Bedienungsanleitung Polycom Vortex EF2201 (Seite 24 von 43) (Englisch)

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TROUBLESHOOTING

VORTEX EF2201 Reference Manual 22 Technical Support: 800.932.2774

ROUBLESHOOTING

ESIDUAL

CHO

If there is residual echo in the system, it may not be a problem with the EF2201.

There are different types of echoes that come from different directions, and the

EF2201 is only designed to remove one of them. The first step is to make sure the

echo isn’t caused by something else. Then, the EF2201 can be adjusted to remove

any residual echo coming from the hybrid.

Identifying the Echo

Source

If the system has both audio and video conferencing, troubleshoot the system without

the EF2201 at first. This will make sure the 4-wire AECs on both ends are working

properly. If one side hears echo, there is a problem with the AEC on the other side.

Troubleshoot the AEC according to the instructions for that device.

Make a call to test the EF2201’s telephone interface. If the party on the phone hears

echo, it is coming from the local or remote end. Disconnect one end at a time (by

briefly unplugging the speaker or microphone) and see when the echo goes away.

Troubleshoot the AEC on the side (local or remote) that was causing the echo.

If residual echo is heard on the local end, try disconnecting the remote end. If the

echo is still there, it is coming from the EF2201. Troubleshoot the EF2201 as

described in the next section. If the echo goes away when the remote end is discon-

nected, troubleshoot the AEC on the remote end.

If residual echo is heard on the remote end, disconnect the microphone(s) in the local

room. If the echo is still there, it is coming from the EF2201. Troubleshoot the

EF2201 as described below. If the echo goes away when the microphone is discon-

nected, the echo is coming from the local room. Troubleshoot the local AEC.

Removing the Echo If the EF2201 is not removing hybrid echo, it may be due to a mismatch of levels

coming into the EF2201. If levels are too far off, it may be difficult for the EF2201 to

determine when to adapt its filter. Make sure the levels are in the correct range by

watching the front panel LED meters during normal conversation. The signals should

regularly be hitting the first yellow light, and occasionally flicker the second yellow

light. Adjust the incoming signal levels if necessary. Also, make sure the Line Echo

Cancellation feature is enabled.

’

ECEIVE

ALLS

IAL

If you can’t receive calls or dial out, it could be because the telephone line is from a

digital PBX system, or the remote control system is not properly connected.

Test with an Analog

Phone

Try connecting a regular analog telephone to the EF2201’s line, and make a call. If

the telephone will not work on that line, it is probably a digital PBX line from an

office system. The EF2201 needs a standard analog line. You will need to get an

analog phone line installed for the EF2201.

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