4-Band VDSL CO/CPE MODEM USER’S MANUAL Ver. A.2
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Standard telephone wire of any gauge or flat type, twisted or quad is used to connect the modem to the telephone network. A
telephone cable typically consists of three pairs of wires, one of which is used for transmission. The connector at the end of the
telephone cable is called an RJ-11 connector and it consists of six pins. POTS (plain old telephone services) use pins 3 and 4 for
voice transmission. A telephone cable is shown in Figure 6.
A
B
Figure 6: Telephone cable
Connectors A and B on the rear of the modem are RJ-11 connectors. These connectors are identically wired. The RJ-11 connectors
have six positions, two of which are wired. The Modem uses the center two pins. The pin out assignment for these connectors is
presented in Table 5.
Pin#
MNEMONIC
FUNCTION
1
NC
Unused
2
NC
Unused
3
TIP
POTS
4
RING
POTS
5
NC
Unused
6
NC
Unused
Table 5: RJ-11 Pin out Assignments
