RTS DSI 2008 manual Pin Connection Connector Type 9-pin male D-subminiature

Audio Connections for the Other 4-wire Communications Systems

1.Construct 9-pin or RJ-11 cables to connect from the 4-wire system to the DSI 2008. To connect to the System A hybrid, use either J2A or J3A; for the System B hybrid, use either J2B or J3B. Pin connections are as follows:

9-Pin Connection

Connector Type: 9-pin male D-subminiature

Pin 1	No connection
Pin 2	No connection
Pin 3	No connection
Pin 4	Balanced Audio + 4-wire output
Pin 5	Balanced Audio - 4-wire output
Pin 6	No connection
Pin 7	Balanced Audio - 4-wire input
Pin 8	Balanced Audio + 4-wire input
Pin 9	No connection

RJ-11 Connection

Connector Type: RJ-11 plug

Pin 1	No connection
Pin 2	Balanced Audio + 4-wire input
Pin 3	Balanced Audio + 4-wire output
Pin 4	Balanced Audio - 4-wire output
Pin 5	Balanced Audio - 4-wire input
Pin 6	No Connection

2.On the DSI 2008 front panel, set the 4W LEVEL REF SEL switches to the position which most closely matches the audio input and output levels of your 4-wire system. If you don’t know the levels, select the +8 dB position for now.

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