Mats Karlsson wrote: > Jeff Gehlbach wrote: > >>I can't comment on E1, but one slight correction on PRI channelization >>terminology: the "D" designation of the signalling channel stands for >>"delta", not "data". The same applies for the 16Kbps "D" channel used >>in BRI. > > And Jeff, the D channel is data and B is for bearer in the ISDN language. > > The D channel is used for signaling and data transfer like text messages > between ISDN devices. > > So the doc is correct on this point.
Mats, the D channel carries control messages and is frequently -- though incorrectly -- called the "data" channel. This confuses many newcomers to digital telephony, because the B channels are also capable of carrying data.
The correct name of the D channel is "delta," and the name for a B channel is "bearer." In addition to being symantically correct, we should avoid mis-naming the D channel as a "data" channel to prevent confusion.
Please feel free to verify; google for "isdn delta bearer". All the best, rm ------------------------------------------------------------------------- Roderick Montgomery [EMAIL PROTECTED] <URL:http://thecomplex.com/> the fool stands only to fall, but the wise trip on grace... [Sarah Masen] ------------------------------------------------------------------------- _______________________________________________ Asterisk-Doc mailing list [email protected] http://lists.digium.com/mailman/listinfo/asterisk-doc
