Cisco Systems MGX 8220 Cisco MGX 8220 Backplane

2-3
Cisco MGX 8220 Installation and Configuration
Release 5.0, Part Number 78-6430-03 Rev. D0, November 2003
Chapter Cisco MGX 8220 Shelf
Figure2-1 Front View of the Cisco MGX 8220 Shelf with Cards Installed
Figure2-2 Rear View of the Cisco MGX 8220 Shelf
Cisco MGX 8220 Backplane
The Cisco MGX 8220 backplane contains a main system bus, and the cell bus for communication
between card slots. The cell bus consists of two pairs of unidirectional buses (for redundancy), which
are used for transferring cell s be tw ee n the cell bus slave modules (FRSM, AUSM, A S C) a nd t he ce ll
bus master (BNM).
The backplane also contains a local bus, which permits the ASC to configur e and monitor the BNM and
SRM, a BERT bus for bit error rate testing, and a redundancy bus for support of 1:N service module
redundancy.
The backplane distributes –48V DC power to all card slots, and all modules ar e h o t i nse rt ab le .
ACT
STBY
FAIL
LAN
ASC
• • • • •
• • • • •
ACT
STBY
FAIL
LAN
ASC
• • • • •
• • • • •
ACT
STBY
FAIL
PORT
BNM
ACO
HIST
T3
DC-A
DC-B
MIN
MAJ
ACO
HIST
• • • • •
• • • • •
ACT
STBY
FAIL
PORT
BNM
ACO
HIST
T3
DC-A
DC-B
MIN
MAJ
ACO
HIST
• • • • •
• • • • •
ACT
STBY
FAIL
PORT 1
PORT 2
PORT 3
PORT 4
4E1-C
FRSM
• • • • •
• • • • •
ACT
STBY
FAIL
PORT 1
PORT 2
PORT 3
PORT 4
4E1-C
FRSM
• • • • •
• • • • •
ACT
STBY
FAIL
PORT 1
PORT 2
PORT 3
PORT 4
4E1-C
FRSM
• • • • •
• • • • •
ACT
STBY
FAIL
PORT 1
PORT 2
PORT 3
PORT 4
4E1-C
FRSM
• • • • •
• • • • •
ACT
STBY
FAIL
PORT 1
PORT 2
PORT 3
PORT 4
4E1-C
FRSM
• • • • •
• • • • •
• • • • •
• • • • •
• • • • •
• • • • •
• • • • •
• • • • •
• • • • •
• • • • •
• • • • •
• • • • •
• • • • •
• • • • •
ACT
STBY
FAIL
PORT 1
PORT 2
PORT 3
PORT 4
4E1-C
FRSM
• • • • •
• • • • •
12345678910111213141516
H8243
T3E3-B T3E3-B
DB15-4T1 DB15-4T1 DB15-4T1 DB15-4T1 DB15-4T1 DB15-4T1 DB15-4T1 DB15-4T1 DB15-4T1 DB15-4T1
16151413121110987654321
ASCASC
1B power
connector 1A power
connector
P1 cooling
assembly
connector
•• ••
H8244