[cisco-voip] Loopstart vs Groundstart

[Mike Thompson]

Loopstart = easier install (90+% of installs if I had to guess), no  
earth ground required, low likelihood of of audio hum

Groundstart = MUCH less common, earth ground required and not always  
readily available, almost no hum.

Sent from my phone, apologies for any typos.

On Mar 3, 2010, at 4:41 PM, Mike King <me at mpking.com> wrote:

> I'm just confirming what used to apply to my old PBX still holds  
> true with a VIC2-4FXO in a 2921 router.
>
> For analog lines from the PSTN:
>   Loopstart bad
>   Groundstart good
>
> The application is I'm bringing up a small SRST site, and we are  
> replacing they're old key phone system.  I have no idea what the  
> existing lines are, but we have enough time to change the type out.
>
>
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