Connecting RCA Audio to PBX Analog Port 1

[ElBoboLibre]

Hello,

I need to provide on-hold music to our PBX via analog phone input.

Specifically, I need to connect an unbalanced consumer-level audio output (mono RCA) to an analog phone port on our Avaya PBX (TN793CP 24-port analog line card.)

Something like connecting the tip/shield of the RCA to the tip/ring of the analog input.

I've read that you can't just hook them together without using a transformer for isolation.

Is this true, and if so, is there a way to construct something in-line that is relatively inexpensive?

In total, I need to connect 24 RCA's to 24 analog phone ports via 110 punchdown block. So, it seems I need to put 24 isolation transformers between each RCA and punch-down pair.

Is this something that is easy to build?

Any pointers from you pro's would be most appreciated.

Thanks,
Bob

 

[SYQUEST]

I believe Avaya makes such an adapter for that purpose. You might try the Avaya documents for your PBX. I think from the module you mention, it is a Definity PBX. Those documents are downloadable for free from: support.avaya.com. That adapter should be available from many dealers and resellers out there. Google should provide lots of links. You might check out the Definity forum also for better results.

....JIM....

 

[donb01]

Valcom makes such a beast for less than $30 on average. There is another brand that I've used often too and I can't remember the name of it now that I need to....

http://www.valcom.com/pdf/vmt-1.pdf