Jk-audio PBXport User Manual download pdf (Page 9)

Operation (continued)

Optional Jumper Settings

If your unit was purchased after December 2007, there are

two jumpers located on the circuit board inside the PBXport

that affect your incoming audio. The jumper at J10 allows you

to completely disable both the handset microphone and

speaker when the Online button is pressed. The factory de-

fault closed position disables only the handset microphone

when the Online button is pressed. This will have no affect on

normal telephone operation.

If the incoming audio level from your telephone is too high

and you are consistently lighting the red –3 dB Receive LED,

first try decreasing the volume using the controls on the base

of your telephone. If you still cannot drop the incoming audio

level enough, you may need to change jumper J11. There

are three possible settings to adjust Caller Receive level:

Pins 1 & 2 closed = 0 dB (factory default)

Pins 2 & 3 closed = -10 dB

Pins 1-3 left open = -20 dB

To change the jumper settings, first disconnect power from

the PBXport, then remove the top cover on the unit. Locate

the appropriate jumper on the printed circuit board and set to

the desired position.

WARNING! The AC cable must be unplugged from

the back of PBXport anytime the case is opened. Fail-

ure to follow these instructions could potentially result

in injury or death.

ATTENTION! Be sure to use an ESD grounding

wrist strap when changing this jumper setting. If you

do not have a wrist strap, keep one hand on the

PBXport case at all times while changing the jumper

with the other hand. These measures are required to

prevent electrostatic discharge from damaging the

unit.

Operation (continued)

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

No comments

Jk-audio PBXport User Manual Page 9