CHAPTER 6: REMOTE DEVICE ALERTS
MDU Solutions
®
– UCrypt
®
Monitoring Server - Operation Manual
6-11
plant maintenance or other operations, or may happen as a result of an effected UCrypt system operation such as an ‘apply’
or reboot and does not require any attention if the UCrypt is able to recover from the problem by itself.
An Internal Issue
If this alert is sent frequently over a period of hours or days it is usually an indication of internal hardware/software issues within
the device and requires urgent attention.
6 .14 .6 Probable Causes
1. Plant conditions or an effected UCrypt operation (apply, reboot) have caused a QAM modulator channel to lose its
input stream momentarily.
2. The QAM modulator within the UCrypt is failing.
6 .14 .7 Next Steps
1. If the QAM loses bit rate occasionally but the UCrypt recovers from the problem without outside help, this may be
ignored, especially if the reoccurrence is very rare.
2. This alert, received frequently, may be an indication that there is an internal failure in the UCrypt.
6 .15 UCrypt Output QAM Channel Restarting Error
6 .15 .1 Refers to
PCR accuracy is abnormal at the output of the UCrypt program multiplexer .
When PCR accuracy is intolerable, the QAM
modulator restarts or re-acquires lock. This alert is sent at a threshold of 3 restarts per minute.
6 .15 .2 Repetition of Alert
This alert is sent every time that the threshold of the alert is exceeded in a one minute period.
6 .15 .3 Customer Symptoms
Customer experiences a very brief flicker impairment on all programs on the affected QAM at the time that the error condition
occurs. The impairment is so brief that it sometimes may only be noticed if there are many restarts per minute.
6 .15 .4 Urgency
Low - High.
6 .15 .5 Cases Where Alert is Likely a Result of:
Outside influence or normal operation
If only a rare occurrence of an output QAM restarting is reported, this could be considered normal and does not require any
attention if the UCrypt is able to recover from the problem by itself.
An Internal Issue
Repeated occurrences of an output QAM restarting, is usually indicative of excessive variation in PCR accuracy in the
multiplexed output stream being sent to the QAM modulator channel in question.
6 .15 .6 Probable Causes
1. Maintenance at the single program level (i.e. not broadband RF system maintenance) at the headend or intentionally
effected UCrypt operation such as programming changes.
2. Excessive variation in PCR accuracy in the multiplexed output stream being sent to the QAM modulator channel in
question indicating internal issues.
3. The output QAM modulator module internal to the UCrypt is failing.
6 .15 .7 Next Steps
1. If the QAM restarts occasionally but the UCrypt recovers from the problem without outside help, this may be ignored,
especially if the reoccurrence is rare and restarts are low (well under 5 per minute).
2. This alert, received frequently, could more likely be indicating an internal UCrypt software issue especially if many
restarts are being reported over a period of time.
6 .16 UCrypt SDV Lost Resolve Error
