User Manual

VCom Inc.

AP5857 Manual; ml_ap5857_08 (Oct 2005)

Approved: R.B.

Upstream Output Threshold Alarm

When active and the alarm is enabled, it indicates that the upstream output level is higher than the upstream

output alarm threshold value. The upstream signal is muted under this condition. It will indicate “OK” or

“Threshold Exceeded”.

Downstream CATV Frequency

Indicates the frequency of the signal from the CATV strand to which the the radio is currently tuned.

Downstream RF Frequency

Indicates the frequency of the RF transmit signal to which the radio is currently set.

Downstream Transmit EIRP Setting

Indicates the current downstream transmit power setting, expressed as Effective Isotropic Radiated Power

(EIRP).

Downstream Output

Indicates current state of the downstream output. There are three valid output states: Muted (Manual)

indicates that user has forced the output to be disabled, Muted (Alarm) indicates that the output has been

muted by an alarm condition, Unmuted indicates that the output is enabled.

Downstream Modulation

Indicates the selected downstream modulation. It will indicate 64QAM or 256QAM.

Downstream Interleaver

Indicates the selected downstream interleaver setting. Valid settings are 128,1; 64,2; 32,4; 16,8; and 8,16.

See the downstream menu section for details on interleaver settings.

Downstream Demodulator Status

Indicates the lock status of the downstream demodulator. It will display Locked or Not Locked. If the

demodulator is not locked, this may indicate that there is no valid signal or the signal quality is too low for

proper operation.

Downstream Demodulator SNR

Indicates the estimated downstream Signal to Noise Ratio as seen by the demodulator. The best signals will

result in SNR values of 35 dB or more, however good operation will be maintained to SNR values of 30 dB or

less. Lower SNR values indicate poor signal conditions, which may include interference or low signal level.

The indicated SNR is an instantaneous reading, so the value of the SNR will vary from reading to reading.

Upstream Gain

Indicates the current upstream gain setting.

Upstream Level

Indicates the latest reading of the upstream signal level at the IF port. Pushing E

NTER will update the screen

with a new measurement.