MultiModemII User Guide
72
Dial Backup and Leased Line Restoral
For four-wire leased line operation, the MT5600BL modem has dial backup, in
which the modem is connected to a standard dial-up line as well as to the leased
line. If the leased line fails, the originate modem automatically dials and connects to
the answer modem through the standard telephone network. While it is in dial back-
up mode, the MT5600BL periodically checks the leased line to see if it is operational.
If the line is operational, the modem then attempts to restore the leased line.
The dial-back timer, register S17, determines how long the modem waits after a
leased line failure before it attempts a dial backup connection. The S17 default set-
ting is one minute. During that minute, the originate modem tries to establish the
leased line link. If the leased line is established during that time, the S17 timer is
cleared and everything is back to normal. If the timer expires, the modem attempts a
dial backup connection. The purpose of the timer for the answer modem is to deter-
mine when it can accept a dial-up call. Dial-back starts only when both timers have
expired and the leased line is still down.
The restore timer, register S15, determines how frequently restoral attempts occur
when the modems are in dial backup mode. S15 can be set from 10 to 255 minutes in
one minute increments. The default value is 30 minutes.
Note:
Register S15 must be set identically on both the local and remote modems.
The dial backup number must be set from the front panel of the modem.
Dial Backup and Leased Line Restoral Setup
1. Connect a modular telephone cable to the LINE jack of an MT5600BL modem set
up for four-wire leased line operation. Connect the other end of the cable to a
standard dialup line jack.
2. Turn on the modem.
3. Starting at the STATUS screen, press the following buttons on the front panel:
â
,
â
,
à
,
â
,
à
,
à
,
à
. The ENTER NUMBER screen appears.
4. Press the
áß
or
â
button several times to select the first digit in the dial backup
telephone number.
5. Press the
à
button to go to the next digit in the number.
Note:
To backspace or to cancel an entry, press
à
several times.
6. The number can be up to 30 characters in length. Repeat steps 4 and 5 until the
number is entered, and then press the Enter button to store it. The DIAL BACK-
UP # STORED
screen appears.
7. Press the Enter button again to go to the DIAL BACKUP NUMBER screen.
Note:
Steps 8 through 15 are optional.
8. To change the default restore time, press
â
,
à
,
à
. The ENTER TIME IN
MINUTES
screen appears.
Содержание MT5600BA
Страница 1: ...Model MT5600BA Model MT5600BL Data Fax Modem User Guide...
Страница 7: ...Contents vii Appendix G ASCII Character Map 106 Index 107...
Страница 8: ...MultiModemII User Guide viii...
Страница 9: ...1 Introduction...
Страница 13: ...2 Quick Start...
Страница 24: ...MultiModemII User Guide 16...
Страница 25: ...3 Using the Front Panel...
Страница 28: ...MultiModemII User Guide 20 Trunks Limbs Branches Twigs Menu Overview...
Страница 39: ...4 AT Commands S Registers Result Codes...
Страница 64: ...MultiModemII User Guide 56...
Страница 65: ...5 Remote Configuration...
Страница 68: ...MultiModemII User Guide 60...
Страница 69: ...6 Callback Security...
Страница 76: ...MultiModemII User Guide 68...
Страница 77: ...7 Leased Line Operation...
Страница 82: ...MultiModemII User Guide 74...
Страница 83: ...8 Solving Problems...
Страница 91: ...Appendixes...
Страница 115: ...Index...