[asterisk-users] Maximum cable length for analog phone from FXS port

[Wilton Helm]

You are exactly right.  Cat 5 had no advantage over cheaper wire for voice,
and the length limitations are meaningless.  Consider that Cat 5 is
typically use with signals that extent to 30 MHz or beyond.  A voice grade
analog circuit must go to 4 KHz (1/10,000 as much).  At 4 KHz, the wire
generally doesn't even act like a controlled impedance.

 

Wilton

 

From: asterisk-users-bounces at lists.digium.com
[mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of David Gibbons
Sent: Tuesday, May 26, 2009 8:50 AM
To: Asterisk Users Mailing List - Non-Commercial Discussion
Subject: Re: [asterisk-users] Maximum cable length for analog phone from FXS
port

 

I could be wrong but I don't think the cat5 limit of 100 meters applies to
any analog signaling over that copper. I believe it only applies to Ethernet
signaling.

 

-Dave

 

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