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Note that the call-processing time can be decreased by about three seconds if the
optional AC power command is used. In other words, add the #0 to all commands.
It acts as a terminating statement even without the power unit.
3.4.4 O
AC P
PTIONAL
The Modem Router Switch controls the AC power switch. The two units
communicate via the two outside conductors of the telephone cable. You should
have at least four conductors pinned in the cable.
If you don't use an AC power command in the dial string, the Modem Router
Switch sends a Power On message as it connects to the port if the power strip is
connected. After the local modem hangs up, it transmits a Power Off message to
the unit. (See #0, below.) This is the default.
In a modem/PC application, you might need to set your calling modem DCD wait
time (ATS7 = 255) for a long duration to give the PC and modem an opportunity
to boot up. The answer modem may require the AT&D2 setting in its power-up
configuration so it doesn't try and answer the line before the PC and the
application software have booted up.
You can use other Touch-tone commands that to override the automatic power
on/off mode. You must enter them through Touch-tone commands.
#0 = Power on and stay on while call is active, power off at hang-up (default).
#1 = Power on and stay on at hang-up.
#2 = Power off unit and the Modem Router Switch will hang up.
#3 = Power off and back on in 5 seconds (Reboot command). It will ring twelve
times before hanging up.
Outbound calls do not affect the status of the power control unit.
When the optional power strip is NOT being used (modem connected
directly to the Modem Router Switch), be sure that your modem does
not use Pins 2 and 5 on the Telco connector. Some modems may use
this to be compatible with older features, and the power control
signaling from the Modem Router Switch may interfere with this. Check
your modem manual or only connect Pins 3 and 4 in your cable.
If the Modem Router Switch loses power, the most recent AC power
command is kept in E2prom, and the most recent command is
transmitted to the power strip every 30 seconds.s
C
S
OWER
ONTROL
WITCH
WARNING
CHAPTER 3: Operation
21
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