Access services and private line restoration using microwave radio facilities

Short-haul applications of digital radio in access services, customer premise communications, and restoration scenarios are discussed. It is noted that AT&T currently markets four different types of digital radio systems for these purposes: DR18W, DR23W, DR18M, and DR23N. Operating in the 18- and 23-GHz ranges, these radio systems provide high-quality communications links with capacities ranging from 1.544 MB/s to 45 MB/s. These systems are typically used for line-of-site links up to 15 miles long and carry all types of digital services including voice, data, facsimile, video, and any combination of the above. In cases where a direct link between the end customer and AT&T is established, the radios not only provide network-quality reliability, but also enhanced maintenance and administration features, enabling AT&T to maintain both terminals as an extension of the long-distance network