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BXM Functional Description
For ABR cells, additional functions are performed by the SABRE ABR connection controller, which
includes VS/VD, ForeSight, and virtual connection queueing.
Figure 5-13 BXM Port Egress Operation
Backplane/
StrataBus
Operation in Trunk Mode
This section is an overview of the operation of a BXM interface configured in the trunk mode for
connection to another node.
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 trunk 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
BPX
DRSIU
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 through the BPX backplane.
SUNI
ACP
ASIC
Control/Admin Processor
(ACP)
Q-Database
Ingress
Queue
Engine
QE
Monitoring,
ABR
Connection
Controller
BPX
SABRE
Fabric
Backplane
SIMBA
ABR
Connection
Controller
SABRE
Engress
Queue
Engine
QE
Q-Database
Release 9.3.30, Part Number 78-12907-01 Rev. E0, May 2005
Chapter 5
BXM Card Sets: T3/E3, 155, and 622
SONET/SDH UNI ASIC
Sub-system Processor
Application Specific Integrated Ckt
Stats Thresh
RCMP
Route
Control,
Traffic
Policing
SUNI
8 or 12 port
for
OC3
or
OC155.52
OC12
Mbps 4 or 8
or
Mux/
Demux
for
T3/E3
1 or 2 port
Stats Thresh
Back
Card
T3/E3
or
port
or
OC12
To
622.08
UNI
Mpbs
CPE
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Troubleshooting
