PD 7027:1995

Committees responsible
Foreword
Specification
1. Scope
2. References
3. Definitions and abbreviations
4. General
5. Connection requirements
6. Electrical characteristics of interchange circuits
7. Safety
8. Electromagnetic compatibility
Annexes
A. (normative) Requirements table
B. (informative) Information for test purposes
C. (normative) General conditions of test
Tables
1. Connector pin designations for connection to X.21
     bis service at 2400, 4800, 9600 and 19200 bits/s
2. Connector pin designations for connection to X.21
     bis service at 48, 56 and 64 kbit/s
A.1 Requirements table for TE operating at 2400, 4800,
     9600 or 19200 bits/s
A.2 Requirements table for apparatus operating at 48,
     56 or 64 kbit/s using unbalanced double current
     interchange circuits conforming to CCITT
     Recommendation V.28
A.3 Requirements table for apparatus operating at 48,
     56 or 64 kbit/s using unbalanced double current
     interchange circuits conforming to CCITT
     Recommendation V.35
B.1 Identification of the implementation
B.2 Requirements table for TE operating at 2400, 4800,
     9600 or 19200 bits/s
B.3 Requirements table for apparatus operating at 48,
     56 or 64 kbit/s using unbalanced double current
     interchange, circuits conforming to CCITT
     Recommendation V.28
B.4 Requirements table for apparatus operating at 48,
     56 or 64 kbits/s using balanced double current
     interchange circuits conforming to CCITT
     Recommendation V.35
B.5 Environmental test conditions
B.6 Additional information about terminal equipment
C.1 Tolerances of components and physical quantities
List of references

Specifies the technical requirements under Section 22 of the Telecommunications Act 1984 for terminal equipment for connection to digital leased circuits of the public telecommunications network. Coverage includes: connection requirements, electromagnetic compatibility, and definitions and abbreviations. Also gives detailed tables and annexes.

This Published Document specifies the technical requirements under Section 22 of the Telecommunications Act 1984 for terminal equipment intended for connection to digital leased circuits of the public telecommunications network using CCITT Recommendation X.21 bis interfaces operating at data rates of up to 64 kbit/s. These technical requirements are aligned with Articles 4(c) to 4(f) of Directive 91/263/EEC. This Published Document does not contain any essential requirements for terminal-to-terminal operation via the public network.

This Published Document applies to all terminal equipment that is intended for connection to the form of access referred to above, irrespective of whether the terminal equipment provides additional interfaces, telecommunication services or functions.