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svermill Wed, 01/16/2002 - 08:27
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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).

Anonymous (not verified) Wed, 01/23/2002 - 06:07
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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.

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