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B–1
Appendix B
PHONE JACK PIN ASSIGNMENTS
Most models of the ZyXEL 2864 modem series feature two RJ11 phone jacks, one
for the dial-up line connection (LINE) and one for an optional connection to a
telephone set (PHONE). The signals on these pins are:
The signals A and A1 are used with the KTS (Key Telephone System). They may or
may not be supported depending on the jumper option in the modem. For the
rack-mount model, the line terminals are located on the backplane of the rack chas-
sis. The model 2864L also features a leased-line jack. This jack is an 8-pin JM8 type
jack. The signals on its pins are:
A 4-wire leased-line connection uses pins 1 and 2 for transmission and pins 7 and 8
for reception. 2-wire leased-line connections use pins 1 and 2 for both transmission
and reception.
1A
2 RING
3 TIP
4A1
1 Transmit Signal (R1)
2 Transmit Signal(T1)
3 not connected
4 not connected
5 not connected
6 not connected
7 Receive Signal(T)
8 Receive Signal(R)