Working With Cables; Cabling The Rs-485 Connectors - IBM xSeries 330 Hardware Maintenance Manual

Working with cables

The server has two different cabling options: the ASM bus and the Cable Chaining
Technology (C2T). The following sections discuss each of these options. While
reading about these options, keep in mind that they are independent of each other.
Note: Refer to the following illustration to locate the connectors on the back of
Ethernet 1 speed
indicator (green)
Ethernet 2 speed
indicator (green)
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
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
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
3. Starting at the top server in the ASM bus, connect one end of the cable into the
4. Continue connecting the servers together in this manner until you reach the
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Hardware Maintenance Manual: xSeries 330 Type 8675
your server.
Ethernet 1 link
indicator (green)
Ethernet 2 link
indicator (green)
IBM Remote Supervisor Adapter, you can connect a maximum of 11 units or
servers together.
that came with the adapter.
with RJ-45 connectors.
RS-485 (B) connector and the other end of the cable into the RS-485 (A)
connector of the next server.
next-to-last server in the ASM bus.
Advanced System
Management RS-485 connectors
C2T (Out) connector
Select light (green)
USB 2
connector
USB 1
Power-on
connector
light (green)
System error
light (amber)
Serial connector
C2T (In) connector