Cabletron Systems MMAC-Plus 9A000, User Manual

Page: 45 / 180

3-19
Switch Hardware
3.2.7 SFCS-1000 Common Equipment Card (CEC)
The CEC provided with the SFCS-1000 performs several functions. Because
each SCP contains an Ethernet port, a major function of the CEC is to provide
a single, unified Ethernet port connection for all of the SCPs. The CEC is also
responsible for monitoring the environmental conditions of the switch and
reporting this information to the SCPs. The CEC reports conditions such as
malfunctioning fans, overheated power supplies, and an overheated enclo-
sure.
3.2.7.1 CEC Front Panel
The front panel of the SFCS-1000 CEC includes the following features: alarm
relay contacts, CEC status LEDs, and an Ethernet port with four LEDS. These
features are illustrated in Figure 3.9. Refer to the following subsections for
detailed descriptions of these features.
Figure 3.9 - CEC Front Panel Status Indicators
3.2.7.2 Alarm Relay Contacts
Pins 1 and 2 are the contacts for AL1, and pins 3 and 4 are the contacts for
AL2. Although the pins are not actually labeled on an SFCS-1000 CEC, they
will be referred to as shown in Figure 3.10.
Figure 3.10 - Alarm Relay Contacts for AL1 and AL2
AL1
AL2
AL1 AL2
RX
LI
COL
POL
ETH
Pin 1 Pin 2 Pin 3 Pin 4
AL1 AL2