NexLog Recorder User Manual v2.2.0
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10: specifies pin pairs 3+4 (PC6)
11: specifies pin pairs 1+2 (PC7)
PBX Digital Sync Errors:
This column is only important for Digital PBX tapping
boards; it is used for installation and troubleshooting. The data will look like
this: 1.1 / 0.66 [2,1,0]. The first two numbers are signal levels in volts. The first
of the pair is the level of the signal coming from the PBX, and the second is the
signal level coming from the phone set.
The three numbers inside the brackets are the total error counts for the channel
since the last reconfiguration or restart:
Sync errors are more general errors on the channel as a whole.
PBX errors are errors in the signal from the PBX.
Phone errors are in the signal from the phone.
These errors can signify problems and can affect recording: if the errors are
increasing at a steady rate, it indicates that there is a problem with the
telephone line connected to the recorder. However, if the error counts aren’t all
zero but do not increase, it might not be an indication of a serious issue: for
example, someone may have unplugged and then plugged back in a phone.
Problems can be caused by:
Line issues (bad taps, multiple taps, line lengths, tap lengths, marginal
wiring between the phone and PBX).
Unsupported phone set or line card.
The wrong PBX is set in the board configuration.
Steps for Setting Levels, Thresholds, and Hold Times
It is undesirable for single conversations to be broken up into multiple calls.
There is a lag between each stop and start, so some of the conversation will be
lost. Setting levels and thresholds properly will help you avoid this condition.
This applies to channels set for VOX detect.
If you are seeing this condition, or if you simply want to check how well the
default parameters match your facility, try this procedure:
Disable AGC
Set the Input Gain. It should be set with signals that best match what will
be seen during normal operation. Watch the values and adjust the gain so
that the current value ranges between -6dB and -1dB while a signal is
present.
Enable AGC (if desired). Not recommended for broadcast recording,
recommended for communications or telephone channels.
