1 Basic principle
1.1 Frame Alignment Signal (FAS)
1.2 Bit-rate Allocation Signal (BAS)
1.3 Encryption Control Signal (ECS)
1.4 Remaining capacity
2 Frame alignment
2.1 General
2.2 Multiframe structure
2.3 Loss and recovery of frame
alignment
2.4 Loss and recovery of multiframe
alignment
2.5 Procedure to recover octet timing
from frame alignment
2.5.1 General rule
2.5.2 Particular cases
2.5.3 Search for Frame Alignment Signal (FAS)
2.6 Description of the CRC4 procedure
2.6.1 Computation of the CRC4 bits
2.6.2 Consequent actions
2.7 Synchronization of multiple
connections
2.7.1 Multiple B‑connections
2.7.2 Multiple H0 connections
3 Bit-rate allocation signal
3.1 Encoding of the BAS
3.2 Values of the BAS
4 Bit-positions for audio, video and
data stream
4.1 LSD streams
4.2 Encoded audio streams
4.3 Encoded video streams
4.4 ISO-encoded audio streams
Annex A Definitions and tables of BAS values
A.1 Audio command values (000)
A.2 Transfer-rate command values (001)
A.3 Video, encryption, loop and other
commands (010)
A.4 LSD/MLP commands (011)
A.5 Audio capabilities (100)
A.6 Video, MBE and encryption
capabilities (101)
A.7 Transfer-rate capabilities (100)
A.8 LSD/MLP capabilities (101) and
other (110)
A.9 Escape table values (111)
A.10 HSD/H-MLP/MLP capabilities (Table
A.2)
A.11 HSD/H-MLP commands (Table A.2)
A.12 Au-ISO commands (Table A.2)
A.13 Au-ISO capabilities (Table A.2)
A.14 Applications within LSD/HSD
channels Capabilities (Table A.4)
A.15 Applications within
LSD/HSD/MLP/H-MLP channels Commands (Table A.4)
A.16 Transfer-rate capabilities and
commands used in Channel Aggregation (Table A.6)
Annex B Frame structure for interworking between a 64
kbit/s terminal and a 56 kbit/s
terminal
B.1 Sub-channel arrangement
B.2 Operation of the 64 kbit/s
terminal
B.3 Restriction against some
communication modes
B.4 Audio command codes (000)