What is CDPD?
| Technology: | CDPD (Cellular Digital Packet Data) |
| Purpose: | System used to transmit data over analog cellular networks |
| Frequency: | 800MHz, 1,900MHz |
| Range: | Coverage area of host network |
| Speed: | 19.2Kbps |
| Devices: | Cellular phones, PDAs, pagers |
| Compatibility: | na |
| Cellular Digital Packet Data |
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A technology used to send digital data over vacancies in the existing analog voice network. CDPD uses RC4 airlink encryption, so is very secure, and offers theoretical throughput of 19.2Kbps. A digital wireless transmission system that is deployed as an enhancement to the existing analog cellular network. Based on IBM's CelluPlan II, it provides a packet overlay onto the AMPS network and moves data at 19.2 Kbps over ever-changing unused intervals in the voice channels. If all the channels are used, the data is stored and forwarded when a channel becomes available. CDPD was developed as a wireless extension to an IP network and uses the four octet (0.0.0.0) address for connections. CDPD networks cover most of the major urban areas in the U.S. and has been deployed by AT&T, Ameritech, GTE, BellAtlantic Mobile and other carriers. By the late 1990s, incompatibility issues had been worked out, and roaming agreements and interoperability between carriers is generally nationwide. CDPD modems are available on PC Cards for laptop and handheld computers. |
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