Control Way Station Equipment 4 Wire

This Control Way Station Equipment manufactured by Epsilon consists of a  wall mounted cabinet containing signal  reception, recognition, ringing and  ring back transmission circuit called   collectively Decoder and the Voice Communication Equipment.  It is housed in a rigid box, avoiding   any opening for dust etc. The front has a hinged door which, after opening gives access P.C. Board wired with Decoder  Circuit and Trans  / Receive Amplifiers. The Hand Micro Telephone is as  per  IRS-TC-38/97 with an LED lamp to indicate that  the station   is  called and a buzzer for  hooting while   the station is called.

It is possible to assign any DTMF code –1 to 99 and / or A, B, C, D by setting the DIP Switches I and II (10 Position) and III (4 Position) for A, B, C or D.  The PCB is clearly marked for identification 0 to 9, A, B, C and D etc. On receipt of the selected code, it shall decode and electronic buzzer shall hoot ad a red LED provided on the HMT is lighted.  The LED shall continue to be lit till the handset is lifted from the cradle.

Double cutting relay contacts for both Trans & Receive Amplifiers are provided apart from the Isolation Transformers, to isolate the line from the equipment. Ring-Back Tone of the required level shall appear in the Trans terminals. ‘MOVR’ based Surge Protection is employed across the RX Lines.

VOICE COMMUNICATION EQUIPMENT consists of a transmitter amplifier and a receiver amplifier.  The equipment is isolated from the lines using a relay and isolation transformers.  The gain of both the amplifiers is adjusted using presets.  The receive amplifier is switched on with the help of cradle switch i.e. it gets supply the moment handset is off the hook.  The Trans Amplifier with the aid of P.T.T. when handset is off the hook, is connected to the line. This decoder operates on 12 V DC.