Mike's PBX Cookbook

TCM Port (RJ21) Pinout

TCM ports are found on IP500 Digital Station 16A/30A external expansion modules, and supported by IP500 V2 systems running IP Office Release 7.0 and higher. TCM ports are used for supported M-Series and T-Series digital stations. Also used for 4100 and 7400 Series phone support by connection to a Digital Mobility Solution system.

Cable lengths up to 305 m (1000 ft) using 0.5mm (24AWG) wires do not require a power booster. For TCM phones, lengths up to 790 m (2600 ft) are supported if an auxiliary power supply booster is used.

1st RJ21 Connector 2nd RJ21 Connector
Pin Colour Wire colour Port
26
1
White-Blue
Blue-White
1
27
2
White-Orange
Orange-White
2
28
3
White-Green
Green-White
3
29
4
White-Brown
Brown-White
4
30
5
White-Slate
Slate-White
5
31
6
Red-Blue
Blue-Red
6
32
7
Red-Orange
Orange-Red
7
33
8
Red-Green
Green-Red
8
34
9
Red-Brown
Brown-Red
9
35
10
Red-Slate
Slate-Red
10
36
11
Black-Blue
Blue-Black
11
37
12
Black-Orange
Orange-Black
12
38
13
Black-Green
Green-Black
13
39
14
Black-Brown
Brown-Black
14
40
15
Black-Slate
Slate-Black
15
41
16
Yellow-Blue
Blue-Yellow
16
42
17
Yellow-Orange
Orange-Yellow
Not Used
50
25
Violet-Slate
Slate-Violet
 
Pin Colour Wire colour Port
26
1
White-Blue
Blue-White
1
27
2
White-Orange
Orange-White
2
28
3
White-Green
Green-White
3
29
4
White-Brown
Brown-White
4
30
5
White-Slate
Slate-White
5
31
6
Red-Blue
Blue-Red
6
32
7
Red-Orange
Orange-Red
7
33
8
Red-Green
Green-Red
8
34
9
Red-Brown
Brown-Red
9
35
10
Red-Slate
Slate-Red
10
36
11
Black-Blue
Blue-Black
11
37
12
Black-Orange
Orange-Black
12
38
13
Black-Green
Green-Black
13
39
14
Black-Brown
Brown-Black
14
40
15
Black-Slate
Slate-Black
Not Used
41
16
Yellow-Blue
Blue-Yellow
42
17
Yellow-Orange
Orange-Yellow
50
25
Violet-Slate
Slate-Violet
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