Cisco Systems 8600 Series manual BXM Functional Description, Overview, Port UNI Mode

BXM Functional Description

BXM Functional Description

This functional description provides an overview of BXM operation.

Overview, Port (UNI) Mode

The following provides an overview of the operation of the BXM card when the ports are configured in port (access) mode for connection to customer equipment (CPE).

Ingress

The ingress flow of ATM cells into the BXM when the card is configured for port (access) operation is shown in Figure 6-9.

ATM cells from the CPE are processed at the physical interface level by the SUNI (OC3/OC12) or Mux/Demux (T3/E3), policed per individual VC by the RCMP and routed to applicable ingress queues. In addition, for ABR cells, additional functions are performed by the SABRE ABR connection controller, including: VS/VD, Foresight, and virtual connection queueing. The cells are served out via the BPX Backplane to the BPX crosspoint switch in an order of priority based on their connection type.

BXM T3/E3, 155, and 622 6-17