Owner`s manual
33
Appendix A - Safety Requirements
-21 Series Connector Pinouts
Three 50-pin connectors are used on the -21 series rack;
they are located at the top of the backplane. The Dial-up/2-
Wire Leased connector is to the left (as viewed from
behind the chassis), the 4-wire Receive connector is in the
center, and the 2-Wire Leased/4-Wire Transmit connector
is on the right side of the backplane. Pinouts for each
connector are shown below.
17
18
19
20
21
22
23
24
25
42
43
44
45
46
47
48
49
50
50 POSITION CONNECTOR
J17
1 4W X TIP1
2 4W X TIP2
3 4W X TIP3
4 4W X TIP4
5 4W X TIP5
6 4W X TIP6
7 4W X TIP7
8 4W X TIP8
9 4W X TIP9
10 4W X TIP10
11 4W X TIP11
12 4W X TIP12
13 4W X TIP13
14 4W X TIP14
15 4W X TIP15
16 4W X TIP16
4W X RING1 26
4W X RING2 274W X RING2 27
4W X RING3 28
4W X RING4 29
4W X RING5 30
4W X RING6 31
4W X RING7 32
4W X RING8 33
4W X RING9 34
4W X RING10 35
4W X RING11 36
4W X RING12 37
4W X RING13 38
4W X RING14 39
4W X RING15 40
4W X RING16 41
17
18
19
20
21
22
23
24
25
42
43
44
45
46
47
48
49
50
50 POSITION CONNECTOR
J17
1 4W R TIP1
2 4W R TIP2
3 4W R TIP3
4 4W R TIP4
5 4W R TIP5
6 4W R TIP6
7 4W R TIP7
8 4W R TIP8
9 4W R TIP9
10 4W R TIP10
11 4W R TIP11
12 4W R TIP12
13 4W R TIP13
14 4W R TIP14
15 4W R TIP15
16 4W R TIP16
4W R RING1 26
4W R RING2 27
4W R RING3 28
4W R RING4 29
4W R RING5 30
4W R RING6 31
4W R RING7 32
4W R RING8 33
4W R RING9 34
4W R RING10 35
4W R RING11 36
4W R RING12 37
4W R RING13 38
4W R RING14 39
4W R RING15 40
4W R RING16 41
1 TIP 1
2 TIP 2
3 TIP 3
4 TIP 4
5 TIP 5
6 TIP 6
7 TIP 7
8 TIP 8
9 TIP 9
10 TIP 10
11 TIP 11
12 TIP 12
13 TIP 13
14 TIP 14
15 TIP 15
16 TIP 16
17
18
19
20
21
22
23
24
25
1 TIP 1
2 TIP 2
3 TIP 3
4 TIP 4
5 TIP 5
6 TIP 6
7 TIP 7
8 TIP 8
9 TIP 9
10 TIP 10
11 TIP 11
12 TIP 12
13 TIP 13
14 TIP 14
15 TIP 15
16 TIP 16
17
18
19
20
21
22
23
24
25
1 TIP 1
2 TIP 2
3 TIP 3
4 TIP 4
5 TIP 5
6 TIP 6
7 TIP 7
8 TIP 8
9 TIP 9
10 TIP 10
11 TIP 11
12 TIP 12
13 TIP 13
14 TIP 14
15 TIP 15
16 TIP 16
17
18
19
20
21
22
23
24
25
RING1 26
RING2 27
RING3 28
RING4 29
RING5 30
RING6 31
RING7 32
RING8 33
RING9 34
RING10 35
RING11 36
RING12 37
RING13 38
RING14 39
RING15 40
RING16 41
42
43
44
45
46
47
48
49
50
50 POSITION CONNECTOR
J17
DIAL UP / 2 WIRE
LEASED
CONNECTOR
4 WIRE
RECEIVE
CONNECTOR
2 WIRE LEASED /
4 WIRE TRANSMIT
CONNECTOR