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Extra resources for 3G Wireless Technology Quick Guide
Each sector of the antenna receives/transmits signals between itself and a specific customer location. This antenna is very small, often measuring only 12 inches in diameter. The hub antenna brings the multiplexed traffic down to an indoor switch, which processes the data into 53-byte ATM cells for transmission over the carrier’s fiber network. These individually addressed cells are converted back to their native format before going off the carrier’s network to their proper destinations—the Internet, PSTN, or the customer’s remote location.
When a line-of-sight signal between two stations is temporarily blocked, the MAU’s internal optical link control circuitry automatically changes the link’s path to get around the obstruction. When the original path is cleared, the MAU restores the link over that path. No data is lost during this recovery process. Figure 1-4 Line-of-sight versus diffuse configurations for infrared links Chapter 1 10 Diffuse links rely on light bounced off reflective surfaces. Because it is difficult to block all of the light reflected from large surface areas, diffuse links are generally more robust than line-of-sight links.
HomeRF is positioned as a global extension of Digitally Enhanced Cordless Telephony (DECT), the popular cordless phone standard that enables different brands to work together so certified handsets from one vendor can communicate with base stations from another. 4 GHz frequency band, which is also used by Bluetooth and Chapter 1 16 WiFi. 11 FHSS for data and DECT for voice. The standards for HomeRF are addressed by a consortium of vendors called the HomeRF WG. Under the HomeRF standard, compliant devices carry both voice and data traffic and interoperate with the Public Switched Telephone Network (PSTN) and the Internet.