the D channel in on the 16th not the 15th for an E1.... ""Priscilla Oppenheimer"" a icrit dans le message de news: [EMAIL PROTECTED] > So, here's a question for you all. I saw this on a practice test. Does ISDN > use "in-band" or "out-of-band" signaling and is it different for BRI versus > PRI? > > Well, it's not robbed-bit signaling, from what I understand, which I guess > means it is "out-of-band"? The signaling has its own channel. But the > signaling channel is bundled with the other channels in the circuit that > your order from the telco. > > BRI has the 2 Bearer channels and the one D channel that enter the CPE > together on a 2-wire circuit. > > With PRI, in Europe, ISDN enters the CPE on an E1 (4-wire ?) circuit. The > 15th timeslot is used for signaling. > > With PRI, in the U.S., ISDN enters the CPE on a T1 4-wire circuit. The 24th > timeslot is used for signaling, if you can believe the books. > > What would be "the Cisco answer" to the question of ISDN signaling being > in-band versus out-of-band? > > Thanks, > > Priscilla > > Jens Neelsen wrote: > > > > Hi, > > > > Yes, it is one D channel per PRI. An E1 has 32 timeslots of > > 64kbps (=30B +1D +1timing). A T1 PRI has 24 timeslots + rest > > (=23D +1D). Timing is in the rest. > > > > You can save D channels if put more than one E1/T1 in a bundle. > > Then you need only one D channel per bundle. > > > > So the answer is: not more than one D channel per PRI. > > > > Jens > > > > --- maine dude wrote: > > > Hi All, > > > > > > Quick question I hope you can help me with. > > > > > > How many D channels does a PRI have? > > > > > > I always thought it was two, but its states 1 in most places. > > > > > > Text taken from the CCNP remote access guide (to make it more > > > confusing): > > > > > > there are 30 timeslots, leaving 2 timeslots for signalling and > > > framing. > > > Timeslot 0 is used for framing and timeslot 16 is used for > > > signalling > > > (counting 0-31). E1 PRI makes use of this same principle. > > > Timeslot 16 is the > > > D channel and timeslot 0 is used for framing information. > > > Please advise. > > > Regards,DJ > > > > > > > > > > > > --------------------------------- > > > With Yahoo! Mail you can get a bigger mailbox -- choose a size > > > that fits > > > your needs > > [EMAIL PROTECTED]
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