User`s manual

it consists of six pins. POTS (plain old telephone services) use pins 3 and 4
for voice transmission. A telephone cable is shown below.
The A and B connectors on the rear of the Modem are RJ-11 connectors.
These connectors are wired identically. The RJ-11 connectors have six
positions, two of which are wired .The Modem uses the center two pins and
the pin out assignment for these connectors is presented below.
PIN MNEMONIC Function
1
NC Unused
2
NC Unused
3
TIP POTS
4
RING POTS
5
NC Unused
6
NC Unused
9