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Chapter 22: Channel Bonding

STANDARD Revision 1.0 C4® CMTS Release 8.3 User Guide

Service Flow Channel Selection

Once the C4/c CMTS has determined the RCC for the CM, it must assign each service flow to either an individual channel or

a bonding group within the RCC. This process attempts to use the required and forbidden attribute masks of each flow to

select the proper resource (either bonding group or individual channel) for the flow.

Attribute Masks

For each flow, the first question to be answered is whether the flow is to be created on a bonded channel set or on a single

individual channel. The C4/c CMTS assumes that all downstream flows are candidates for bonding. The exceptions to this

rule are voice bearing flows and any flows that have the bonding bit set in the flow’s forbidden attribute mask.

For each flow which is a candidate for bonding, the C4/c CMTS will attempt to identify a bonding group which meets the

specified required and forbidden attributes for the flow. The bonding group candidates may be either just the provisioned

bonding groups or a combination of the provisioned and dynamically created bonding groups (if enabled). If no suitable

bonding group could be found, then the C4/c CMTS will attempt to find a single channel which satisfies the requested

required and forbidden attributes. If no suitable single channel is found, then the C4/c CMTS will assign the flow to a single

channel of its choosing.

If the flow is not a bonding candidate, then the C4/c CMTS attempts to find a single channel which satisfies the requested

required and forbidden attributes. If no suitable single channel is found, then the C4/c CMTS will assign the flow to a single

channel of its choosing.

Here are two ways to set the forbidden bit in the attribute mask:

1. Define a service class with a key Service Class Name (SCN) on the C4/c CMTS with the bits set in the forbidden mask,

then define flows that use that SCN. This can be done using the CM config file, or by using PacketCable Multimedia

(PCMM) traffic profile type 2 for a dynamic flow.

2. Use PCMM with a version I04 or higher policy server, using traffic profile types 3 (best-effort), 4 (NRTP), 5 (RTP), 6

(UGS), 7 (UGS_AD) or 8 (Downstream). This works for dynamic flows only.

Arris C4C User Manual

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