Special Features:

Allows a number of oprs to have conference communication; has 4 identical circuits; ea circuit has a 6-wire connection to the epabx; two xmt audio lines, two rcv audio lines, one m-lead and one e-lead; ea circuit has an led to indicate when it is active and switches the audio signal from the associated subscriber

Properties:

An item which joins two or more two-way telephone circuits for conference use by utilization of electrical bridge principles. May include audio frequency amplifiers to nullify the transmission loss of the bridge circuit, and hybrid cell circuits for 2-wire termination of the telephone circuits.