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1.3 Cabinet, Relay and Component Identification
For identification purposes, the Main Control Cabinet is defined as that part of the 1816 system that
houses the main processor control board, and at least one, but not more than five, relay boards.
Auxiliary Cabinets are defined as that part of the 1816 system that houses one decoder board, and at
least one, but not more than eight, relay boards. Each cabinet is identified with a label and the system
relays that it houses. There can only be one Main Control Cabinet per 1816 system, however, there
can be several Auxiliary Cabinets per system. Auxiliary cabinets start with cabinet 0, and increase
sequentially.
1.3.1 Main Control Cabinet
If the 1816 system is interfacing with 60 or less phone lines, the Garden Style Cabinet will be used
since no auxiliary cabinets will be required. If the 1816 system is interfacing with more than 60, but
less than 156 phone lines, then the larger 1816 Main Control Cabinet will be used. The large main
control cabinet houses the main processor board and 5 relay boards mounted in the cabinet. A decoder
board and up to 8 relay boards can be mounted on the door of this cabinet, which is then identified (the
door side) as Auxiliary Cabinet 0.
1.3.2 Auxiliary Cabinets
Additional cabinets will be required if the 1816 system is interfacing with more than 156 phone lines.
Each cabinet physically houses two Auxiliary Cabinets; 1 Auxiliary Cabinet (decoder board and up to 8
relay boards) is housed in the cabinet and a second Auxiliary Cabinet is housed on the door side. Since
Auxiliary Cabinet 0 is housed in the Main Control Cabinet, these two Auxiliary Cabinets are labeled as
Auxiliary Cabinet 1 and Auxiliary Cabinet 2. Auxiliary cabinets are numbered sequentially as additional
cabinets are added.
Cabinet, Relay Board & System Relay Numbering Matrix
Relay
Cabinet
Boards
Main
1 - 5
Auxiliary
Relay
Cabinets
Boards
0
6 – 13
1
14 – 21
2
22 – 29
3
30 – 37
4
38 – 45
5
46 – 53
Page 14
System
Relay #'s
0000 - 0059
System
Relay #'s
0060 - 0155
0156 - 0251
0252 - 0347
0348 - 0443
0444 - 0539
0540 - 0635
Auxiliary
Relay
Cabinets
Boards
6
54 – 61
7
62 – 69
8
70 – 77
9
78 – 85
10
86 – 93
11
94 - 99
1816-065-L-11-14
System
Relay #'s
0636 - 0731
0732 - 0827
0828 - 0923
0924 - 1019
1020 - 1115
1116 - 1199
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