[Asterisk-Users] How many FXS/FXO ports do I need?

Kerry Garrison kerryg at techdatapros.com
Fri Apr 8 18:32:29 MST 2005


For your configuration you should get two X100P cards (compatible cards are
$6.95 on eBay). That's all you would need. The 5 phones connect to the
Asterisk server over an ethernet connection.

Kerry Garrison
http://www.geekgazette.com
 

-----Original Message-----
From: asterisk-users-bounces at lists.digium.com
[mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Aaron O'Hara
Sent: Friday, April 08, 2005 5:31 PM
To: Asterisk Mailing List
Subject: [Asterisk-Users] How many FXS/FXO ports do I need?

All,

I'm new to phone systems and phone wiring and I couldn't find an answer to
this question on the wiki or google.

My understanding is that a standard residential/business phone line carries
the signal over 2 wires.  Your 4-wire RJ11 wiring supports 2 phone lines.
Given that each line takes 2 wires, and there are 8 wires in an FXO port,
can I conceivably support 4 phone lines on one FXO port?

On the phone/FXS side of things, can you also have multiple lines per FXS
port?

If I want to hookup 5 phones to my residential phone service with 2 lines,
what # of FXO & FXS ports do I need?

Thanks for your clarification...

-- Aaron


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