refer to the BSCN by cisco press by paquet teare for confirmation.............;
""John Botha"" a icrit dans le message de news: [EMAIL PROTECTED] > My opinion of in-band and out-of-band: > > In-band is when channel control signals are mixed with normal data i.e. > dialup. > Out-of-band is when a separate channel is used for link control information, > i.e. ISDN D-channel. > > Regards, > > John Botha > CS IT Solutions > Tel: +27 (0) 11 205-7000 ext 6851 > Fax: +27 (0) 11 807-8992 > Cell: 082 334 8267 > E-mail:[EMAIL PROTECTED] > > Adding Value to IT > > -----Original Message----- > From: Karen E Young [mailto:[EMAIL PROTECTED] > Sent: 12 March 2003 07:49 > To: [EMAIL PROTECTED] > Subject: Re: PRI [7:64999] > > My take on it is... its out-of-band. It's just multiple logical channels > multiplexed onto a single physical channel. It doesn't matter that the > logical channels work together, the time slots remain dedicated to their > respective channels and the traffic doesn't mix. > > Just my .02 > Karen > > *********** REPLY SEPARATOR *********** > > On 3/11/2003 at 11:37 PM Priscilla Oppenheimer wrote: > > >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] Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=65154&t=64999 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
