Transmission Technologies in Secondary Hub Rings- SONET versus FDM Once More (1996)
By Thomas G. Elliot, TCI Cable Management Corporation and Oleh J. Sniezko, TCI Communications, Inc.
The choice of architecture and transmission technology for signal delivery from primary hub rings to clusters of coaxial buses with 125 to 500 homes passed per bus is a subject of an ongoing debate. This paper presents an analysis of the several transmission technologies suitable for these links, and namely:
- dedicated fiber delivery system (simple FDM technology) from the
- primary hub ring to the coaxial bus (ring-star-bus);
- FDM technology with block conversion for targeted services;
- hybrid FDM (for all broadcast signals) and SONET (for targeted services);
- hybrid FDM (for analog broadcast signals) and SONET (for all digital signals).
The impact of the following factors on the results of the analysis are considered:
- service requirements;
- architectural requirements;
- capital and operating costs;
- future-proof level of the architecture and transmission technology.
The results of the analysis can be used in selecting a solution suitable to a particular set of requirements and a size of the system. The authors also present their vision of the future and TCI's technology of choice at this point in time.
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