Symmetricom TimeSource 500, User Manual

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TimeSource 3500
Installation
097-72050-01 Issue 7: August 2003
S S S S S S S S S S S S S S S S S S S S S S S S S S S S S
3
28 If the results of Step 19 indicate the antenna cable delay and elevation mask
are set as desired, skip to Step 29. Use the Edit Equipment command to set the
length of cable between the antenna and the TimeSource 3500 Shelf. This
number should have been recorded during installation. Use the same command
to set the antenna elevation mask angle.
ED-EQPT::GPS:<ctag>:::ANTCBLDLY=a,ANTELEVMASK=b;
a= antenna cable delay in meters (a = 0 to 330)
b= antenna elevation mask angle in degrees (b = 0 to 45) (see note
below)
Note:
The antenna elevation mask is that portion of the sky from which the
TimeSource 3500 masks out satellite signals, measured as an angle of
elevation from the horizon. Reflections or other anomalies may disturb signals
received from an area of the sky that has obstructions, usually the area near the
ground. Masking that part of the sky may allow the receiver to acquire GPS
signals more quickly and accurately. Factory setting is 10.
29 If not using the TOD output, skip to Step 30. Use the Edit Equipment command
to set the TOD output.
ED-EQPT::TS3500:<ctag>:::TOD=b;
b= TOD format (b = Cisco or NTP4)
30 Use the Edit Equipment command to allow or inhibit alarm conditioning on the
outputs. Inhibiting the alarm conditioning forces the TimeSource 3500 to
continue to output valid timing signals while in major alarm. This may be useful
when testing, troubleshooting, or in installations where a TimeSource 3500
that is in major alarm may produce better timing signals than other sources (for
example, offices without additional holdover clocks in a distribution shelf).
ED-EQPT::TS3500:<ctag>:::ALMCOND=b;
b= alarm conditioning of the outputs (b = ALW or INH)
Procedure H. Power-Up (cont’d)
Step Procedure