E1 Modes Of Operation; Alcatel-Lucent Specific Overview - Alcatel-Lucent OmniAccess 700 Cli Configuration Manual

E1 M O
ODES OF PERATION
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.
A -L S
LCATEL UCENT PECIFIC
•
In E1 lines, cable-length is referred to as Line Termination. There is no variation of
Long and Short cable length.
•
OA-700 supports fractional T1 or E1.
•
OA-700 supports Unframed E1.
•
OA-700 supports channelized T1 or E1.
CLI Configuration Guide
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Alcatel-Lucent
E1 Interface Overview
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