IEEE 269-1966
Methods for Measuring Transmission Performance of Telephone Sets

Standard No.

IEEE 269-1966

Release Date

1966

Published By

IEEE - The Institute of Electrical and Electronics Engineers@ Inc.

Status

Be replaced 2016-01

Replace By

IEEE 269-1971

Latest

IEEE 269-2019

Scope

SCOPE AND PURPOSE The purpose of this Standard is to describe a practical and reproducible method for measuring the transmission characteristics of a telephone set@ and the components thereof@ by means of objective measurements in a test connection. Performance characteristics obtained using this method will approximate but will not duplicate performance under actual use conditions. The method requires a suitable Artificial Mouth. It also specifies a standard Artificial Ear@ standard circuits comprising direct-current power feed and connecting loops@ and a standard pressure microphone. This Standard is intended for use in measuring the transmission characteristic over the frequency range most useful for speech@ e.g. 150 to 5000 hertz. It is to be used for single-frequency measurements and for measurements with continuously varying frequencies such as slow sweeps and warble bands. It is suitable also for measuring the transmission performance of conventional telephone sets equipped with handsets using carbon transmitters and used with 2-wire circuits. It is not intended to be applicable to special devices such as noise-exclusion transmitters@ distant-talking transmitters@ insert-type receivers@ or noise-exclusion receivers equipped with large ear pads. This Standard is basd on a standard pressure microphone to measure the sound field produced by the Artificial Mouth and to measure the pressure developed in the Artificial Ear. Drawings and test procedures as well as other pertinent information have been included as an aid to designers in setting up the tests.

IEEE 269-1966 history

• 1970 IEEE 269-2019 Methods for Measuring Transmission Performance of Analog and Digital Telephone Sets, Handsets, and Headsets
• 2010 IEEE 269-2010 Methods for Measuring Transmission Performance of Analog and Digital Telephone Sets, Handsets, and Headsets
• 2002 IEEE 269-2002 Standard Methods for Measuring Transmission Performance of Analog and Digital Telephone Sets@ Handsets@ and Headsets
• 1992 IEEE 269-1992 Standard methods for measuring transmission performance of analog and digital telephone sets
• 1970 IEEE 269-1983 IEEE Standard Method for Measuring Transmission Performance of Telephone Sets
• 1971 IEEE 269-1971 Methods for Measuring Transmission Performance of Telephone Sets
• 1966 IEEE 269-1966 Methods for Measuring Transmission Performance of Telephone Sets