| 单词 | HomePlug |
| 释义 | HomePlug A set of standards for in-house broadband over power line (In-house BPL). HomePlug allows a device to connect to a LAN directly through the in-building low voltage (LV) electric lines (110 volts at 50–60 Hz, or 220 volts at 50 Hz). Loosely based on Ethernet standards and using a variation of the CSMA/CA access control technique, HomePlug 1.0 supports up to 16 nodes sharing bandwidth up to a theoretical maximum of 14 Mbps. HomePlug-compatible devices include PCs, routers, bridges, switches, and any other devices that use RJ-45 or universal serial bus (USB) physical interfaces. The devices plug into a HomePlug adapter that is about the size of a typical LV transformer or power adapter, and that plugs into any electrical outlet on the premises. HomePlug uses of a version of orthogonal frequency division multiplexing (OFDM) specially tailored for powerline environments. HomePlug 1.0 specifies 84 equally spaced subcarriers, within each of which several differential modulation techniques are employed. Security is through 56-bit Data Encryption Standard (DES). Attenuation in HomePlug networks is influenced not only by signal propagation through the copper conductors, but also by splices and various components such as fuse boxes, surge suppressors, and circuit breakers. HomePlug currently offers a range of as much as 300 meters without repeaters and deals with issues of electromagnetic interference (EMI) through the mechanisms of forward error correction (FEC) and automatic repeat request (ARQ). See also Access BPL, bandwidth, BPL, broadband, CSMA/CA, DES, EMI, Ethernet, FEC, In-house BPL, LAN, modulation, LV, OFDM, propagation, RJ45, subcarrier, transformer, and USB. |
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