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• CCITT Rec. Q.703 (11/1988) – SIGNALLING LINK
• 1 General
  • 1.1 Introduction
  • 1.2 Signal unit delimitation and alignment
  • 1.3 Error detection
  • 1.4 Error correction
  • 1.5 Initial alignment
  • 1.6 Signalling link error monitoring
  • 1.7 Link state control functions
  • 1.8 Flow control
• 2 Basic signal unit format
  • 2.1 General
  • 2.2 Signal unit format
  • 2.3 Function and codes of the signal unit fields
  • 2.4 Order of bit transmission
• 3 Signal unit delimitation
  • 3.1 Flags
  • 3.2 Zero insertion and deletion
• 4 Acceptance procedure
  • 4.1 Acceptance of alignment
  • 4.2 Error detection
• 5 Basic error correction method
  • 5.1 General
  • 5.2 Acknowledgements (positive acknowledgement and negative acknowledgement)
  • 5.3 Retransmission
• 6 Error correction by preventive cyclic retransmission
  • 6.1 General
  • 6.2 Acknowledgements
  • 6.3 Preventive cyclic retransmission
  • 6.4 Forced retransmission
• 7 Initial alignment procedure
  • 7.1 General
  • 7.2 Initial alignment status indications
  • 7.3 Initial alignment procedure
  • 7.4 Proving periods
• 8 Processor outage
• 9 Level 2 flow control
  • 9.1 General
  • 9.2 Detection of congestion
  • 9.3 Procedure in the congestion situation
  • 9.4 Congestion abatement procedure
• 10 Signalling link error monitoring
  • 10.1 General
  • 10.2 Signal unit error rate monitor
  • 10.3 Alignment error rate monitor
• 11 Level 2 codes and priorities
  • 11.1 Link status signal unit
  • 11.2 Transmission priorities within level 2
• 12 State transition diagrams and timers
  • 12.2 Abbreviations
  • 12.3 Timers