Digital intercom equipment
Different types of digital intercom devices can be divided into several types: cost, DPMR, TETRA, cloud intercom.
DPMR: The lowest cost, widely used with amateur users, hotel travel catering and other scenarios. DMR: High cost, suitable for industry users, such as mining, forestry, security, etc.
TETRA: The most cost-effective, suitable for occasions with high security requirements, such as the military, public security and so on.
Cloud intercom: low cost, based on public network digital signal transmission, suitable for a wide range of industries.
dPMR (digital Private Mobile Radio) is a standard digital walkie-talkie standard developed by ETSI. Applicable to commercial, professional and public safety users; dPMR uses 6.25KHz FDMA technology, 4FSK modulation, data transmission rate of 4.8Kb / s. Based on this technology, standards such as NXDN and DCR have been developed in succession.
The PDT standard is a cluster communication standard with China's independent intellectual property rights. It focuses on the future development of digital intercom technology and can meet the needs of users in most cluster communication industries. The PDT standard fully considers China's national conditions and draws on the internationally mature standard technologies (such as Tetra, P25, DMR, MPT1327, etc.) for reference and innovative design, following cost-effective, secure and confidential, large-area system, scalable and backward compatible. The five principles have effectively solved the problem of multiple emergency communication network convergence communications.
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