FXS

[DaveA66]

Hi

I may need to install a 3CX with about 50 POTs (don't ask!)

Has anyone used a 24 port FXS module successfully?
I don't really want to fix about 12 4 port ones to the wall!

I was looking at

Patton SmartNode SN4424/JS/UI 24 FXS​

Thanks!

Dave

 

[Evolute IT]

FXS is for analog phones.

You need FXO for POTS.

 

[DaveA66]

I meant POT as in analogue handset? Always thought that was FXS.

 

[Evolute IT]

I meant POT as in analogue handset? Always thought that was FXS.

Then it's not POTS.

POTS is analog phone lines.

FXS is analog phones/handsets.

You just mixed them lol POTS isn't phones.

But yeah, if you need a lot of FXS, go with a Patton supported model or Grandstream (16, 24, 32, 48-ports).

 

[ARPtable]

Technically both FXS and FXO are POTS. An easy way to think about it is FXS is hot or "Shocking", it has voltage. FXO is not hot, or "Off". I learned it that way decades ago and it always stuck with me. It can otherwise get confusing when you have gateways/adapters that have both FXS and FXO ports. I think this document explains it perfectly:

https://www.3cx.com/pbx/fxs-fxo/

Not that I think it would be safe to stick your tongue on an FXO port (or any port) to see if it shocks you. LOL

 

[CentrexJ]

I meant POT as in analogue handset? Always thought that was FXS.

Is this for a hotel? If so, go with the Grandstream FXS device not the Patton as it supports both methods of MWI light method. Last time I looked into this the Patton only supports MWI if the phone is powered with a cable but the Grandstream can send an unpowered phone the MWI indicator.

 

[leejor]

Technically both FXS and FXO are POTS.

Well...technically, POTS refers to a service, as in Plain Old Telephone Service, that you would subscribe to, from your local PSTN provider, it really has nothing to do with the instruments/devices themselves.

The terms FXO and FXS came about from the time when telephone companies offered Foreign Exchange (FX) services. Long before number porting, if someone wanted to pay for a telephone number from a different exchange, outside their normal service area, it had to be run from one central office to another, then to the subscriber. The equipment at the originating office was referred to as FXO (with O for Office, or Originating) and at the Subscriber (or Set) end... FXS. In the last 60 years or so, this equipment was usually made up of channel bank cards, but there were many ways of doing this depending on the method of transport. They can still used for things like analogue DID lines (yes, some people still use them), with the FXO at the customer end, and the FXS going to a trunk circuit card, or special line card, on the central office switch.
The terms simply continued to be used as we transitioned to VoIP, as they were easy to understand.

 

[DaveA66]

I was referring to POT (no S, so no service)
In the UK us (old school) engineers have always used POT (plain old telephone) as a device.
Yes agrees POTS is a service, a POT is not

 

[AlexDBarrett]

Have used one of these in a Hotel environment to make use of existing, low cost telephones located in rooms.
Unsupported by 3CX however does work well and is good value for money.
https://www.sangoma.com/voip-gateways/analog/vega3050g/

 

[DaveA66]

Thanks for the tip!