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Tuesday, November 28, 2017

How many channels are in a full T1 PRI trunk?

How many channels are in a full T1 PRI trunk?

  • 23
  • 6
  • 24
  • 32 

 

How many channels are in a full T1 PRI trunk?

 

EXPLANATION

T1 connections have 24 channels in total.

Typically, for T1 ISDN (CCS) protocols, 23 channels are used as B-channels and 1 channel is used as a D-channel. For this reason, the frame structure of a T1 PRI connection is said to be 23B+1D where the D-channel is located on timeslot 23 (channels numbered from 0 to 23) and the remaining channels are used as B-channels. Hence;
If you had an E1 PRI trunk, you would have 30 B channels and 2 D channels.

SOURCE

https://en.wikipedia.org/wiki/Primary_Rate_Interface
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