User's Manual Part 2

CL1TC-4 400W DVB-H Transmitter Alarms
Product Manual, Rev. 1 129
10.5 Modulator Alarms
Also see GPS alarms for the internal GPS. For the modulator temperature alarm see section
10.3
.
10.5.1 10 MHz Reference Loss
10 MHz Reference Loss
- Loss of 10 MHz Reference from GPS.
This alarm is only raised if the 10 MHz reference is completely lost which is more likely to
occur if there is a hardware failure. Even when the GPS is operating in holdover it still
transmits a 10 MHz signal, albeit the 10 MHz signal is no longer locked to the satellite
master reference.
Note: This alarm is only reported in SNF mode and is factory configured to mute the
modulator.
10.5.2 1PPS Reference Loss
1PPS
Reference Loss - Loss of One Pulse-per-second signal from GPS.
This alarm is only raised if the 1PPS reference is completely lost which is more likely to
occur if there is a hardware failure. Even when the GPS is operating in holdover it still
transmits a 1PPS signal, albeit the 1PPS signal is no longer locked to the satellite master
reference.
Note: This alarm is only reported in SNF mode and is factory configured to mute the
modulator.
10.5.3 Channel Sync Loss Happened
Cha
nnel Synch Loss Happened - set when the modulator cannot synchronize to the input
DVB-ASI transport stream.
10.5.4 No Input Data
No Inp
ut Data - set when the modulator has no input data in non-hierarchical mode, or
when the high priority input has no data in hierarchical mode.
10.5.5 LP No Input Data
L
P No Input Data - set when the modulator low priority input has no data in hierarchical
mode.