Communication equipment
Performance
Analysis of variance
Radio links
Telephone transmitters
Numerical designations
Telecommunication systems
Signal level
Telephony
Instructions for use
Testing conditions
Sound intensity
Telephones
Cordless telephone equipment
Electric current
Electric pins
Reception
Marking
Telephone equipment
Noise (spurious signals)
Communication procedures
Sensitivity
Radiocommunication
Test equipment
Telecommunication
Voltage
Radiotelephony
Telephone networks
Speech transmission systems
Portable
Impact testing
Radio receivers
Telephone receivers
Volume (sound)
Circuits
Acoustic measurement
Electrical wave measurement
Performance testing