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. |
Leased Line Operation 35
