| 单词 | PXC (photonic cross-connect) |
| 释义 | PXC (photonic cross-connect) encoding is adaptive differential pulse code modulation (ADPCM) at 32 kbps. PWT supports call handoff, so users can roam from cell to cell at pedestrian speeds as long as they remain within range of the system. PWT antennas can be equipped with optional spatial diversity to deal with multipath fading. Security is provided through authentication and encryption mechanisms. PWT/E is an extension into the licensed bands of 1850–1910 MHz and 1930–1990 MHz. The PWT specification was developed by the Telecommunications Industry Association (TIA). See also ADPCM, antenna, authentication, carrier, channel, cordless telephone, DECT, digital, encode, encryption, ETSI, FDM, handoff, modulation, multipath fading, /4 DQPSK, PWT/E, spatial diversity, TDD, TDMA, and TIA. |
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