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