DIF102 - V.35 Interface Connector: DB15F Pin # Signal Description 1 fg frame ground 2 tda Transmit data A (output) 3 rts Request to Send (output) 4 rda Receive data A (input) 5   No Connection 6 reta Receive Timing A (input) 7 teta Transmit Timing A(input) 8 sg Signal Ground 9 tdb Transmit data B (output) 10 dtr Data Terminal Ready (output) 11 rdb Receive data B (input) 12 rlsd Receive line signal detect (input) 13 retb Receive Timing B (input) 14 tetb Transmit Timing B(input) 15 cts Clear To Send (intput)