What are the private QoS extensions?
A. DOCSIS 1.0+ provides additional QoS features for realtime voice, fax, and data packets from the Integrated Telephony Cable Modems (ITCMs). In DOCSIS 1.0+, the private extensions added to DOCSIS 1.0 are: • Two new CM-initiated dynamic MAC messages: Dynamic Service Addition (DSA) and Dynamic Service Deletion (DSD). These messages allow dynamic Service IDs (SIDs) to be created or deleted at runtime on a per-call basis. • Unsolicited Grant Service (constant bit rate [CBR]-scheduling) on the upstream. This provides high quality QoS channel for the upstream CBR voice and fax packets from the ITCM. • For any given ITCM, ability to provide separate downstream rates based on the IP-precedence value in the packet. This helps separate voice, signaling, and data traffic going to the same ITCM for rate-shaping purposes.
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