 | | [X.20] Recommendation X.20 (11/88) - Interface between data terminal equipment (DTE) and data circuit-terminating equipment (DCE) for start-stop transmission services on public data networks
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| | Table of Contents | ITU-T Rec. X.20 - INTERFACE BETWEEN DATA TERMINAL EQUIPMENT (DTE) AND DATA CIRCUIT-TERMINATING EQUIPMENT (DCE) FOR START-STOP TR
NOTES
INTERFACE BETWEEN DATA TERMINAL EQUIPMENT (DTE) AND DATA CIRCUIT-TERMINATING EQUIPMENT (DCE) FOR START-STOP TRANSMISSION SERVICES ONPUBLIC DATA NETWORKS
1 Scope
2 DTE/DCE physical interface elements
2.1 Interchange circuits
2.2 Electrical characteristics
2.3 Mechanical characteristics
2.4 Fault conditions of interchange circuits
3 Call control characters and error checking
4 Elements of the call control phase for circuit switched service
4.1 Events of the call control procedures
4.2 Unsuccessful call
4.3 Call collision (state 19)
4.4 Direct call
4.5 Facility registration/cancellation procedure
4.6 Selection, call progress and DCE provided information formats
5 Data transfer phase
5.1 Data transfer (state 12), point-to-point circuit switched service
5.2 Data transfer, leased circuit service
5.3 Data transfer (state 12), centralized multipoint circuit-switched service
6 Clearing phase
6.1 Clearing by the DTE (states 13, 14, 15)
6.2 Clearing by the DCE (states 16, 17, 15)
6.3 DCE ready (state 1)
6.4 Clear collision
7 Test loops
7.1 DTE test loop - type 1 loop
7.2 Local test loop - type 3 loop
7.3 Network test loop - type 2 loop
ANNEX A - Interface signalling state diagrams
213
ANNEX C - DTE time-limits and DCE time-outs
C.1 DTE time-limits
C.2 DCE time-outs
ANNEX D - Formats of Selection, Call Progress, and DCE-provided information signals
ANNEX E - Coding of call progress signals
ANNEX F - Facility request, indicator, and parameter coding
F.1 Multiple address calling
F.2 Charging information
F.3 Redirection of call
F.4 Reverse charging
F.5 Abbreviated address calling
F.6 DTE inactive registration/cancellation
ANNEX G - Information content of DCEprovided information
G.1 General
G.2 Information content of calling and called line identification
G.3 General coding of the DCE provided information
G.4 Information content of charging information
G.5 Date and time indication
G.6 Characteristics of the call
G.7 Type of call indication
G.8 Closed user group indication
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