Mcti-8L (Loop Reversal) Connection - Motorola McIAS 1610 Series System Manual

3.3 McTi-8L (Loop Reversal) Connection

The McTi-8L (Loop Reversal) board provides a 2-wire reverse loop circuit. Each
channel goes off-hook upon detection of loop current and reverses the tip and ring
polarity. Channel 1 on this board can be used for call-in system administration and
Channel 8 has speaker output capability.
An analog connection from a McTi-8L board to the telco is made via male 50-pin
connectors on the exterior backplane. The McIAS 1607 and 1685 analog interface
connectors are identified as J3 and J4 which together handle a maximum of 8
channels. The McIAS 1610 connectors are J3, J4, J6 and J7 which together handle
up to 24 channels. As an option, an analog connector block can be used to make a
connection from the backplane connectors to the telco end.
McTi-8L pin connections are shown below.
Pin
Number Connect to
50 Not used
49 Not used
48 Not used
47 Tip (Channels 18,20,22,24)
46 Speaker B (Channel 24)
45 Not used
44 Not used
Tip (Channels 17,19,21,23)
43
42 Not used
41 Not used
40 Not used
39 Tip (Channels 4,8,12,16)
38 Speaker B (Channels 8,16)
37 Not used
36 Not used
35 Tip (Channels 3,7,11,15)
34 Not used
33 Not used
32 Not used
31 Tip (Channels 2,6,10,14)
30 Not used
29 Not used
28 Not used
27 Tip (Channels 1,5,9,13)
26 Not used
Pin
Number
25
24
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
Table 3-2
McTi-8L Pin Connections
36
Connect to
Not used
Not used
Not used
Ring (Channels 18,20,22,24)
Speaker A (Channel 24)
Not used
Not used
Ring (Channels 17,19,21,23)
Not used
Not used
Not used
Ring (Channels 4,8,12,16)
Speaker A (Channels 8,16)
Not used
Not used
Ring (Channels 3,7,11,15)
Not used
Not used
Not used
Ring (Channels 2,6,10,14)
Not used
Not used
Not used
Ring (Channels 1,5,9,13)
Not used