Specifically, the cable modem will attempt to reestablish connectivity
using the downstream and upstream channels it had been using previously, and
Hybrid Fiber-Coax 157
if unsuccessful, after a time-out the CM will attempt to locate an alternative channel
or channels. The CMTS is also required to report the status for each cable modem to
which it is connected via standard network management tools.
Quality of Service As described previously, DOCSIS specifications provide a very rich
set of quality of service (QoS) features that can be used to customize the service offerings
based on customer needs. A Service Provider can configure committed information
rates, burst sizes, excess information rates, latency bounds, and so on, to match the QoS
requirements of the customer. A mix of traffic with differing QoS requirements can be
supported simultaneously, with each type of traffic, or even each session, getting the QoS
guarantee needed to provide the customer with an acceptable quality of experience. QoS
for aggregate traffic can be changed dynamically, and QoS for individual sessions can be
provisioned on-demand to allow for a very efficient and customized service offering.
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