IBM eServer 232 xSeries, Руководство пользователя

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Chapter 5. Installing Options
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The Integrated System Management ports (ISM-A and ISM-B), use a dual RJ-45
connector to interconnect processors of several rack-mounted servers, through an
optional Remote Supervisor Adapter. The servers can communicate through half-
duplex mode. You should use ISM-B as the input connector and ISM-A as the output
connector to the next server.
Future releases of the Integrated System Management (ISM) firmware code will
enable the Integrated System Management processor to send or forward alerts to IBM
system management adapters using the ISM ports.
Note: For this function to work properly, one of the servers must have the Remote
Supervisor Adapter installed.
Universal Serial Bus ports
Your server has two Universal Serial Bus (USB) ports, which configure automatically.
USB is an emerging serial interface standard for telephony and multimedia devices. It
uses Plug and Play technology to determine the type of device attached to the
connector.
Notes:
1. If you attach a standard (non-USB) keyboard to the keyboard connector, the USB
ports and devices will be disabled during the power-on self-test (POST).
2. If you install a USB keyboard that has a mouse port, the USB keyboard emulates
a mouse and you will not be able to disable the mouse settings in the
Configuration/Setup Utility program.
USB cables and hubs
You need a 4-pin cable to connect devices to USB 1 or USB 2. If you plan to attach
more than two USB devices, you must use a hub to connect the devices. The hub
provides multiple connectors for attaching additional external USB devices.
USB technology provides up to 12 megabits-per-second (Mbps) speed with a
maximum of 127 external devices and a maximum signal distance of five meters (16
ft) per segment.