RF Modem Specifications - Testing Between The Lines (1984)
By Kenneth c. Crandall, Zeta Laboratories, Inc.
The RF modem, used for both voice and data communications on CATV systems, is becoming an important tool for increasing cable operators' revenues. However, any new device added to the network must be tested to see that it meets its specifications. It also must meet certain unwritten specifications that guarantee that it reliably operate under a variety of real world impairments known to exist; such as mechanical shock, frequency translator drift, and intermodulation distortion. Simple tests are presented that help identify a potentially poor performing device and keep it from eroding into those higher revenues gained by offering voice and data communications services.
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