User's Manual
ISO 9001:2000 Cert. N°4500/1
Version 1.1 SDT_ARK6_User_Manual_ENG_vATSC Page 109 of 206
Alarm
Description and limitations
Troubleshooting
Mode(2)
RF mask (1)
[DVB-T] MIP Err
MIP packets missing. This alarm’s RF OFF
mask should always be enabled.
Alarm raising limitations:
The monitoring of this alarm is enabled only
when the device has SFN modulation
enabled.
The monitoring of this alarm is disabled when
a No Input alarm is raised.
Check input signal
T
1
[DVB-T] PPS Phase
1PPS is not lock to a source reference
common to the network. This alarm is
available only when the frequency reference
is external.
Check 1PPS
Hardware fault
T
X
[DVB-T] SFN Alarm
Seamless improper working warning
This alarm is high when the Network delay is
greater than the Maximum delay or when the
internal counter, used to compute the System
delay is not locked to 1PPS. This alarm shall
always be enabled in the RF Off alarm mask.
Check cable connections
Check Network delay
Check 1PPS
Hardware Fault
T
1
[DVB-T] FE Not
Locked
Logical AND between FE TS lock and FE
demodulator ready (SyncStat equals to 6).
Check input signal and cable
T
X
[DVB-T] FE Squelch
Front-End Squelch level goes over the alarm
threshold.
Check input signal and cable
T
X
[DVB-T] FE Pre
Viterbi BER High
Front-End Pre Viterbi BER goes over the
alarm threshold.
Check input signal and cable
T
X
[DVB-T] FE SNR Low
Front-End SNR goes under the alarm
threshold.
Check input signal and cable
T
X