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Excalibur HA-1 interface to Grandstream GXP-2000 VOIP Deskset

M

mattthepm

Guest
Our station is in the process of going from POTS to VOIP. We purchased three Grandstream GXP-2000 VOIP desksets, two of which are in our main studio and production room.

I am having an issue with the Excalibur HA-1 interface, which taps into the handset audio of any telephone and interfaces to a telephone hybrid (it makes the handset audio look like a CO line). A button on the front of the unit switches between the handset and hybrid.

We purchased two of these units, one for the main studio and one for the production studio.

After trying with both the Grandstream desksets and a POTS phone with an analog line, I am unable to get any decent audio from our hybrids, both of which are Gentner Peoplelinks.

With our old setup using a POTS line plugged into the LINE jack on the back and a POTS handset plugged into the SET jack, the Peoplelinks work wonderfully.

However, with the Excalibur units, I have to crank up the output of the Peoplelink to hear anything, and it's buried in noise and hash to boot.

Is it a wiring issue between the Excaliburs and the Peoplelinks, or do I have two bad Excalibur units?

Best,

Matt
98.9 FM, WRFN-LP, Radio Free Nashville
Pasquo, TN
 
I don't know that much about the Peoplelink. Some hybrids require line power (talk battery) to operate, depending on the type of circuitry they use. I'm not sure if that Excalibur box provides battery on the side that the hybrid connects to. There may be a jumper in the hybrid that you need to change to tell it that the line is "dry" meaning no talk battery...some hybrids have this feature because certain office PBX phone systems don't have battery on the audio pair.

I don't know how your station is programmed...I volunteer for an LPFM station and we do a large amount of high school sports. If you did a lot of sports or remotes on your POTS line, you may find that your sound quality is worse on VoIP depending on the type of codec that the VoIP system is using. A lot of those systems use codecs that are designed for voice but can't handle background noise (or in our case, crowd noise in a noisy gym) very well and the result is that you sound tinny and garbled. This same sort of problem exists with remotes over cell phones.
 
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