BS 7362:1990

Foreword
Committees responsible
Specification
1. Scope
2. Abbreviations and definitions
3. TTA categories
4. General
5. Line interface
6. Signalling
7. Outgoing calls
8. BSP signals during message transmission
9. Automatic repeat attempts
10. Incoming call
11. Call clearing
12. Intermediate telex terminal apparatus (I-TTA)
13. Marking
14. Instructions for use
Appendices
A. Information to be provided by the supplier for
     test purposes
B. General conditions for test
C. Standard test procedures
D. General tests
E. Modem tests
Tables
1. Requirements and features specific to TO-TTA,
     RO-TTA, RT-TTA and FE-TTA
2. Message storage and security features specific
     to RT-TTA and RO-TTA
3. Power and voltage levels
4. Telegraph characters
5. Tolerances
6. Exchange simulator transmission
7. Exchange simulator transmission
Figures
1. Power and voltage limit curves
2. Measurement of longitudinal output
3. Exchange simulator transmission: PTS discrimination
     and commencement of selection
4. Exchange simulator transmission: call collision
     and response to WRV signal
5. Exchange simulator transmission: commencement of
     SPC selection
6. Measurement of transmit distortion
7. Deviation of d.c. wetting current
8. SCVF I-TTA automatic changeover
9. Test circuit for measuring transmit frequency and
     output signal power
10. Measurement of receiver margin
11. Measurement of received signal level
12. Receive signal level attenuation
13. Measurement of return loss and transverse power
     level limits
14. Measurement of longitudinal conversion loss
15. Transverse conversion loss
16. Measurement of DC resistance

Requirements to ensure compatibility with UK public telecommunications operators and other terminals connected to telex networks.