Luokka Telekommunikaatiobulgariaenglantiespanjaesperantohollantiitaliajapanikreikkalatinalatvialiettuanorjaportugalipuolaranskaruotsisaksasuomitanskaturkkitšekkiunkarivenäjäviro

multiplexer multipoint multiuser N-facility network subsystem nonlandline nonrepudiation nonwireline OTP out-of-band overbuilder overmodulation PCS POP POTS presentity PRI primary rate interface proration PS PSDU pseudowire PSTN PTT QoS quantize

read readback receive refarming register RELP remote access REN reperforator reverse link ringback ringer equivalence number RJ roam roamable roaming ROIP round-trip delay time round-trip time router RTT saturation SDR semiduplex send signalling event

simplex software defined radio speedshift station-to-station structured wiring subcarrier subinterface super high frequency superband superframe supergroup switch switchboard switchroom T-carrier teleconference teledensity teledensity rate telephone conference text message trunk ultra high frequency video conference WAE wireline ZF