T1 Types?

Answered Question
May 2nd, 2007
User Badges:

I am trying to learn as much about T1s as possible. From what I have learned so far, I believe there are two types, a "regular" T1, and then a PRI, or Channelized T1. Is this correct?

Correct Answer by mohammedmahmoud about 10 years 1 month ago


Hi,


We can say that generally there are 3 T1 types


unchannelized

channelized

PRI


In unchannelized operation, a T1 encapsulates the entire T1 payload (1536000 bits/second) .In channelized operation, a T1 port may be configured with up to N separate data streams (N = 24 for a T1 port). Each data stream may include any combination of time slots, either contiguous or not. Of course, each time slot may be included in only one data stream.


An ISDN PRI T1 implementation has 23 B channels and a D channel. As with BRI, each of the B channels has 64- kbps bandwidth available. The D channel, however, is also a 64-kbps channel (unlike BRI).



HTH, please do rate if it does help,

Mohammed Mahmoud.

  • 1
  • 2
  • 3
  • 4
  • 5
Overall Rating: 5 (2 ratings)
Loading.
Correct Answer
mohammedmahmoud Wed, 05/02/2007 - 10:56
User Badges:
  • Green, 3000 points or more


Hi,


We can say that generally there are 3 T1 types


unchannelized

channelized

PRI


In unchannelized operation, a T1 encapsulates the entire T1 payload (1536000 bits/second) .In channelized operation, a T1 port may be configured with up to N separate data streams (N = 24 for a T1 port). Each data stream may include any combination of time slots, either contiguous or not. Of course, each time slot may be included in only one data stream.


An ISDN PRI T1 implementation has 23 B channels and a D channel. As with BRI, each of the B channels has 64- kbps bandwidth available. The D channel, however, is also a 64-kbps channel (unlike BRI).



HTH, please do rate if it does help,

Mohammed Mahmoud.

ron.carney Wed, 05/02/2007 - 10:59
User Badges:

That explains a lot, Mohammed, thank you so much. So, in a NON-ISDN, channelized T1, all 24 slots are the same, there is no B/D channels except in ISDN PRI? Is that correct?

mohammedmahmoud Wed, 05/02/2007 - 11:04
User Badges:
  • Green, 3000 points or more

Hi,


Sorry for the duplicated replies.


Yes you've got it right, in non ISDN the 24 slots are the same you can group them all in a non-channelized behavior, or you can group some of them together in a channelized behavior.



HTH, please rate if it does help,

Mohammed Mahmoud.

mohammedmahmoud Wed, 05/02/2007 - 11:01
User Badges:
  • Green, 3000 points or more


Hi,


We can say that generally there are 3 T1 types


unchannelized

channelized

PRI


In unchannelized operation, a T1 encapsulates the entire T1 payload (1536000 bits/second) .In channelized operation, a T1 port may be configured with up to N separate data streams (N = 24 for a T1 port). Each data stream may include any combination of time slots, either contiguous or not. Of course, each time slot may be included in only one data stream.


An ISDN PRI T1 implementation has 23 B channels and a D channel. As with BRI, each of the B channels has 64- kbps bandwidth available. The D channel, however, is also a 64-kbps channel (unlike BRI).



HTH, please do rate if it does help,

Mohammed Mahmoud.

mohammedmahmoud Wed, 05/02/2007 - 11:08
User Badges:
  • Green, 3000 points or more

Hi,


Sorry for the duplicated replies.


Yes you've got it right, in non ISDN the 24 slots are the same you can group them all in a non-channelized behavior, or you can group some of them together in a channelized behavior.



HTH, please rate if it does help,

Mohammed Mahmoud.

Actions

This Discussion