01-15-2002 10:23 PM - edited 03-01-2019 08:04 PM
01-16-2002 08:27 AM
In general terms, the former is a standard channelized trunk for voice/DS0 traffic, while the latter would be an E1 provisioned for ISDN (30 b channels, one D channel, and one synchronization channel).
01-23-2002 06:07 AM
E1 = 2048Kbps transmission channel/trunk
Fractionalised E1= 31 timeslots X 64Kbps for Data Tx
30B+D (for PBX) refers to PRI or primary rate ISDN (intergrated services digital network)= 31 X 64Kbps where 1 X 64 Kbps = D channel,used for signalling and 30 X 64 Kbps B channels used usually for voice but can include data and video too.
Discover and save your favorite ideas. Come back to expert answers, step-by-step guides, recent topics, and more.
New here? Get started with these tips. How to use Community New member guide