[ale] OT - DSL

Mike Panetta ahuitzot at mindspring.com
Fri Jul 12 15:18:35 EDT 2002


On Fri, 2002-07-12 at 06:58, Charles Marcus wrote:
> > From: James P. Kinney III [mailto:jkinney at localnetsolutions.com]
> > Sent: Friday, July 12, 2002 9:08 AM
> >
> > The other advantage is it is based on T1 technology. Which
> > means, no distance limitations, can be installed anywhere.
> > I have run into loads of small businesses that want high-
> > speed connections but are in the no-adsl zones.
> 
> True - this is an excellent alternative for small businesses.  They even
> have a program where you can aggregate multiple T-1's in the same manner.
> 
> > I don't know why they (CBeyond) are calling it voice-over-IP
> > since its really not (marketing droid found a cool buzzword).
> 
> Well, according to the Sales Reps Tech who was there in my meeting with
> them, it really is voice-over-IP - he specifically said (because I
> specifically asked) that all voice communications are packetized and sent
> over the T-1 to their equipment, where the voice and data allocation takes
> place.

In Jameses defense, just because its packetised does not mean its IP. 
Its only IP if there is an IP address and they use the IP protocol to do
the work.  There are many other packet protocols that are used over
telecommunications lines that are packet based, ATM (Asynchronus
Transfer Mode IIRC...) is the first that comes to mind.  It could just
be a dynamic ATM (cloud I guess is the term?) between you and the CO
switching equipment, where they allocate more or less of the bandwidth
to voice depending on demand.  ATM is a packet switched network so this
is a posibility I guess.  SS7 (Signaling System 7) is another
possibility I believe.  Its also a packet switched network IIRC.

Did the sales guy actually say that the voice data was sent over the
same IP network that your internet data was sent over?  If thats the
case then it probably takes up one of your assigned IP addresses.  That
may be a good way to verify.

> 
> > It's just a dynamically allocated T1. 12 9600 baud analogue
> > lines of solid, steady connectivity.
> 
> Hmmm. Either you are mistaken, or he must have been lying, or didn't really
> know and was making assumptions, because he talked 24 64k channels.

In your defense a T1 is definately NOT 12 9600 baud connections...

Depending on how its configured, if its a PRI (Primary Rate) ISDN for
instance, its configured as 24 64K channels. I think it can also be
configured as a single 1.544Mbps channel (1.544 Mbps is the raw bit rate
of a T1).  Its been awhile since I cared about all this telecom stuff so
I am a bit rusty...


Mike
> 
> Charles
> 
> 
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