical Channels

For DOCSIS 1.0 and 1.1, a single channel was associated with each single physical
port on a BSR 2000. DOCSIS 2.0 introduces the ability to have logical upstream
channels on each single physical port. Logical channels allow accommodation of
DOCSIS 1.0 and 1.1 (legacy) cable modems in a DOCSIS 2.0 environment.

Channel Types

DOCSIS 2.0 allows operators to assign a channel type to each logical channel
associated with a physical port. A channel type allows (or restricts) the kind of cable
modem (DOCSIS 2.0, 1.1, or 1.0 compliant) that can operate over the logical channel
to which the channel type is assigned. Available channel types are listed in
Channel Type
TDMA (Time Division Multiple
Access)
MTDMA (Mixed TDMA and
A-TDMA)
A-TDMA (Advanced TDMA)
S-CDMA (Synchronous Code
Division Multiple Access)
6-20
In addition to the QPSK and 16 QAM modulations available in DOCSIS 1.0 and
1.1, DOCSIS 2.0 adds: 8QAM, 32Qam and 64QAM.
Additional Forward Error Correction (FEC) (16 correctable bytes per codeword)
Additional burst protection through byte interleaving
Additional multipath protection (24 tap equalizer)
Table 6-1 Channel Types Supported by DOCSIS 2.0
DOCSIS Specification Type Comment
Type 1
Type 2
Type 3A
Type 3S
DOCSIS 1.0 and 1.1 only channel
type
DOCSIS 2.0, DOCSIS 1.1 and 1.0
channel type
DOCSIS 2.0 only channel type
DOCSIS 2.0 only channel type
MGBI
Release 1.0
Table 6-1:
526360-001-00 Rev. B