Characteristic Spec/Value
Battery voltage -31 V dc ±10%
Maximum loop length 900 m (3000 ft)
Minimum loop current 25 mA
Current limit 39 mA
Ringing voltage at T/R 50 Vrms
Maximum ringing load 2 REN
Ringing frequency 20 Hz
Ring trip time limit 150 ms
ICS external lines connector
Pin Wire color Port Service Equipment
41 Yellow-Blue ---- ---- ----
16 Blue-Yellow ---- ---- ----
42 Yellow-Orange ---- T emergency telephone
17 Orange-Yellow ---- R emergency telephone
43 Yellow-Green ---- ---- ----
18 Green-Yellow ---- ---- ----
44 Yellow-Brown ---- ---- ----
19 Brown-Yellow ---- ---- ----
45 Yellow-Slate 117 T I-ATA
20 Slate-Yellow 117 R I-ATA
46 Violet-Blue ---- ---- ----
21 Blue-Violet ---- ---- ----
47 Violet-Orange ---- ---- ----
22 Orange-Violet ---- ---- ----
48 Violet-Green ---- Ground Music
23 Green-Violet ---- Music Music
49 Violet-Brown ---- Make External Page
24 Brown-Violet ---- Common External Page
50 Violet-Slate ---- T Page
25 Slate-Violet ---- R Page
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