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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
Figure 5-14 BXM Trunk Ingress Operation
The egress flow of ATM cells out of the BXM when the card is configured for trunk operation is shown
in Figure 5-15.
In egress, ATM cells are:
1. Routed to the BXM from the BPX crosspoint switch,
2. Applied to the DRSIU,
3. To an egress queue per class of service, and
4. Served out to the SUNI (OC-3/OC-12) or Demux/Mux (T3/E3).
5. The SUNI or Demux/Mux, as applicable, processes the ATM cells into frames,
6. Processing the cells from the ATM layer to the physical and
7. On out to the backcard trunk interface connecting to another node or network.
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