Hello Leonard!

May 06 18:33 03, Leonard Erickson wrote to Bo Simonsen:

 BS>> That's right. But i think of if they were used for normal telephone
 BS>> traffic, it sounds of a quite low speed. 

 LE> Not really. The aren't carrying any of the *voice* traffic. They are
 LE> simply a *control* channel. For "normal" phone system
use, the phone
 LE> switches on each end use the D channel to tell each other when
 LE> something changes. 

Yep, but the most of the calls won't be long, and there is alot of calls,
... but i can see the information it should be carrying isn't very big.

 LE> That's a few bytes to set up a call and a few bytes to break down a
 LE> call. And *nothing* during a call. 

Ok.

 BS>> I heard about it.. Was it cheeper than using the B channels, or was
 BS>> there any other advantages of it? 

 LE> It was another data channel. I recall an early ISDN presentation to a
 LE> local PC users group. They were going to have email sent via the D
 LE> channel, with a "message light" on the ISDN box to let
you know you 
 LE> had email waiting.

Oh that was smart.. Actually i saw a ISDN TA with the same aviability. But
it should be supported by the Telco.

Regards,
Bo

--- Msged/LNX 6.1.2