4b3t prevalence

4b3t prevalence

Post by Steve Meeha » Thu, 16 May 1996 04:00:00



I am interested in finding out the extent to which 4b3t line code is
still in use.  It is my understanding that 4b3t was used extensively
during the initial ISDN rollout in Germany, but that it is now being
replaced by 2b1q lines.

My questions are:

- which countries still use 4b3t?

- are u-interface echo cancellation chips for 4b3t still available?

- approximately how many 4b3t lines are in existence in Europe? Are
they being actively replaced with 2b1q?  If so at what rate?

- are there any companies (Seimens?) that still support 4b3t
development tools?

Thanks in advance for any input.  My company makes a  protocol analyzer
that works on 2b1q lines, and we are considering adding 4b3t
capability.  Obviously, we are trying to determine to what extent such
a product would be useful in Europe.

--
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Steve Meehan

Applied Signal Technology

 
 
 

4b3t prevalence

Post by Steve Meeha » Thu, 16 May 1996 04:00:00


I am interested in finding out the extent to which 4b3t line code is
still in use.  It is my understanding that 4b3t was used extensively
during the initial ISDN rollout in Germany, but that it is now being
replaced by 2b1q lines.

My questions are:

- which countries still use 4b3t?

- are u-interface echo cancellation chips for 4b3t still available?

- approximately how many 4b3t lines are in existence in Europe? Are
they being actively replaced with 2b1q?  If so at what rate?

- are there any companies (Seimens?) that still support 4b3t
development tools?

Thanks in advance for any input.  My company makes a  protocol analyzer
that works on 2b1q lines, and we are considering adding 4b3t
capability.  Obviously, we are trying to determine to what extent such
a product would be useful in Europe.

--
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Steve Meehan

Applied Signal Technology

 
 
 

1. Prevalence of 10xxx Dialing


| >104-441-700-TALK-121
| Looks like a new way to avoid 900 blocking to me.

'course, this works only in those areas that have 10XXX (Feature Group D?)
dialing.

Is that everywhere *except* the backwaters of GTE Northwest, now?  Or
are there still many places that don't have 10XXX dialing?

We can do 950-xxxx and "select our default 1+ carrier", but 10XXX is
only for the local Bell-co (US West, or whatever they changed their
name to this week) customers.

Just another telephone "operator",

/=Randal L. Schwartz, Stonehenge Consulting Services (503)777-0095 ==========\
| on contract to Intel's iWarp project, Beaverton, Oregon, USA, Sol III      |

\=Cute Quote: "Welcome to Portland, Oregon, home of the California Raisins!"=/

2. Oh! where? Oh where? "It is now safe to switch off " message gone?

3. DMI table address question

4. GTE & MFJ (was Re: Prevalence of 10xxx Dialing)

5. WINS - migration from NT4

6. Prevalence of 10XXX Dialing

7. SQL Query

8. 2B1Q 4B3T B6ZS implementation?

9. 4B3T in the USA?

10. Information About 4B3T (and 2B1Q)

11. 4B3T

12. 4B3T & 2B1Q