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System Numbering Forms
Form 2b, System Numbering:
Digital Adjuncts
Maximum: 127 Adjuncts
Factory-Set
MFM
MLX
Log.
ID
2-digit 3-digit
Set Up
Source
Renumber to
SAA
T/R
Telephone
Ext. No.
7500B
Person, Location
Function, and Equipment Type
1
2
3
4
5
6
7
8
9
10
11
12
13
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
7300
7301
7302
7303
7304
7305
7306
7307
7308
7309
7310
7311
7312
7313
7314
14
15
16
17
18
19
20
21
22
23
24
25
26
27
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
7315
7316
7317
7318
7319
7320
7321
7322
7323
7324
7325
7326
7327
7328
7329
28
29
30
31
32
33
34
35
36
37
38
39
40
740
741
742
743
744
745
746
747
748
749
330
331
332
333
334
335
336
337
338
339
7330
7331
7332
7333
7334
7335
7336
7337
7338
7339
Figure B-2. Form 2b, System Numbering: Digital Adjuncts
B-4 Maintenance and Troubleshooting