Digital central

The digital central JJKU is the basic structural element of the verbal communication among the users. In the theatres it is usually used for assuring of the interconnection of the communication terminal and 100V sound radio. It is built in the 19" metal case, which is 2U high. In case of connection in the radio it is added as a part of a switch board of the 100V sound radio, which containes in addition amplifier circuits, microphone distributors and other implemental components.

The principle of the communication comes under these three implemented modules: communication module, reporting module and gong module

Communication module

It mediates an unidirectional communication between the terminals. During the two-member-conversation, one of them is transmitting and the second receiving. At the same time the transmitting one can also receive a call from another person. Generally the unidirectional paralel communication is happening. In the basic implementation the central is able to connect as many of 15-ending terminals.

Reporting module

In the quiescent condition this module provides mostly the monitoring of the stage and this he distributes to 100V sound radio*. When requierement from the terminal comes, reporting module disconnects the monitoring of the stage and it broadcasts this terminal to the sound radio*.

* the broadcasting to the backstage

Gong module

The central containes a memory, where it is possible to encode the very sound record. This record is then broadcasted to the public part of the 100V sound radio.

A structured cableway ended up by the standard RJ45 connectors provides the connection between the terminal and the central.

Basic descriptions

Feeding 230V / 50/60 Hz
Number of terminals to conect 15 (for connectors RJ45)
Number of the gongs 1
Connector Gong Jack 6,3 (output)
Connector Monitoring Jack 6,3 (input)
Connector Monitoring/Report Jack 6,3 (output)
Size 482x88x390 mm
Weight 6,3 kg


Communication terminals

The communication terminals JJKT and JJBP4 are belong to the class of the end communication appliances. They have the same function, but they differ in particular in the way of using.

Communication terminal JJKT

JJKT which is built in the small metal case is intended for being on the table. On the front, slightly skewed part, there are 16 connecting buttons and sound reproducer with the volume adjuster. A regulable microphone is on the top part.

The buttons have removable plates for individual setting . You can set up the configuration for the particular terminal in regard of the position in the communications network. In reference to the connection in the digital central JJKU, 14 buttons are intended for communication with other stations, the remaining two buttons are appointed to the gong and the radio announcement.

For the "quiet" conversation it is possible to link headphones with a microphone to the slots in the back panel of the JJKT. The connection with the web is provided by a cable ended with the RJ45 connector. In case of necessity JJKT itself could be built in some bigger units, such as operative or stage manager boards.

Communication terminal JJBP4

JJBP4 is primarilly intended for hanging alongside the waist, so it is made from very light plastic and it has a hanging fastener. As well as JJKT, it should be connected with the communication web by the cable. But it provides a considerable freedom of movement to the client because of its suspension and size. It comes in useful for the assistant stations, which are supposed to just receive the communication or in cases when the worker needs to use his hands for anything else (like service of the spotlight). That´s why the number of the cables on the JJBP4 was reduced to 4. The voice output and input pass off at the hand of connected headphones with the microphone.

Basic descriptions

Number of the communication channels 14 4
Gong yes no
Report to the sound radio yesno
Connector RJ45 RJ45
Headphones' connector 2 x jack 3,5 2x jack 3,5
Size 217x55 (+microphone) x220 mm  
Weight 1,3 kg  



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