Concatenation; Dynamic Mac Messages; Enhanced Quality Of Service - Cisco cBR 8 Configuration Manual
Cbr series converged broadband routers
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Also See for cBR 8:
- Installation instructions manual (27 pages) ,
- Configuration and troubleshooting manual (254 pages) ,
- Hardware installation manual (270 pages)
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Concatenation
• X.509 Digital certificates provide secure user identification and authentication. The Cisco CMTS supports
• Key encryption uses 168-bit Triple DES (3DES) encryption that is suitable for the most sensitive
• 1024-bit public key with Pkcs#1 Version 2.0 encryption.
• Support for encrypted multicast broadcasts, so that only authorized service flows receive a particular
• Secure software download allows a service provider to upgrade a cable modem's software remotely,
Concatenation
Concatenation allows a cable modem to make a single time-slice request for multiple upstream packets,
sending all of the packets in a single large burst on the upstream. Concatenation can send multiple upstream
packets as part of one larger MAC data frame, allowing the cable modem to make only one time-slot request
for the entire concatenated MAC frame, reducing the delay in transmitting the packets on the upstream channel.
This avoids wasting upstream bandwidth when sending a number of very small packets, such as TCP
acknowledgement packets.
Dynamic MAC Messages
Dynamic Service MAC messages allow the cable modem to dynamically create service flows on demand.
These messages are DOCSIS link layer equivalents of the higher layer messages that create, tear down, and
modify a service flow.
The DOCSIS 1.1 dynamic services state machine supports the following messages:
• Dynamic Service Add (DSA)—This message is used to create a new service flow.
• Dynamic Service Change (DSC)—This message is used to change the attributes of an existing service
• Dynamic Service Deletion (DSD)—This message is used to delete an existing service flow.
These messages are collectively known as DSX messages.
Note
Enhanced Quality of Service
DOCSIS 1.1 provides enhanced quality of service (QoS) capabilities to give priority for real-time traffic such
as voice and video:
• The DOCSIS 1.0 QoS model (a service ID (SID) associated with a QoS profile) has been replaced with
Cisco cBR Series Converged Broadband Routers Quality of Services Configuration Guide for Cisco IOS XE
Fuji 16.7.x
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both self-signed manufacturer's certificates and certificates that are chained to the DOCSIS Root CA
certificate.
applications.
multicast broadcast.
without the risk of interception, interference, or alteration.
flow.
a service flow and service class model that allows greater flexibility in assigning QoS parameters to
different types of traffic and in responding to changing bandwidth conditions.
DOCSIS 1.1 for the Cisco CMTS Routers
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