Sounding a Buzzer or Horn Using Router's FXS Port -

[MarkTheGreat]

Greetings All,
We're looking for a relay that will pull in using the ring signal from an "FXS" port on a Cisco router.

Router: ISR4331 (with "FXS nim" card).

Buzzer or horn: 120Vac.

Port has been configured (FXS) to ring but I'm not able to measure ring voltage as in conventional system.

So is this a loop?
And if so, what kit is available to use that loop that includes a DPDT relay for 120Vac?

Thanks to any who reply, and a BIG thanks to any who reply with a part number!!

-MG

[Roger Kallberg]

I would recommend you to reach out to discuss this with an electrician as he/she would likely know what would be doable and usable. Cisco doesn't have any specific items orderable in their catalog for this.

[MarkTheGreat]

Thanks for the reply Roger.

I am working with our electrician.

Due to the increase in VoIP technology replacing old phone systems, we were both betting that Cisco did not offer
such a relay board, but are both certain a third party somewhere makes a device that will work, we just need to find it.

There are too many old systems with horns or buzzers outside the building that ring off the main number
to assume no one makes something to work with the new VoIP systems.

We have an old phone working off the FXS port, but simply need that port to sound a 120Vac buzzer on the outside of the building to alert personnel that there is a phone call coming in when they are out in the yard.

Thanks again,
MG

[MarkTheGreat]

Roger - FYI -

Per Cisco documentation:

"Ringing Voltages

The industry standard for PBX and Key Systems requires that the ring detection circuit be able to detect a ringing signal as low as 40Vrms. This voltage takes into account the effects of load and cabling voltage drop on a ringing signal generated from a Central Office (CO). Conversely, the CO (exchange) must supply ringing with enough power to drive the maximum load over the maximum cable length. In order to meet this requirement, a CO-based unit must present a ringing signal with an amplitude of approximately 85 to 100Vrms. Cisco voice gateways are intended for use as On Premise Services (ONS) equipment that is co-located or fairly close to equipment that detects ringing. Therefore, it can use a lower ringing voltage and still meet the 40Vrms 5 Ringer Equivalence Number (REN) requirement."

But - that is with older systems.

We used the 80-100Vrms "ring voltage" to pull in an isolation relay to sound a buzzer.

That is not supplied by the FXS port, so we need an "interpreting" device/card that can take the FXS ring tone/signal and convert it to a relay output.

Make sense?

Thanks again,
MG

[Roger Kallberg]

Not being an electrician I can't really comment on that.

[Jaime Valencia]

As Roger said, this is not something that Cisco sells, but you can just google and find many 3rd party vendors that have devices that integrate with voip systems directly over SIP, or other interfaces like FXS/FXO, look at viking or algo for that kind of devices.

Singlewire's informacast connects to many 3rd party devices for mass notification, you may be able to find some other vendors at their site.

[MarkTheGreat]

Thank you Jamie,
We had found Viking and are currently awaiting a reply.

Thanks,
MG