E1 Interface Overview
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Alcatel-Lucent
Beta Beta
OmniAccess 5740 Unified Services Gateway CLI Configuration Guide
E1 MODES OF OPERATION
The E1 interface supports 3 different kinds of bit structures: Frame, Multiframe,
and Unframed. The mode of operation dictates how the bits are structured and
consequently the way it will be interpreted. The E1 modes are listed below:
• Unframed (UNF): A stream of bits at 2.048 Mbps. No channels are associated to
any specific group of bits. In an unframed operational mode, none of the
mechanisms described above is used.
• Framed (FR): 31 time-slots are used to transfer data. Detection of the frame
boundaries (synchronization) is achieved using TS0.
• Multiframe (MF): TS0 is used for the synchronization of the Multiframes. All other
channels are unaffected. Multiframe structure is used for two purposes: CAS
signaling and Cyclic Redundancy Check (CRC). Each of these modes are
independent from the use of the other.
• MF + CAS: Same as MF + One channel that is dedicated for signaling (CAS).
• MF + CRC: Using the Si bits of each FAS to deliver the CRC - 4.
• MF + CAS/CCS + CRC
• ESF + CAS
• ESF + FDL
• ESF + CAS/CRC/FDL.
• CCS: Can be used in each of the framed formats by dedicating one channel
(usually TS-16) for delivering the signaling messages in a predetermined protocol.
ALCATEL-LUCENT SPECIFIC OVERVIEW
• In E1 lines, cable-length is referred to as Line Termination. There is no variation of
Long and Short cable length.
• OmniAccess 5740 USG supports fractional T1 or E1.
• OmniAccess 5740 USG supports Unframed E1.
• OmniAccess 5740 USG supports channelized T1 or E1.
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