Clear-Com EF-701M - Manual (Page 49)

E F - 7 0 1 M I N T E R F A C E 4 - 3
Null : (noun) 1. Adjustment on the intercom that controls the amount of sidetone heard
by the operator. 2. The degree of sidetone adjustment. (verb) To adjust the amount of
sidetone heard by the intercom operator.
Party Line : Intercom channel on which each member can both listen and speak to every
other member on the channel. Analogous to a telephone conference call with its full
duplex (talk and listen) communication.
PL : Abbreviation for Party Line.
RS-422: A balanced asynchronous data connection.
Sidetone : The sound of your own voice transmitted through an earphone as you speak.
Termination: A fixed load placed upon the Clear-Com party line to maintain stability.
Two-wire audio : A single shielded-pair cable carrying a single channel of bidirectional
(talk and listen) audio.
TW : Two channels of bidirectional (talk and listen) audio that are carried on a single
shielded-pair cable.