User Manual

VCom Inc.

AP5857 Manual; ml_ap5857_08 (Oct 2005)

Approved: R.B.

set threshold. There is some hysteresis with this function so that once the output is unmuted it will stay

unmuted until the output level drops several dB lower than the output mute threshold. Valid levels are

multiples of 0.5 dBmV. If the level is within the setting limits but the step size is not correct, the level will be

rounded to the nearest valid step size boundary.

To change the Upstream Output Auto Mute Threshold, type “3”. The local interface prompt will change to:

Output Auto Mute Threshold [10.0 to 55.0 dBmV](30.0)>_

Enter the new threshold or press ENTER to use the current value.

Upstream Output Alarm Threshold

This setting allows the user to set the upstream output alarm threshold level. Thresholds are used to provide

an alarm indication that the level is no longer within an acceptable range. Should the signal level exceed the

specified threshold level, an alarm condition will be triggered and the upstream output muted. Valid levels are

multiples of 0.5 dBmV. If the level is within the setting limits but the step size is not correct, the level will be

rounded to the nearest valid step size boundary.

To change the Upstream Output Alarm Threshold, type “3”. The local interface prompt will change to:

Output Alarm Threshold [17.0 to 50.0 dBmV](40.0)>_

Enter the new threshold or press ENTER to use the current value. It is recommended that the alarm

threshold be set no less than 5 dB (and preferrably 10 dB or more) above the expected level of the upstream

signal to accomodate expected CATV signal level variations.

Upstream Output Alarm Threshold Enable

This setting allows the user to enable threshold detection on the upstream output. Thresholds are used to

provide an alarm indication that the level is no longer within an acceptable range. Should the signal level

exceed the specified threshold level and threshold enabled, an alarm condition will be triggered and the

upstream output muted.

To change the Upstream Output Threshold Enable, type “4”. The local interface prompt will change to:

Output Alarm Threshold Enable[0 disable, 1 enable](1)>_

Enter the new values or press ENTER to use the current value.

5.6.5 General Settings

The General Settings Menu provides access to the general settings and options. To access this menu from

the Main Menu, type “5” to display the General Settings Menu.

Figure 5.9 General Settings Menu

*** VCom Inc. AP5857 General Settings ***

1)Change Password ***

2)User Message 112 Pine Street

3)Upgrade Firmware

4)Upgrade Modulator

5)Reset Unit

6)Load Factory Defaults

Antenna Gain (dB) 12.0

X)Exit

ENTER)Refresh

Select>_