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| Mine-used Wire/Wireless Communication |
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Employing digital exchange network, two-stage decentralization control by computer, Model KTJ4H Digital Program-controlled System for Dispatching and Communication integrates dispatching and commanding, computer network and office automation together, and is suitable for commanding, dispatching and communication for enterprises and public institutions of coal mine and other industries. |
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Powerful dispatching functions such as single-key direct calling, transferring, forced cut-in, forced break, conference, hold-on, group call, night service and so on. |
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The system supports large-scale conference up to 48-parties. |
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The system can set up multiple dispatching desks, which showing number and unit name of incoming call on plasma screen and setting bureau data of the system. |
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Equipped with touch screen, the dispatching desk can realize computerized dispatching. |
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The system provides multi-interfaces for digital trunk £¨2B + D, 30B + D£©, carrier trunk, E/M trunk and loop trunk, etc., which can form multi-level special network or dispatching network in digital or digital-analog mode, realizing equal-length dialing. |
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The system is convenient for centralized maintenance with multi-level special network or dispatching network. |
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The system supports multi-type terminals including normal automatic telephones, I.S. automatic telephones, surface amplifying device. |
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The system has functions of internal user limitation, multi-level authority and multi-level priority, and high-level user can cut in low-level user. |
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The system has functions of music hold and validation, and computerized operator. |
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The extension telephone has functions of giving number and time; |
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The signal standard, transmission standard, synchronization mode and charging feature of the system conform to standards issued by the Ministry of Posts and Telecommunications, and the system also can provide new-version software according to requirements of different communication network. |
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Capacity:
16  3000 optional (Users: 64, 80, 128, 208, 256, 512, 1024, 2048, each board with 16 users; Trunks: 16, 32, including 2 loop trunks (each board with 16 channels), 4 E/M trunks (each board with 4 channels) and PCM digital trunks (each board with 32 channels, No.1 Signal, with 6 MFC signals) |
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Transmission:
Transmission attenuation from extension to extension or from
trunk to extension: 2 7 dB;
Frequency characteristics of attenuation:
| 300400 Hz |
-0.62 dB |
| 400600 Hz |
-0.61.5 dB |
| 6002 400 Hz |
-0.60.7 dB |
| 2 4003 000 Hz |
-0.61.1 dB |
| 3 0003 400 Hz |
-0.632 dB |
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Nonlinear distortion: -45+3 dB, level<0.2 dB |
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Unbalanced to ground:  40 dB(300600 Hz), 46 dB(6003 400 Hz) |
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