Connector and Adapter Detail
External Alarm Connector
A-17
PN 76.8820IM30-A
Tellabs 8820 Multi-service Switch Router System Installation
External Alarm Connector
The DB-25 connector supports three visual alarm outputs, three audible alarm outputs, and
an ACO input. Pinouts for the external alarm interface are shown in
Table A-12
External Alarm Pinouts
Pin
Number
Signal
Pin
Number
Signal
Pin
Number
Signal
1
ACrit N.O.
10
N/C
19
VCrit Com
2
ACrit Com
11
N/C
20
VMaj N.C.
3
AMaj N.O.
12
N/C
21
VMin N.C.
4
AMin N.O.
13
Ext ACO
22
VMin Com
5
AMin Com
14
ACrit N.C.
23
N/C
6
VCrit N.O.
15
AMaj N.C.
24
N/C
7
VMaj N.O.
16
AMaj Com
25
Ext_ACO_R
8
VMaj Com
17
AMin N.C.
9
VMin N.O
18
VCrit N.C.