I think even a "pure data" T1 is channelized. Even the PRI is as well.
-- RFC 1149 Compliant. ""Wesley"" wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > I think the main thing to note about cT1s is bit robbed signalling i.e > channel asscociated signalling normally used to transport voice. Therefore, > we've got 7 bits of payload, 1 bit for signalling for every timeslot and 1 > bit for framing. Bit robbed signalling would effectively yield a 56 kbps > pipe as opposed to 64 kbps offered by ISDN PRI. However, 64 kbps (1 > timeslot) of the 24 timeslots is used for signalling. This is also known as > common channel signalling. As I understand it, there are three major types > of services riding on T1 links: > > 1. Pure data T1 i.e. unchannelized T1 > 2. Channelized T1 and > 3. ISDN PRI > > Wes > > > ""Steven A. Ridder"" wrote in message > [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > > I think a channelized T1 sends 193 bit frames as well. 8 for each channel > > plus 1 for timing = 193. > > > > All T1's are channelized, otherwise it would have to be some sort of > > byte-synch communication, which isn't plausible. > > > > I think the tech you spoke to is incorrect as well. > > > > > > ""John Neiberger"" wrote in message > > [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > > > Just when I thought I understood the T1 world pretty well we've run into > > > a situation that is thoroughly confusing me. > > > > > > I was under the impression that channelized T1 services used 24 > > > timeslots. I call that 'channelized' because it has 24 distinct > > > 'channels'. It's my understanding that unchannelized T1 doesn't use the > > > 24 timeslots and instead sends one giant 192-bit frame. > > > > > > At one of our locations we are muxing voice and data traffic onto a > > > single T1. At each end we split off certain channels to a router and > > > other channels over to the PBX. To do this, wouldn't the T1 *have* to > > > be channelized, since we're separating the channels at the CSU/DSU? > > > According to our provider, that circuit is unchannelized. If a circuit > > > is truly unchannelized, how would the CSU/DSU be able to accurately > > > split the T1 into two separate streams based on channel information? > > > > > > To be more clear, let's say we have the CSU/DSU configured to split > > > channels 1-12 to the router and 13-24 to the PBX. This splitting > > > function is based on the assumption that channels exist on the incoming > > > T1. If they don't exist and we have one giant frame instead of 24 > > > smaller frames, how could this possibly be working?? > > > > > > Yowza...my head hurts. > > > > > > John Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=47927&t=47844 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
