IEC 60834-1:1988

Applies to narrow-band (max. 4 kHz) teleprotection equipment, both single-signal and multi-signal. Also applies to voice-frequency equipment used with various telecommunications systems, such as power line carrier (PLC), radio links, rented circuits and leased or owned cables. Establishes performance requirements and test methods for testing channels used for transmitting command information required by protective devices in power systems, and gives the associated terminology.