6-20 Cisco BPX 8600 Series Reference
BXM Functional Description
Overview, Trunk Mode
This provides an overview of the operation of the BXM when the card is configured in the trunk
mode for connection to another node or network.
Ingress
The ingress flow of ATM cells into the BXM when the card is configured for trunk operation is
shown in Figure 6-11.
ATM cells from a node or network are processed at the physical interface level by the SUNI
(OC3/OC12) or Demux/Mux (T3/E3), routed to applicable ingress slot queues, and served out to the
BPX crosspoint switch via the BPX Backplane.
Figure 6-11 BXM Trunk Ingress Operation
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
Ingress
Queue
Engine
QE
Engress
Queue
Engine
QE
Cell Memory
Q-Database Stats Thresh
S6169
From
Node or
Network
via NNI
