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Chapter 4 - Leased Line Operation
31
Multi-Tech Systems, Inc. MT5600BA/BL Series User Guide (S000276E)
Dial BDial B
Dial BDial B
Dial B
aa
aa
a
cc
cc
c
kup and Lkup and L
kup and Lkup and L
kup and L
ee
ee
e
ased-Line Rased-Line R
ased-Line Rased-Line R
ased-Line R
estoesto
estoesto
esto
rr
rr
r
alal
alal
al
For four-wire leased line operation, the MT5600BA-V.92 modem has a dial backup capability, 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 backup mode, the modem 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. If the modem
detects that it is not connected to the standard telephone network when the leased line fails, it
immediately switches to leased line restoral.
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 setting 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 determine 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. A value of 0
disables dial backup. The default value is 30 minutes.
Note: Register
S15
must be set identically on the local and remote modems.
The dial backup number must be set from the front panel of the modem.
Dial BDial B
Dial BDial B
Dial B
aa
aa
a
cc
cc
c
kup and Lkup and L
kup and Lkup and L
kup and L
ee
ee
e
ased Line Rased Line R
ased Line Rased Line R
ased Line R
estoesto
estoesto
esto
rr
rr
r
al Setal Set
al Setal Set
al Set
upup
upup
up
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:
ÈÈ
ÈÈ
È,
ÈÈ
ÈÈ
È,
ÆÆ
ÆÆ
Æ,
ÈÈ
ÈÈ
È,
ÆÆ
ÆÆ
Æ,
ÆÆ
ÆÆ
Æ,
ÆÆ
ÆÆ
Æ. The ENTER NUMBER screen appears.
4. Press the
ÇÇ
ÇÇ
Ç
ÅÅ
ÅÅ
Å
or
ÈÈ
ÈÈ
È button several times to select the first digit in the dial backup
telephone number.
5. Press the
ÆÆ
ÆÆ
Æ button to go to the next digit in the number.
Note: To backspace or to cancel an entry, press
ÆÆ
ÆÆ
Æ 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.