IBM BladeCenter HT 8740, Problem Determination And Service Manual

Page: 38 / 158

Pin # Description Input/Output signal
14 Reserved Reserved
15 Reserved Reserved
The electrical specifications for the alarm panel interface connector are as
follows:
– Outputs
- Voltage range: 0 V dc to -100 V dc (maximum current 0.3 A at 100 V dc)
- Current range: 0 A to 1 A (maximum voltage 30 V dc at 1 A)
- Worst-case VA: 1 A at -30 V dc (30 VA maximum) indefinitely
– Inputs
- Voltage range: 0 V dc to -100 V dc (including transients)
- Differential input voltage: 3 V dc to 72 V dc
– Reset input activation
Pulse width: 200 ms (minimum) to 300 ms
Note: The reset input only resets the state of the relay contact. The chassis
alarm status does not change.
Multiplexer expansion module :
The multiplexer expansion module controls the USB connectors, video signals, and
management module connections to the blade servers. There are two information
LEDs on the multiplexer expansion module:
v
FRU ready for removal: When this blue LED is lit, it is safe to remove the
device from the BladeCenter HT unit. Under normal conditions, the blue FRR
LED on the multiplexer expansion module that is associated with the active
management module is off, and the blue FRR LED on the multiplexer expansion
module that is associated with the standby management module is lit. If both
blue FRR LEDs are lit, see “Module LEDs” on page 115 for troubleshooting
information.
Note: When you remove the multiplexer expansion module, you must install
another multiplexer expansion module in its place to maintain proper cooling in
the BladeCenter HT unit.
v
Multiplexer expansion module fault: When this amber LED is lit, there is a
fault on the multiplexer module. The system can continue to operate, usually
without the use of the components on the multiplexer module.
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BladeCenter HT Type 8740 and 8750: Problem Determination and Service Guide