I have a real Motorola L1159A MRTI complete with all cables. I removed it from a working MSF CXB station so I know it's intact. This page documents the MSF5000 MRTI-to-radio cable that plugs into the 14-pin MRTI connector on the SSCB.

Motorola supplies the MSF5000 cable as their model C719-AB-SP phone patch interface option kit. The MRTI manufacturer's (Instrument Associates, Inc.) manual has nothing else about this cable.

There are multiple red wires on the MRTI end of the cable, but I don't know where these are spliced together, as each end of the cable has had shrink tubing applied.

MSF5000 SSCB 14-pin MRTI Connector J802:

Pin	Color	Signal Name
1	Red	Logic Ground
2	Brown	PL Strip
3	- - - - -	Logic Ground
4	Orange	Monitor
5	White	PTT
6	- - - - -	Logic Ground
7	Pink	Audio Ground
8	Tan	Audio Input
9	Gray	Logic Ground
10	Violet	Audio Output
11	Blue	RX Carrier
12	Black	Inhibit
13	- - - - -	Audio Ground
14	Yellow	Aux. Indicator

L1159A MRTI RIMX-D Board Connector P12:

Pin	Color	Signal Name
1	Brown	TX PL Strip
2	Red	TX PL Strip Gnd
3	Orange	Monitor
4	Red	Monitor Gnd
5	Red	PTT Gnd
6	Blue	RX Carrier
7	Violet	RX Audio
8	Gray	RX Audio Gnd
9	White	PTT
10	- - - - -	PL Detect
11	Tan	TX Audio
12	Pink	TX Audio Gnd

L1159A MRTI RIMX-D Board Connector P11:

Pin	Color	Signal Name
1	- - - - -	Aux. RX Audio
2	- - - - -	Aux. RX Audio
3	Black	Inhibit
4	Yellow	Aux. Carrier