one end of the X.21 line should be configured as a
Backup Master and the other codec should be
configured as a Backup Slave. This prevents both
codecs initiating the ISDN Backup, which can cause
a call conflict. The automatic ISDN Backup is
initiated by the Backup Master Codec following 50%
of synchronisation errors on the X.21 line. The X.21
Restore occurs following 10 seconds of continuous
error free, test data transmissions on the X.21 line.
The Backup Threshold and Restore Time settings
can be modified from these factory defaults using
the Backup Options menu.
NOTE: When operating in ISDN Backup Master/Slave mode,
it is advised that the DCE should carry X.21 termination
resistors.
Nailed ISDN
Nailed ISDN lines are available in some countries
for fixed point-to-point digital Transmissions. The
DIAL and HANG buttons are not required in this
mode and are therefore disabled. The audio format
used is defined within the ISDN Options menu.
The Nailed ISDN feature supports connectivity with
Hitachi Ta's in the following audio modes:
HIT-APTX:7K5 Stereo 128K (Hitachi mux)
HIT-APTX:15K2 Mono 128K (Hitachi mux)
Auxiliary Data Port
The Auxiliary Data Port can be configured for the
following modes:
Off,
9600bps,
4800bps,
2400bps,
9600bps(alt),
4800bps(alt),
2400bps(alt),
Relay Mode.
NOTE1: CTS output signal should be used for Flow Control
when Auxiliary Data is enabled.
NOTE2: All modes appended by “(alt)” are compatible with
codec’s manufactured by APT.
NOTE3: Relay mode enables two sets or bi-directional
contact closures. The connection details are shown in the
“Manager Input Port” and “Manager Output Port” sections of
this manual.
NOTE4: At present Aux data is not passed over IP
connections.
Alarm
Headroom can be configured to either level.
System Options
The user can modify the global System
configurations of the Codec.
Country Options
There are a number of ISDN parameters associated
with different countries and regions in the world.
NOTE : It is important that the ISDN line should be
disconnected from the Codec before any changes are made.
ISDN Network
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