[cisco-voip] Maximum POTS lines on a 2921 router

[Doug McIntyre]

Might be easier to setup a channel-bank with a bunch of FXO ports to
terminate the analog lines into a T1 and feed the T1 back to the 2921 for
the gateway function. Something like an ADIT 600 or the appropriate Adtran TSU,
and the stock VWIC T1 card on the 2921 rather than mess with all those cards.

And at the prices the LEC's charge around here for 1FBs vs. PRIs,
switching to a PRI directly would probably pay the NRC and CPE charges
in less than 6 months when you are talking 23 1FBs.



On Wed, Dec 30, 2009 at 05:35:23PM +0500, Syed Khalid Ali wrote:
> For 23 Analog Line:
> 1)-  24 DSP channels
> 2)-  Does 2921 support analog voice termination to this capacity? 2921 has
> 4xEHWIC slots and looking at the datasheet it seem to be compatible with
> previous generation card. So there can be a total of 16 FXOs ( 4 x
> VIC2-4FXO) + EM-HDA-6FXO, so total of: 16 + 6 = 22 ports.
> 
> refer these for further details:
> ISR G2 modules support:
> http://www.cisco.com/en/US/prod/collateral/routers/ps10538/aag_c07_563807.pdf
> 2921 Datasheet:
> http://www.cisco.com/en/US/prod/collateral/routers/ps10537/data_sheet_c78_553896.html
> 
> -- 
> Thanks,
> Syed Khalid Ali
> 
> 
> On Wed, Dec 30, 2009 at 3:15 AM, Mike King <me at mpking.com> wrote:
> 
> > So this just got tossed in my lap, and I'm still digging for information.
> >
> > We have a site that basically had they're legacy phone system die (It's not
> > totally dead, but it ain't happy).  The plan is to do an SRST with a new
> > 2921 router and add them to our main site.
> >
> > The problem is coming down to the interface to the PSTN.  We
> > were originally told that the site has a T1.  Further investigation
> > has revealed the site infact has analog lines, it's unknown if they are
> > Groundstart/loopstart/POTS, etc.
> >
> > Question:
> >
> > Is it possible to get 23 analog lines into a single 2921 router?  If so,
> > what combination of cards/*WICS would make this happen.
> > We're looking to get the site converted to a T1, but we're not sure what
> > the time line on that happening is.
> >
> > Mike
> >
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> >

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