Specifications

2-6
Cisco IGX 8400 Series Provisioning Guide, Release 9.3.3 and Later Releases
OL-1166-04
Chapter 2 Cisco IGX 8400 Series Cards
Nodal Processor Module
The power supply monitor connector allows you to connect an external power supply monitor.
Pins 2 and 3 indicate the status of the power supplies. These pins are TTL binary logic signals, with a
value of zero indicating a power supply failure and a value of one indicating normal power supply
operation. To use the power supply monitor connector, you need a device that responds with a fail
condition when a zero TTL logic level is present on pin 2 or pin 3.
Caution Do not use the RJ-45 connector on the SCM back card to connect your PC or terminal to the IGX. Power
from the power supply monitor connector will cause damage to your PC or terminal.
Failovers and Card Redundancy
The SCM has integrated, independently-operating internal clock circuitry and phase-lock loops, with
one clock circuit operating system bus A and the other clock circuit off system bus B. If the system bus
A fails, the SCM fails over to the system bus B clock circuitry and the fail LED will turn on. Node
operations will not be affected by SCM back card fail over.
Lower-priority SCM circuits, such as external clock input, control and auxiliary connectors, and power
supply, cabinet temperate, and fan monitoring circuits are not duplicated. Failure of lower-priority
circuits does not cause a system failure, but the SCM reports an alarm.
5RCV +
6Power return
7Reserved
8Reserved
——
9 Collision presence -
10 XMT -
11 Reserved
12 RCV -
13 Power (+12V)
14 Reserved
15 Reserved
Table 2-4 Power Supply Monitor Pin Assignments (RJ-45 Connector)
Pin Number Pin Name
1 Digital ground
2AACFAIL *_OUT
3 BACFAIL *_OUT
Table 2-3 LAN AUI Connector Pin Assignments (DB-15 Connector) (continued)
Pin Number Pin Name