E1 bit Structure
There are several E1 modes, all use 2048 Kb/s:
- Unframed (UNF) - stream of 2048 Kb/s with no channel association
- Framed (FR) ? all 32 slots are used for data, detection of boundaries is gained with
TS0 - Multi-Framed (MF) ? TS0 is used for synchronization, all other channels are unaffected
- MF + Channel Associated Signaling (CAS)1
- MF + Cyclic Redundancy Check (CRC)
- MF + Common Channel Signaling (CCS)/CAS + CRC1
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