Enhanced Rate Bandwidth Allocation (Erba) Support For Docsis 1.0 Cable Modems - Cisco cBR 8 Configuration Manual
Cbr series converged broadband routers
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DOCSIS 1.1 for the Cisco CMTS Routers
For this configuration...
DOCSIS 1.1 CMTS with DOCSIS 1.0+ cable modems
DOCSIS 1.1 CMTS with DOCSIS 1.1 cable modems
Enhanced Rate Bandwidth Allocation (ERBA) Support for DOCSIS 1.0 Cable
Modems
To define ERBA on the downstream for DOCSIS 1.0 cable modems, use the cable qos promax-ds-burst
command in global configuration mode.
The ERBA feature is characterized by the following enhancements:
• Enables support for the DOCSIS1.1 Downstream Maximum Transmit Burst parameter on the Cisco
• Allows DOCSIS1.0 modems to support the DOCSIS1.1 Downstream Maximum Transmit Burst parameter
ERBA allows DOCSIS1.0 modems to burst their temporary transmission rate up to the full line rate for short
durations of time. This capability provides higher bandwidth for instantaneous bandwidth requests, such as
those in Internet downloads, without having to make changes to existing service levels in the QoS Profile.
This feature allows you to set the DOCSIS 1.0 cable modems burst transmissions, with mapping to overriding
DOCSIS 1.1 QoS profile parameters on the Cisco CMTS. DOCSIS 1.0 cable modems require DOCSIS 1.0
parameters when registering to a matching QoS profile. This feature enables maximum downstream line rates,
and the ERBA setting applies to all cable modems that register to the corresponding QoS profile.
Note
QoS definitions must previously exist on the Cisco CMTS headend to support this feature.
ERBA for DOCSIS 1.0 cable modems is supported with these new or enhanced commands or keywords:
Enhanced Rate Bandwidth Allocation (ERBA) Support for DOCSIS 1.0 Cable Modems
CMTS by using the cable ds-max-burst configuration command.
by mapping DOCSIS1.0 modems to overriding DOCSIS 1.1 QoS profile parameters on the Cisco CMTS.
Cisco cBR Series Converged Broadband Routers Quality of Services Configuration Guide for Cisco IOS XE Fuji
The result is...
DOCSIS 1.0+ cable modems receive basic DOCSIS
1.0 support. BPI is supported if available and enabled
on the CMTS. In addition, DOCSIS 1.0+ cable
modems also receive the following DOCSIS 1.1
features:
• Multiple SIDs per cable modem
• Dynamic service MAC messaging initiated by
the cable modem
• Unsolicited grant service (UGS,
CBR-scheduling) on the upstream
• Separate downstream rates for any given cable
modem, based on the IP-precedence value
• Concatenation
DOCSIS 1.1 cable modems receive all the DOCSIS
1.1 features listed in this document. BPI+ is supported
if available and enabled on the CMTS.
16.7.x
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