Parallel phone lock. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Telephony
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If there are no free numbers on the PBX, you can install a parallel telephone. This issue is easily resolved by the communication enterprise with the consent of the main subscriber, but there is a possibility of subscribers listening to each other. This can be avoided by applying the proposed blocker. The device is made on the basis of an industrial interlock of a coupled subscriber set (SAK) ATSK 50/200, ATSK 100/2000.
The advantages of this scheme:
- the polarity of the telephone line connection does not matter;
- if one of the subscribers picked up the handset from the telephone set and started dialing, the other subscriber cannot take the line;
- the device is not afraid of overvoltage in the line (thunderstorms), as it does not contain semiconductor devices, which is especially important for rural telephone networks.
Consider the operation of the blocker in various modes.
Outgoing connection. Let subscriber 1 pick up the telephone first. A circuit is formed: terminal 3 - relay contacts K2.1 - relay coil K1 - subscriber 1 telephone - relay contacts K2.2 - terminal 4. At the same time, relay K1 is activated and disconnects subscriber 2 from the telephone line with its contacts.
When subscriber 1 dials, relay K1 does not have time to operate during the short-term opening of the loop by the impulse contact of subscriber 1's telephone. After the conversation, subscriber 1 hangs up the telephone, relay K1 releases, and the circuit returns to its original state.
The operation procedure for subscriber 2 is similar, only relay K2 is activated and disconnects subscriber 1.
Incoming connection. When a call is received from the line, relays K1 and K2 do not work, since they are shunted by capacitors C1 and C2. The bell rings in the telephone sets of both subscribers. If subscriber 1 was the first to pick up the handset of the telephone set, then relay K1 is activated and disconnects subscriber 2 from the line with its contacts. If subscriber 2 was the first to pick up the phone, relay K2 is similarly activated and disconnects subscriber 1 from the line. After the end of the conversation, when the subscriber hangs up the telephone set, the corresponding relay releases, and the circuit returns to its initial state.
Relays K1 and K2 - from the industrial blocker ATSK 50/200 (ATSK 100/2000). But these relays can be made independently, taking as a basis any type of on-load tap-changer with breaking contacts. The standard relay has 2 windings. Winding 1-2 can be short-circuited for better release deceleration.
As a housing, you can use the housing of the ATSK 50/200, ATSK 100/2000 blockers or make any other. The relay must be installed so that the plane of the relay anchors is perpendicular to the ground.
The blocker, assembled according to the proposed scheme, has been working from ATS 50/200 for almost a year, and there were no failures in operation.
Author: A. Domanchuk, Bobruisk; Publication: N. Bolshakov, rf.atnn.ru
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