Trunked Simulcast System Overview Sample Clauses

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Trunked Simulcast System Overview. Continuous Coverage‌ Simulcast provides continuous coverage over a large geographic area (wide area) using a single set of frequencies. In a simulcast system, all sites have the same set of frequencies. The same channel is the control channel at every transmit site. Overlap Zone‌ The challenge of a simulcast system is to provide high quality signaling to radios in the overlap zone. An overlap zone is the geographic region where two or more signals of comparable power are received by a single radio. To understand the overlap zone and its significance, an understanding of the concept of capture and non-capture zones is necessary. The simulcast coverage area contains two types of areas: those captured by a single site and those hearing two or more sites of approximately equal RF signal level.  Capture Zones – A radio (receiver) is captured by an RF signal when the mean signal level is higher than other RF signal sources by a margin strong enough to suppress the weaker signal’s modulation product so that data errors (missing data/voice frames) created by the mixing of the two signals do not disrupt the intended data stream from the mean signal.  Non-Capture Zones – In the "non-capture" or "overlap" zone, the mobile receiver accepts two or more signals. These signals mix randomly producing stronger or weaker signals. If one site’s received mean signal power level is within several decibels of other sites’ on-frequency modulated signals, audio intermodulation and distortion may occur. Audio distortion increases to a maximum when the received carrier signals are equal. In digital communications the distortion can cause data errors and result in distortion or missing voice (data) frames. Good communication in these areas is maintained by precision system synchronization and equalization. Control Point Basics‌ The Control Point is the central point for system control. The Control Point provides the necessary interfacing between two or more transmit sites and dispatcher locations. Timing references for outbound (transmit) data are generated here and sent to each transmit site and selection of the best quality inbound (receive) data from each site is managed by the Control Point equipment. Outbound (Transmitter) Signaling‌ Timing (or delay) for the outbound transmissions is adjusted by each transmit site to make the timing reference signals from the Control Point and transmit site match. Control of the exact time the common outbound signal is transmitted from each Tran...
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Related to Trunked Simulcast System Overview

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  • Network Interconnection Architecture Each Party will plan, design, construct and maintain the facilities within their respective systems as are necessary and proper for the provision of traffic covered by this Agreement. These facilities include but are not limited to, a sufficient number of trunks to the point of interconnection with the tandem company, and sufficient interoffice and interexchange facilities and trunks between its own central offices to adequately handle traffic between all central offices within the service areas at a P.01 grade of service or better. The provisioning and engineering of such services and facilities will comply with generally accepted industry methods and practices, and will observe the rules and regulations of the lawfully established tariffs applicable to the services provided.

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  • System Use (a) An electronic site access system may be used on site, subject to the requirements of this statement. (b) The system operates via: (i) a facial recognition device; and (ii) an electronic gate. (c) The system will be installed at the access and egress point/s of the site and will only be utilised to identify presence on site. (d) The purpose for which the electronic site access system will be implemented is to ensure: (i) avoiding unauthorised access to site; (ii) confirmation and co-ordination of effort in emergency situations; and (iii) confirmation that all entrants to site have received a site specific induction; (e) The only personal data collected by the system is a site entrant’s: (i) image; (ii) first & last name; (iii) mobile phone number; (iv) email address; and (v) employer’s name. (the Collected Data) (f) The Collected Data will only be held or used for the purposes specified above, unless otherwise by consent or required by law. (g) The Employer will not use the electronic site access control system to verify who was on a site at a particular time for the purpose of: (i) evaluating whether a variation claim regarding labour costs made by a subcontractor can be substantiated; (ii) taking disciplinary action against an Employee, or assisting a subcontractor to take disciplinary action against its own employees, regarding their start and finish times; or (iii) otherwise generally tracking a worker’s movements whilst on the site.