IBM BladeCenter HT 8740 Problem Determination And Service Manual page 37

blade server requires attention, the location LED on the blade server usually will
also be lit. After the BladeCenter HT unit has been located, you can have the
system administrator turn off the location LED.
v Critical system fault: When this LED is lit, the BladeCenter HT unit has a
critical system fault. A critical system fault is an error or event that is detected by
the system with a significant impact to the system. In this case, the system
cannot continue to operate or is operating in a non-redundant power
configuration or a non-redundant cooling configuration.
Note: The color of this LED can be set to amber or red through the
management module.
v Major system fault: When this LED is lit, the BladeCenter HT unit has a major
system fault. The system can continue to operate but may loose some
functionality and performance.
Note: The color of this LED can be set to amber or red through the
management module.
v Minor system fault: When this amber LED is lit, the BladeCenter HT unit has a
minor system fault. The system can continue to operate, usually without
noticeable loss of functionality or performance. The minor-system-fault LED will
be enabled.
v FRU ready for removal: When this blue LED is lit, it is safe to remove the
device from the BladeCenter HT unit.
v Alarm panel module fault: When this amber LED is lit, there is a fault on the
alarm panel module. The system can continue to operate, usually without the use
of the components on the alarm panel module.
v Serial connector: This DB60 connector provides direct access to the serial ports
on each of the 12 blade server bays. Use this connector to attach the optional
serial port breakout cable and connect up to 12 local consoles. See the
documentation that comes with your blade server to determine if it supports this
cable.
v Telco alarm connector: The alarm panel module provides one DB15 connector
(male) for critical, major, and minor telco alarms. Each of the alarms has a relay
that enables multiple system alarm indicators to be daisy-chained together. The
following table shows the pinouts for the alarm panel interface connector.
Pin #
1
2
3
4
5
6
7
8
9
10
11
12
13
Description
Minor alarm reset +
Minor alarm reset -
Major alarm reset +
Major alarm reset -
Critical alarm normally open
Critical alarm normally closed Output
Critical alarm common
Minor alarm normally open
Minor alarm normally closed
Minor alarm common
Major alarm normally open
Major alarm normally closed
Major alarm common
Input/Output signal
Input
Input
Input
Input
Output
Output
Output
Output
Output
Output
Output
Output
Chapter 1. Introduction
19