JLCooper MLA-1 - Manual (Page 5)

MLA-1 / MLA-10
Installation/Operations Manual
Connections- MLA-10 to MLA-1
When attaching a MLA-10 to a MLA-1, wiring is very simple: Pin 1 on the MLA-10
goes to Pin 1 on the MLA-1 and so forth until pin 24.
If only 10 pair cable is used, skip past pins 19 and 20 on both ends. This
will provide two conductors of ground and two conductors of +9 VDC
power.
Connections- MLA-10 to MLA-10
When attaching two MLA-10's together, it is necessary to swap the In's versus
the Out's of the wiring. The connections will be as follows:
Unit Unit Unit Unit Unit Unit
A pin B pin A pin B pin A pin B pin
1 9 9 1 17 17
2 10 10 2 18 18
3 11 11 3 19 19 (optional)
4 12 12 4 20 20 (optional)
5 13 13 5
6 14 14 6
7 15 15 7
8 16 16 8
Clearly, the inputs and outputs have been swapped on one side. Note that pins
21 thru 24 are not attached at either end.
Failure to attach two MLA-10's as shown above will cause output to fight
output, and damage to both units will probably result.
We strongly recommend that a minimum of 22 AWG twisted pair
cable be used.
An example of this would be Belden #9747, which is non-
shielded 12 pair.
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