8571—Technical description
NGT Transceiver System Technical Service Manual 339
4-wire interface
Four lines may be connected on the 4-wire interface. Line 1 is always connected, lines 2,
3 and 4 are optional. The receive audio for line 1 is applied to connector P3 pins 5 and 6
located on the Backplane PCB, and then via an interface cable to the 4-wire interface
assembly. Lines 2, 3 and 4 use connectors P4, P102, and P103 respectively.
The 4-wire interface consists of two isolating transformers (providing separate Tx and
Rx paths) and includes RF filter capacitors. The output of the Rx transformer connects
via an interface cable to the Tcvr Control connector mounted on the rear of the 8571.
Drawing 04-02691
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