From: Scott Morris (swm@emanon.com)
Date: Fri Jun 13 2003 - 22:19:48 GMT-3
A "pure" Cisco solution wouldn't have the PBX at all. :) It would use
FXO cards(for analog DS0) or MFT cards/53xx/6608(for DS1) to connect to
the PSTN directly. And use the FXS cards, VG248 or 6624 to set up
analog station phones.
But otherwise, for lab and playing around, there are multiple ways to
connect things together. The relationship between FXO and FXS is the
same, and you're correct, as long as they share the basic signaling type
(typically ground) then life is good!
Scott
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Anthony Pace
Sent: Friday, June 13, 2003 6:18 PM
To: swm@emanon.com; ccielab@groupstudy.com
Subject: RE: VoIP: FSX, FXO, E&M
Thank you Scott,
It sounds like a pure Cisco solution would put phones or a PBX onto the
FXS ports and put the the POTS lines to the PSTN into an FXO card to be
the default for any calls needing to go out. IT sounds like an FXS card
can sully dial tone to a PBX as long as they both expect to use the same
kind of signalling( graound start or loop start)
Tony
On Sun, 8 Jun 2003 20:10:43 -0400, "Scott Morris" <swm@emanon.com> said:
> An FXO port relies on some other device to supply dial tone and works
> like a normal telephone does. This can be an analog line (not trunk)
> from the CO, or an FXS (analog station) port on a PBX.
>
> The FXS port will supply dialtone, assuming the other device is kinda
> dumb. Connect a telephone to it, or likewise you can connect a phone
> system/PBX to the other end with a universal trunk card (or something
> expecting a generic, all-purpose analog line from the CO)
>
> The E&M port is designed to connected phone systems together and will
> allow some extra signalling options for extended features.
>
> So you have multiple ways of connecting things together, but what
> features you will have where depends on how they're connected.
>
> Scott
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
> Of Anthony Pace
> Sent: Sunday, June 08, 2003 6:39 PM
> To: ccielab@groupstudy.com
> Subject: VoIP: FSX, FXO, E&M
>
>
> Is my understanding of the VoiP cards correct:
>
> FXS: Connect to an analog phone or a PBX in the same site
>
> FXO: Connect to the PSTN via an analog trunk. The CO switch sends
> analog calls accross this loop into the router-FXO which VoIPs them
> accross the IP WAN or LAN.
>
> E&M: COnncet to a PBX accross an analog trunk, perhaps to a site
> without VoIP.
>
> I have also heard that some PBX's use FXS to connect to the router. Is
> there a good reference for this, or is it dependent on the PBX?
>
> Tony Pace CCIE #10349
> --
> Anthony Pace
> anthonypace@fastmail.fm
>
> --
> http://www.fastmail.fm - Send your email first class
>
>
-- Anthony Pace anthonypace@fastmail.fm-- http://www.fastmail.fm - Faster than the air-speed velocity of an unladen european swallow
This archive was generated by hypermail 2.1.4 : Fri Jul 04 2003 - 11:10:58 GMT-3