097-55501-01 Revision M – January 2009 TimeHub 5500 User’s Guide 189
Chapter 4 Testing and Configuring the TimeHub
Testing the NTP Cards
Using TL1 Commands
You can set the delay in terms of either feet or time using TL1 commands.
1. Enable a delay on the specified channels by issuing the TL1 command:
ED-EQPT::S0-OUTA-PG2:SV278:::CCDENB=Y;
This command enables delays on ports 21–40 of Output Group B in the Master
shelf.
2. Set a cable length of 100 feet by issuing the TL1 command:
ED-EQPT::S0-OUTA-PG2:SV279:::CBCOMP=100;
You can also set the delay in terms of time by issuing the TL1 command:
ED-EQPT::S0-OUTA-PG2:SV279:::CCDEL=80;
Range is
±
10
s. A value of 0 means that no additional offset is applied. Positive
values delay the CC output by the amount specified. Negative values advance
(make earlier in time) the CC output by the specified amount. To compensate for
cable delay, use a negative value. For example, if a Master shelf is providing a CC
output to a Remote shelf and the cable delay is 1.9
s, set the CCDEL value to
-1900 (nanoseconds). The alignment of the CC signal(s) at the Remote shelf will
be matched with a non-delayed CC output signal generated at the Master shelf.
Testing the NTP Cards
Perform the tests in this section to verify that the NTP Server card and the NTP
Output Connector module are operating correctly.
LED Indications
The LEDs on the NTP Server card illuminate in the following sequence when you
install the NTP Server card:
The Active/Standby (A/S) LED blinks after 20 to 30 seconds. This indicates that
the NTP Server card has successfully booted and that this is the active NTP
Server card
The Stratum 0 (ST0) LED illuminates when a TimeSource 3x00 TOD signal is
active and connected to the NTP Output Connector module
The SFP A LED illuminates and blinks with activity on the Ethernet port
The SFP B LED illuminates and blinks with activity on the Ethernet port
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