This white paper is intended to explain that there are many different scenarios and permutations with regards to physically wiring cable modem termination systems (CMTSs). You could have a sparse mode where upstream (US) ports on the CMTS are kept separate, a dense mode where signal is fed to multiple US ports, multiple CMTSs on the same physical plant, or different card densities. These combinations affect what happens when provisioning, maintaining, and troubleshooting.
The five CMTS-and-cable-modem (CM) combinations in this document are an attempt to address the issues associated with these permutations. Each combination has multiple scenarios and recommendations. Typical setup requirements, specifications, and default settings are also addressed.
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