From: Scott Morris (swm@emanon.com)
Date: Thu Oct 16 2003 - 23:56:45 GMT-3
Well... It depends on who you want to supply the dialtone. So you MAY
connect the other way around. The FXS port on the voice port gateway to
an analog trunk port on the phone switch....
Depends on your design and what you are attempting to accomplish!
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: ccie2be [mailto:ccie2be@nyc.rr.com]
Sent: Thursday, October 16, 2003 3:56 PM
To: swm@emanon.com; 'Group Study'
Subject: Re: Voice Ports
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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