BS 6639:1990
Superseded
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
Guide to DTE/DCE interface control operation using the 25 pole connector
Hardcopy , PDF
15-01-1996
English
31-10-1990
Committees responsible
National foreword
Guide
1. Scope and field of application
2. References
3. Switching to back-up operation
4. Contact number assignment
Annexes
A. State diagrams
B. Proposed new definition for interchange circuit 116
Figures
1. Back-up switching in "Direct Mode"
2. Back-up switching in "Authorized Mode"
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