Case Communications syncro 1496, Reference Manual

Page: 55 / 192

Factory Configuration 11
Operation : 4-wire leased line, V.33 TCM, auto dial-backup and
restoral.
Rates : Primary 14400, fallback 12000.
V.24 : Normal.
Commands : AT via the command port.
Typical Use : Initiation of dial backup is automatic on loss of signal.
The telephone number for automatic dial backup must be
stored in the modem in N8 of the dialling-end modem,
along with the required PSTN backup configuration.
The remote modem should also use factory configuration
11. No number is stored in N8, indicating that it is the
answering end of the link. The PSTN backup
configuration should be loaded into directory location
N10.
With user configuration Z1 or Z2 stored alongside the dial
backup number, once connected the user configuration is
loaded, typically V.32bis 14400 bps, and transmission is
switched to the dialup line. When the leased line has been
restored and checked, data automatically reverts to V.33
leased line operation and the dialup line is disconnected.
For full details on dial backup while operating in V.33
mode, see Section 6.4 of this manual.
X450-310851 Issue 2 4-19 Rev.0