ZyXEL Elite 2864 User Guide - Page 135

Chapter 12 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. The 2864L model supports 4-wire and 2-wire leased lines. 4-wire leased lines use one pair of wires to transmit data and a second pair to receive. 2-wire leased lines transmit and receive on the same pair of wires. Connecting to a Leased Line The leased-line model 2864L has a separate jack/terminal for a leased-line connection. The normal dial-up line models have only a phone jack for dial-up line connections. On these models, connect to a 2-wire leased line using the same jack. For the 2864L, the default line type is dial-up line (DL). It 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) for leased-line operation. You can set the 2864L 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 Appendix B. The rack mount model has both dial-up and leased-line terminal connectors on the rear panel of the rack it is mounted on. Line Type Menu 2W LEASED 4W LEASED 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 LEASED LINE on the rear panel. AT&L2 The modem is connected to a 4-wire leased line. Plug the line into the LEASED LINE jack. For the normal dial-up line only models, only 2-wire leased lines can be used and the same phone jack is used for both dial-up and leased-line connections. The dial backup feature is not available in this case. 12-1