Cabling The Rs-485 Ports - IBM eServer 330 xSeries Installation Manual

2. Connect the power cords and all external cables to the server; then, plug the
3. Continue with "Cabling the RS-485 ports" and "Connecting the servers with a C2T

Cabling the RS-485 ports

You can use the RS-485 connectors to create an ASM bus between several xSeries
330 servers.
Before you begin, review the following:
•
•
•
Note: For more information about the IBM Remote Supervisor adapter, see the
Connecting the ASM bus
The servers in the ASM bus are referred to by their assigned addresses and not their
position in the rack.
After you install the server 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 unshielded
3. Starting at the topmost server to be included in the ASM bus, plug one end of the
4. Continue connecting the servers together in this manner until you reach the
5. Connect a cable from the RS-485 (B) connector of the second-to-last server to
6. Turn on the servers. See "Turning on the server" on page 21.
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IBM® xSeries 330: Installation Guide
power cords into properly grounded electrical outlets.
chain" on page 17.
The ASM bus is designed to connect up to twelve units or servers. When using
the IBM Remote Supervisor adapter, you can connect a total of eleven units or
servers.
You can hot-swap the cables in the ASM bus.
Use standard unshielded twisted pair (UTP) cables with RJ-45 connectors.
documentation that comes with the adapter.
twisted pair (UTP) cables with RJ-45 connectors.
cable into the RS-485 (B) connector and the other end of the cable into the RS-
485 (A) connector of the next server.
second-to-last server in the ASM bus.
the RS-485 (B) connector of the last server. Refer to the following illustration to
see how to connect the ASM bus.
Ethernet cable
with RJ-45 connectors
RS-485(B)
RS-485(B)
RS-485(B)
RS-485(A)
RS-485(A)
RS-485(A)