• Subject: RE: Leased Line AS/400 access
  • From: "John Taylor" <john.taylor@xxxxxxxxxxxxxxx>
  • Date: Thu, 30 Sep 1999 21:04:19 -0600
  • Importance: Normal

Hi Bill,

I haven't seen any good websites on this either. However, I did a quick
search, and found the following definitions in an online dictionary at
http://www.lightwave.com/glossary.html:

"DS-0, DS-1, DS-3 - Standard telecommunications industry digital signal
formats, which are distinguishable by bit rate (the number of binary digits
(0 and 1) transmitted per second). DS-0 service has a bit rate of 64 Kbps
and can transmit one voice conversation. DS-1 service has a bit rate of
1.544 Mbps and can transmit 24 simultaneous voice conversations. DS-3
service has a bit rate of 45 megabits per second and can transmit 672
simultaneous voice conversations."

"T-CARRIER OR T-1 OR T-3 - Insulated copper wire cables which carry
electrically transmitted digital signals. A T-1 cable carries a DS-1 signal
(1.544 Mbps), and a T-3 cable carries a DS-3 signal (45 Mbps). Also, a
generic name for any of several digitally multiplexed carrier systems
originally designed to carry digitalized voice signals"


John Taylor


> -----Original Message-----
> From: owner-midrange-l@midrange.com
> [mailto:owner-midrange-l@midrange.com]On Behalf Of Bill Paris
> Sent: Thursday, September 30, 1999 6:36 PM
> To: MIDRANGE-L@midrange.com
> Subject: Re: Leased Line AS/400 access
>
>
> John,
>
>     I've heard the term "DS-x" mentioned where "x" was multiplied with
> channels to get total bandwidth but I have yet to find a publication or
> website that explains this.
>
>     DS vs. T: I agree. A Bell Atlantic tech told me recently that "DS"
> refers to fiber whereas "T" refers to copper. They don't bother running
> copper anymore, it's too heavy & expensive. Matter of fact, we
> recently had
> a demark installed in our corporate offices for our frame and they ran
> fiber. Out of 48 (maybe 64) tubes of glass in the cable they
> ended up using
> 2! I asked why run 48 lines when we needed only 2 and they said that's all
> they run now. The rest will be used either by us for expansion or other
> firms on our street/ in our neighborhood.
>
> Bill Paris
> Sorrento Cheese Co., Inc.
> 716-823-6262 x376
> bparis@sccmail.com
>
>
> >From my limited understanding,  a T1 can be used to deliver ISDN PRI
> >services, or Frame Relay services, or one of several other protocols.
> >
> >Technically speaking, in digital networking, a single 64-Kbps channel is
> >referred to as a DS-0. Beyond that is the DS-1, a collection of 24 DS-0
> >channels. A DS-1 delivered over a copper wire is called a T1. This term
> "T1"
> >has become so popular that people often use it to refer to any 1.5 Mbps
> >link.
> >
> >I think it is also largely a matter of telco packaging. Our 256K ISDN
> >connection could just as easily have been purchased as a
> fractional T1. The
> >difference is the in the cost. ISDN was packaged at a lower cost than
> >fractional T1, even though they both employ the same copper.
> >
> >John Taylor
>
>
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