Cisco Support Community
Showing results for 
Search instead for 
Did you mean: 
Community Member

How are ISDN PRI, Channelised E1 and Non-channelised E1 different

Hi All

I would like to know if ISDN PRI and Channelised E1 are different from each other? If yes, how and when is ISDN PRI is used and when is Channelised E1 is used?

Also what is Non-channelised E1 and when it is used?

Thanks and regards

Vijayendran Sridharan


Re: How are ISDN PRI, Channelised E1 and Non-channelised E1 diff

Here are a few URLs that should answer your questions.

"The key difference between traditional channelized lines (analog) and non-channelized lines (digital or ISDN) it that channelized lines do not have built-in D-channel signaling. All 24 channels on a T1 line for example only carries data. The signaling is in-band or associated to the data channels (also known as robbed bit signaling for T1 lines or channel associated signaling for E1 lines). A traditional channelized line cannot support a digitized data call (for example, BRI with 2B+D). The only supported signals on a traditional channelized line are onhook, offhook, relay open, and relay closed. The Cisco AS5200, Cisco AS5300, and Cisco 3600 series support different types of channel associated signalling for receiving and transmitting analog calls, such as ground start, loop start, wink start, immediate start, and E&M. Signaling for CT1 or CE1 is turned on or enabled with the cas-group command, which is configured on a T1 or E1 controller." Taken from

CreatePlease to create content