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AT8901
3.2
Base Switch
The base switch is a Broadcom BCM56500 (full featured version) or BCM56300 (lite featured
version) 24 port GbE multilayer switch that can operate in 10/100/1000 Mbps. It integrates ad-
vanced Layer 3 switching features for IPv4 and IPv6 routing. The BCM56500 also includes en-
hanced QoS support and jumbo packet line rate switching.
The PPC controls the switch over a 32bit/66MHz PCI Interface.
Base Interface (Zone 2)
The board supports 15+2 ATCA backplane channels. The board can operate in a dual star and
full mesh configuration. The switch is connected to the backplane via four 10/100/1000BASE-
T quad PHYs and eight 10/100/1000BASE-T dual magnetics. The pin assignment for the Zone
2 connectors is compliant to the PICMG 3.0 standard. GbE channels 0/20 and 0/24 of the
switch are the 100BASE-TX ShMC base channels (ShMC cross-connects).
Table 3-6:
Base Interface Port Mapping
CLI ID
0/1
Uplink 1
0/2
Uplink 2
0/3
Uplink 3
0/4
Uplink 4
0/5
16
0/6
15
0/7
14
0/8
13
0/9
12
0/10
11
0/11
10
0/12
9
0/13
8
0/14
7
0/15
6
0/16
5
0/17
4
0/18
3
0/19
2
0/20
SMCA
0/21
Local AMC B1, channel 0
0/22
Remote AMC B1, channel 1
0/23
Local AMC B2, channel 0
0/24
SMCB
Channel
-
-
-
-
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
-
-
-
1
Page 3 - 6
Hardware Description
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AT8901 User Guide
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