Tandem Trunk, Idle-Line Termination.
a . P u r p o s e . The purpose of this test is to verify that the
trunk applies 600-ohm idle-line termination when idle.
b . Test Equipment and Materials. The following equipment is
required for this test.
( 2 ) A C V o l t m e t e r , Hewlett-Packard 403B.
(3) Dummy plugs, three-wire, ADC Products (or equivalent).
(4) Clip leads.
Test Connections and Conditions
If the equipment must be
kept in continuous operation, perform this test during periods of
Do not test busy circuits.