Display the Input Level (Passport 4460)

1. To display, the input level of voice/fax channel B1 (for this discussion it is assumed that B1 is the Digital Voice Module at station 1), select Status/Statistics, Voice, and Voice from the navigation window.



You will see the Voice Channel Statistics window:



2. At the top of the window, click on Status. You will see the Voice Channel Status window:



The Input Level is displayed in the column next to the Network Connect column.

Observe the display, and note the input level for the channel. If the reading is more positive than -4 dBm, apply attenuation (negative gain) in the amount that this reading is above -4 dBm. If the reading is more negative than -4 dBm, add gain (6 dB maximum) until the reading is below -4 dBm. Normally, station circuits require an Input Level Gain setting of between +2 and +4 dB in order to obtain the -4 dBm reading. In most cases, you will not have to use a negative Input Level Gain setting (-1 dB or lower). CENTREX or PSTN lines normally require an Input Level Gain setting of +2 to +6 dB.

To adjust the input level for the FXO channel, set the Input Level Gain for the appropriate voice channel. To do that, use "Configure the Input Level Gain".