Operation In Trunk Mode; Figure 5-13 Bxm Port (Access, Uni) Egress Operation - Cisco BPX-BXM-155-8DX Installation And Configuration Manual

BXM Functional Description
For ABR cells, additional functions are performed by the SABRE ABR connection controller,
including: VSVD, Foresight, and virtual connection queueing.

Figure 5-13 BXM Port (Access, UNI) Egress Operation

BPX
Backplane/
StrataBus

Operation in Trunk Mode

This section is an overview of the operation of the BXM when the card is configured in the trunk mode
for connection to another node or network.
The ingress flow of ATM cells into the BXM when the card is configured for trunk operation is shown
in Figure 5-14.
On ingress, ATM cells from a node or network are:
1.
2.
3.
Cisco BPX 8600 Series Installation and Configuration
5-24
SABRE Scheduling and ABR Engine
SIMBA Serial I/F and Multicast Buffer ASIC
RCMP Routing Ctl, Monitoring, & Policing ASIC
DRSIU
Dual Receiver Serial I/F Unit
Cell Memory
800 Mbps
Ingress
to BPX
Switching
Matrix
DRSIU Backplane
1.6 Gbps
Egress
from
BPX
Switching
Matrix
Cell Memory
Processed at the physical interface level by the SUNI (OC-3/OC-12) or Demux/Mux (T3/E3)
Routed to applicable ingress slot queues
Served out to the BPX crosspoint switch via the BPX Backplane.
SUNI
ACP
ASIC
Control/Admin Processor
(ACP)
Q-Database Stats Thresh
Ingress
Queue
Engine Control,
QE Monitoring,
Policing
ABR
Connection
Controller
BPX
SABRE
Fabric
SIMBA
ABR
Connection
Controller
SABRE
Engress
Queue
Engine
QE
Q-Database Stats Thresh
Release 9.3.0, Part Number 78-10674-01 Rev. D0, July 2001
Chapter 5 BXM Card Sets: T3/E3, 155, and 622
SONET/SDH UNI ASIC
Sub-system Processor
Application Specific Integrated Ckt
RCMP
Route
Traffic
SUNI
8 or 12 port
for
OC3
or
OC155.52
OC12
Mbps 4 or 8
or
Mux/
Demux
for
T3/E3
622.08
1 or 2 port
Back
Card
T3/E3
or
port
or
OC12
To
UNI
Mpbs
CPE