I/O Modules - IBM BladeCenter T 8720 Installation And User Manual

I/O modules

You can install a maximum of four I/O modules at the rear of the system (a
maximum of four Gbit Ethernet switches, or a maximum of two Gbit Ethernet
switches and two Fibre Channel switches). The minimum system configuration
requires one Gbit Ethernet switch or pass-thru module. The I/O switch modules
provide high-performance connectivity between the blade servers.
See the documentation that comes with each I/O module for a description of the
LEDs and connectors on the I/O module.
Note: The service processor, management module, or systems-management
function must monitor the alarm reset inputs to maintain the fault condition
that you set for the unit. The alarm reset inputs can be voltages in excess
of standard logic levels, so you must to electrically or optically isolate
them from the monitoring logic.
Table 4. Alarms connector pinout
Pin # Description
1 Minor alarm reset +
2 Minor alarm reset -
3 Major alarm reset +
4 Major alarm reset -
5 Critical alarm normally
open
6 Critical alarm normally
closed
7 Critical alarm common
8 Minor alarm normally open
The electrical specifications for the alarms 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
I/O Pin # Description
I 9 Minor alarm normally
closed
I 10 Minor alarm common
I 11 Major alarm normally open
I 12 Major alarm normally
closed
O 13 Major alarm common
O 14 Reserved
O 15 Reserved
O
Chapter 4. BladeCenter T components, controls, and LEDs
I/O
O
O
O
O
O
O
O
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