IBM 867431X Hardware Maintenance Manual - Page 117

Cabling the RS-485 connectors, RS-485 A and RS-485 B.

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Note: Refer to the following illustration to locate the connectors on the back of your server. Ethernet 1 speed indicator (green) Ethernet 1 link indicator (green) Advanced System Management RS-485 connectors C2T (Out) connector Select light (green) Ethernet 2 link indicator (green) Ethernet 2 speed indicator (green) USB 2 connector Power-on light (green) USB 1 connector System error light (amber) Serial connector C2T (In) connector The ASM connectors on the back of the server are referred to in this book as RS-485 (A) and RS-485 (B). Cabling the RS-485 connectors You can use the RS-485 connectors to create an ASM bus between several xSeries 330 servers or other servers. Before you begin, review the following: v The ASM bus is designed to connect up to 12 units or servers. When using the IBM Remote Supervisor adapter, you can connect a maximum of 11 units or servers together. v You can hot-swap the cables in the ASM bus. v Use standard unshielded twisted pair (UTP) cables with RJ-45 connectors. Note: For more information about the ASM PCI adapter, see the documentation that came with the adapter. The servers in the ASM bus are referred to by their assigned addresses and not their positions in the rack. Complete the following steps to connect the ASM bus: 1. Turn off the servers. 2. Locate the RS-485 connectors on the rear of the servers and several UTP cables with RJ-45 connectors. 3. Starting at the top server in the ASM bus, connect one end of the cable into the RS-485 (B) connector and the other end of the cable into the RS-485 (A) connector of the next server. 4. Continue connecting the servers together in this manner until you reach the second-to-last server in the ASM bus. 5. Connect a cable from the RS-485 (B) connector of the second-to-last server to the RS-485 (B) connector of the last server. Refer to the following illustration to Installing options 109

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Note:
Refer to the following illustration to locate the connectors on the back of
your server.
Ethernet 1 speed
indicator (green)
Ethernet 2 speed
indicator (green)
Ethernet 1 link
indicator (green)
Ethernet 2 link
indicator (green)
Power-on
light (green)
Select light (green)
System error
light (amber)
Advanced System
Management RS-485 connectors
Serial connector
USB 1
connector
USB 2
connector
C2T (In) connector
C2T (Out) connector
The ASM connectors on the back of the server are referred to in this book as
RS-485 (A) and RS-485 (B).
Cabling the RS-485 connectors
You can use the RS-485 connectors to create an ASM bus between several xSeries
330 servers or other servers.
Before you begin, review the following:
v
The ASM bus is designed to connect up to 12 units or servers. When using the
IBM Remote Supervisor adapter, you can connect a maximum of 11 units or
servers together.
v
You can hot-swap the cables in the ASM bus.
v
Use standard unshielded twisted pair (UTP) cables with RJ-45 connectors.
Note:
For more information about the ASM PCI adapter, see the documentation
that came with the adapter.
The servers in the ASM bus are referred to by their assigned addresses and not
their positions in the rack.
Complete the following steps to connect the ASM bus:
1.
Turn off the servers.
2.
Locate the RS-485 connectors on the rear of the servers and several UTP cables
with RJ-45 connectors.
3.
Starting at the top server in the ASM bus, connect one end of the cable into the
RS-485 (B) connector and the other end of the cable into the RS-485 (A)
connector of the next server.
4.
Continue connecting the servers together in this manner until you reach the
second-to-last server in the ASM bus.
5.
Connect a cable from the RS-485 (B) connector of the second-to-last server to
the RS-485 (B) connector of the last server. Refer to the following illustration to
Installing options
109