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LINE PIN FUNCTIONS
The 8-pin LINE jack connects to the PSTN dial-up lines. Pin Functions
are:
Pin
1, 2
Not used
3 MI
Switch hook on exclusion key telephone not used in some systems
4 R
Rings side of telephone line
5 T
Tip side of telephone line
6 MIC
Switch hook on exclusion key telephone
7 PR
Data jack program position
8 PC
To data jack program resistor
AUX PIN FUNCTIONS
The 8-pin AUX jack allows a standard telephone or a leased line to be
connected to the modem. The pin functions for this jack are:
Pin
1, 2
Transmit pair - 4-wire leased line or Tx and Rx for 2-wire leased
line
4, 5
Ring and tip (respectively) of telephone line for a telephone
7, 8
Receive pair - 4-wire leased line
Phone Jack Descriptions
Function
Function
V.3400
Appendix B
B-1
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