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Cisco BPX 8600 Series Installation and Configuration
Release 9.3.10, Part Number 78-11603-01 Rev. D0, July 2001
Chapter 5 BXM Card Sets: T3/E3, 155, and 622
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
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. Processed at the physical interface level by the SUNI (OC-3/OC-12) or Demux/Mux (T3/E3)
2. Routed to applicable ingress slot queues
3. Served out to the BPX crosspoint switch via the BPX Backplane.
S6168
SUNI
ACP
ASIC
SABRE
SIMBA
RCMP
DRSIU
Scheduling and ABR Engine
Serial I/F and Multicast Buffer ASIC
Routing Ctl, Monitoring, & Policing ASIC
Dual Receiver Serial I/F Unit
SONET/SDH UNI ASIC
Sub-system Processor
Application Specific Integrated Ckt
Control/Admin Processor
(ACP)
Cell Memory
Q-Database Stats Thresh
BPX
Backplane/
StrataBus
800 Mbps
Ingress
to BPX
Switching
Matrix
1.6 Gbps
Egress
from
BPX
Switching
Matrix
DRSIU
BPX
Fabric
Backplane
SIMBA
RCMP
Route
Control,
Monitoring,
Traffic
Policing
SUNI
for
OC3
or
OC12
or
Mux/
Demux
for
T3/E3
Back
Card
T3/E3
8 or 12 port
or
OC155.52
Mbps 4 or 8
port
or
OC12
622.08
Mpbs
1 or 2 port
To
UNI
CPE
ABR
Connection
Controller
SABRE
ABR
Connection
Controller
SABRE
Ingress
Queue
Engine
QE
Engress
Queue
Engine
QE
Cell Memory
Q-Database Stats Thresh