Verilink Net Engine (3150-30626-001) Product Manual - Manual (Page 167)

NetEngine IAD User Guide
Voice Path Configuration 148
Setting
Loop Gain
If the IAD feeds telephone circuits into a legacy PBX or other equipment
that defines transmit and receive levels to the network, the loop gain value
must match the value of the circuit it supplies—the levels set and
determined by the PBX or terminating equipment manufacturer.
You must also change the loop gain value if there is a decrease in power
between the signal transmitted and the signal received due to loss through
equipment, lines or other transmission devices, degradation in service or
customer perception.
To set loop gain values, type G to display the Configure Loop Gain menu:
Figure 7–10. Loop Gain Menu
Type the option for the command to execute and proceed to the
appropriate section.
Setting Loop Gain for All Ports
To set the Transmit (-9dB to 3dB—default -2dB) and Receive (-9dB to
3dB—default -4dB) Loop Gain values for all ports:
1. Type 1 to select Set Loop Gain for all ports.
2. The IAD displays this prompt for the transmit loop:
Enter Transmit Loop Gain for all ports (range -9dB/
3dB) [-2dB]:
Type the value (include a dash for negative values) and press Enter.
3. The IAD displays this prompt for the receive loop:
Enter Receive Loop Gain for all ports (range -9dB/
3dB) [-4dB]: -5
Type the value (include a dash for negative values) and press Enter.
4. The IAD saves the loop gain values and displays the menu.
5. Press Escape to return to the Voice Configuration menu and continue
voice path configuration.
6. Reset the IAD (page 15 ) when you finish voice path configuration.
NOTE Loop gain values should only be set by your Network
Administrator.
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Configure Loop Gain Menu
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Current Control Mode = AUTO Control Mode
1. Set Loop Gain for all ports
2. Display current Loop Gain settings
3. Configure Loop Gain setting per port