Cable operators stay ahead of the demand by evolving their
networks. Some tools available to the operator include node splits, node recombining, and
multichannel load balancing. In a node split, the operator replaces a single fiber node with
two, cutting in half the number of households passed per fiber node. With node recombining,
the operator modifies the CMTS connectivity such that the downstream channel is
split over a smaller number of fiber nodes (two or three rather than four). With multichannel
load balancing, the operator adds a second (or third) downstream or upstream channel
Figure 6.1 Typical DOCSIS network deployment scenario
Fiber node
Cable
modem
Customer
premises
equipment
Service group
~500 HHP
Tap Bidirectional
amplifier
Video signals
Combiner Fiber Tx
Splitter
Downstream
channel
Internet
Upstream
channels
Fiber Rx
Typical deployment scenario:
Four service groups;
~2000 households passed (HHP)
10/100/1000BT Ethernet
Coaxial cable
Fiber
CMTS
Provisioning and
management servers
FN A
FN B
FN C
FN D
FN A
FN B
FN C
FN D
160 Chapter 6
that provides service to the service group(s). The CMTS then automatically (and dynamically)
maintains a balance of modems on each channel.
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