Flexible mapping of upstream channels to downstream channels
Supported in all C4 and C4c CMTS chassis
The 24U Cable Access Module (CAM) provides twenty-four physical upstream RF receivers on a single blade for the ARRIS C4 Cable Modem Termination System (CMTS). The 24U CAM uses the same Physical Interface Card (PIC) as the current 12U CAM with eight F connectors. In addition, these upstream channels can be positioned anywhere in the upstream spectrum of 5 MHz to 85 MHz (5 to 65 MHz with Release 8.0).The 24U CAM supports DOCSIS 3.0 upstream channel bonding with variable size bonding groups and flexible channel configurations. This allows for the aggregation of two or more DOCSIS upstream channels to support high upstream bandwidths. The flexible channel configurations allows operators to bond across channels that use different modulations and channel widths, providing the flexibility an operator needs to accommodate non-DOCSIS 3.0 and DOCSIS 3.0 modems on the same upstream module. The C4 CMTS software allows up to four upstream channels to be bonded, and all 24 channels of the 24U CAM support bonding (in groups of four channels each).The C4 CMTS contains patented FlexCAM technology that provides fully integrated “hitless” RF sparing. This sparing includes support for multiple 24U CAM RF sparing groups, the size of which can vary from one to nine active 24U CAMs. If a failure occurs on a 24U CAM with “hitless” RF sparing, the spare 24U CAM automatically replaces the failed module so that cable modems remain in service with minimal packet loss.With the 24U CAM, an MSO can map the twenty-four physical upstream receivers to the eight physical F connectors with a maximum of 12 upstreams on a single F connector.