IBM Remote Supervisor Adapter II, Installation Manual

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Make sure that the firmware for the Remote Supervisor Adapter II, Remote
Supervisor Adapter, ASM processor, ASM PCI adapter, and ISMP is at the
latest level.
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The servers in an ASM interconnect network are referred to by their
assigned names, not by their positions in the rack cabinet.
An ASM interconnect network can have up to 24 RS-485 connections,
depending on the configuration. The connections can include Remote
Supervisor Adapter IIs, Remote Supervisor Adapters, ASM processors, ASM
PCI adapters, and ISMPs. Use the following information to determine the
number of servers and connections that you can have on your ASM
interconnect network:
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Each Remote Supervisor Adapter II, Remote Supervisor Adapter, ASM
processor, ASM PCI adapter, and ISMP in a server that is connected to the
network uses one connection. For example, if a server that is connected to
the network has a Remote Supervisor Adapter and an integrated ASM
processor, the server uses two connections on the network.
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The network must include at least one server with a Remote Supervisor
Adapter II or Remote Supervisor Adapter (either installed as an option or
preinstalled in the server).
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On an ASM interconnect network, one ASM processor or one ASM PCI
adapter can communicate with 11 RS-485 connections. These connections
must be to ASM processors, ASM PCI adapters, Remote Supervisor
Adapters, or Remote Supervisor Adapter IIs. The ASM processor and ASM
PCI adapter cannot communicate with ISMPs.
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If your existing ASM interconnect network has 12 RS-485 connections that
include only ASM processors, ASM PCI adapters, and at least one Remote
Supervisor Adapter or Remote Supervisor Adapter II, you can also add up
to 12 ISMP-based servers to this same network. The Remote Supervisor
Adapter on this network will communicate with all 23 RS-485 connections;
however, an ASM processor or ASM PCI adapter on this network will
communicate with only the 11 non-ISMP RS-485 connections. The ASM
processor and ASM PCI adapter will not recognize the ISMPs, but the ISMPs
can be on the same ASM interconnect network.
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Make sure that the ASM interconnect network is set up as a bus, not as a
ring. You must connect the servers to the ASM interconnect network in a
series, with terminated beginning and end points. Be sure to use the RS-485
terminator plugs. For more information, see “Using the RS-485 terminator
plugs on interconnected servers” on page 29.
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Make sure that the total combined length of all Ethernet cables connecting
the servers in the ASM interconnect network does not exceed 91 m (300 ft).
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Remote Supervisor Adapter II: Installation Guide