ZyXEL Communications U-336R, User Manual

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Leased Line Operation 35
5
Leased Line Operation
A leased line is a permanent telephone line connection between two
fixed points. It can be dedicated copper wires or a leased telephone
circuit from the telephone company. Four-wire leased lines use one
pair of wires to transmit data and a second pair to receive. Two-
wire leased lines transmit and receive on the same pair of wires.
The U-336R supports 2 and 4-wire leased lines while the U-336RE
supports 2-wire leased lines.
Connecting to a Leased Line
Your modem default line is a dial-up type (DL) which includes a
separate leased-line jack. The leased line must be connected to the
jack labeled LEASED LINE (located at the rear of the modem).
You can set your modem for leased-line operation by typing
commands from the terminal or by selecting it from the front panel.
The leased-line phone jack pin assignments are shown in Chapter
12 Terminal Pinouts.
Line Type Setting
AT-Command Description
AT&L1 The modem is connected to a 2-wire leased line;
the line plug should be plugged into the jack
assigned DIALUP for RE model or leased line
for R model on the rear panel.
AT&L2 The modem is connected to a 4-wire leased line.
Plug the line into the LEASED LINE jack.