From: ccie2be (ccie2be@nyc.rr.com)
Date: Thu Oct 16 2003 - 16:55:39 GMT-3
Thanks for getting back to me on this. Will a key system (without E&M
ports) always connect to the router's FXO's ports or does it depend on other
factors? And, which factors?
Thanks so much, dt
----- Original Message -----
From: "Scott Morris" <swm@emanon.com>
To: "'ccie2be'" <ccie2be@nyc.rr.com>; "'Group Study'"
<ccielab@groupstudy.com>
Sent: Thursday, October 16, 2003 2:40 PM
Subject: RE: Voice Ports
> An easy way to look at it:
>
> FXS will supply dialtone to the device, FXO requires dialtone to be
> supplied by something else.
>
> If your phone system is able to use ANALOG equipment (e.g. fax machine),
> then it has an FXS port (supplying dialtone) which can connect to a
> router's FXO port (needing dialtone).
>
> HTH,
>
>
> Scott Morris, CCIE4 (R&S/ISP-Dial/Security/Service Provider) #4713,
> CISSP, JNCIS, et al.
> IPExpert CCIE Program Manager
> IPExpert Sr. Technical Instructor
> swm@emanon.com/smorris@ipexpert.net
> http://www.ipexpert.net
>
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> ccie2be
> Sent: Thursday, October 16, 2003 2:25 PM
> To: Group Study
> Subject: Voice Ports
>
>
> Hi,
>
> To connect a telephone key system that doesn't support E&M interfaces to
> a router which type of vic should be used, FXS or FXO?
>
> I understand that FXS ports are used to connect to analog phones and fax
> machines and that FXO ports are used to connect to the PSTN, by I'm not
> sure about small key systems.
>
> Also, in the lab, besides FXS vic's, are either FXO's or E&M vic's
> present?
>
> Thanks, dt
>
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