OPTIMOD SURROUND PROCESSOR INSTALLATION
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c) Connect the telephone line from the wall phone jack to the wall
connection icon on the back of the modem (modem in).
d) Connect the modem cable from the modem to the RS-232 port of the 8685.
e) Set the modem to A
UTO ANSWER and turn it on.
For 3Com/U.S. Robotics® 56kbps fax modem EXT, set dip switches 3, 5,
and 8 in the down position to activate the
AUTO ANSWER setting. All
other dip switches should be set to the up position.
E) If you have changed the INTERFACE TYPE from ASCII, reboot the 8685 to load
the RS-232 port’s PPP driver.
Synchronizing Optimod to a Network Timeserver
1. From the main menu, Locate to System Setup > Place/Date/Time > Time
Sync.
A) Use the S
YNC PROTOCOL control to choose either TIME PROTOCOL or SNTP.
• Select T
IME PROTOCOL if the Optimod is behind a firewall that does not pass
UDP packets. T
IME PROTOCOL selects the time protocol as described in the
standard RFC868. This method uses TCP on port 37.
• Select SNTP if your network timeserver supports the Simple Network Time
Protocol as described in standard RFC1769. This method uses UDP on port
123.
Ask your network administrator which protocols are available. SNTP is
slightly more accurate.
B) L
OCATE to SYNC PERIOD. Using the knob, choose how often your Optimod will
automatically update its internal clock to the timeserver you selected.
The choices are O
FF, 8 HOURS, and 24 HOURS.
If the connection to the timeserver fails (due to network overload or other prob-
lems), your Optimod will try once per hour to synchronize until it is successful.
C) L
OCATE to OFFSET. Using the knob, set it to the difference (in hours) between
your time zone and Universal Time (UTC).
UTC is also known as GMT, or Greenwich Mean Time.
• The value can range between –12 and +12 hours. If this value is set to 0,
your Optimod’s time will be the same as UTC.
• You can empirically adjust this value until the correct time for your location
is displayed after you synchronize your Optimod to a timeserver.
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