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

[Jon Pounder]

Wilton Helm wrote:
>
> 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.
>

I completely agree, but that said I still use cat5/e for everything 
anyway, not worth having more than one kind of wire, and lets you change 
your mind later on the usage. Once you are using outside plant 
facilities though, you live with what you get, and don't expect much.

> 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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