Manual Answer From Synchronous Mode; Chapter Eleven - Leased Line Operation; Leased Line Configuration - ZyXEL Communications U-1496 series User Manual

MANUAL ANSWER FROM SYNCHRONOUS MODE

Type `ATA' from the terminal (if set &M1) or press `A' on the IDLE SCREEN menu from the front
panel. On the U-1496E, press the VOICE/DATA switch with the ANS/ORG switch set to ANS.
CHANGE FROM SYNCHRONOUS MODE TO ASYNCHRONOUS MODE
Set the modem to asynchronous mode from the panel, or just reset from an asynchronous
profile. On the U-1496E, pressing the DATA/VOICE button while turning on the power will reset
all profiles to their factory presets. The active setting is factory default, which is asynchronous.
If modem is in &M1 mode, use AT command AT&M0 to change back to asynchronous mode.
If modem is in V.25bis command mode, entering the RST command will change modem to
asynchronous AT command mode.

Chapter Eleven - 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 U-1496
and U-1496R support 4-wire and 2-wire leased lines. 4-wire leased lines use a pair of wires to
transmit data and the second pair to receive. 2-wire leased lines transmit and receive on the
same pair of wires.
In some countries, a distinction is made between different kinds of leased lines:
Kind CCITT-Norm
Standard M1040 This is a line with specifications similar to standard telephone lines.
Attenuation in the frequency band 300 - 1700 Hz is smaller than from 1700 Hz to 3400 Hz.
Advanced M1025 The DCE uses a higher amplification for the 1700 Hz to 3400 Hz range
than for the 300 Hz to 1700 Hz range.
Special M1020 The same attenuation is used for the whole band width.
The U-1496 and U-1496R have a separate jack/terminal for leased line connection. U-1496E and
U-1496B have only a phone jack for dial-up line connection. You can only connect to the 2-wire
leased line on the same jack.

LEASED LINE CONFIGURATION

For the U-1496, 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 labelled 'LEASED LINE' (located at the rear of the
modem) for leased line operation. You can set the U-1496 for leased line operation by typing
commands from the terminal or by selecting it from the front panel. Leased line phone jack pin
assignments are shown in Appendix B.
The U-1496R has both dial-up and leased line terminal connectors at the rear panel of the rack it
is housed in.
LINE TYPE
Description