Abstract
Serial time division multiplex (TDM) databuses,while very flexible, are limited at high data rates by the transit time between terminals. The pauses in transmission necessary to allow for propagation delays reduce the effective data rate, and may cause problems with signals requiring rapid updating. We propose a hybrid protocol combining T.D.M. channels at low frequency with frequency division multiplexed channels carrying high speed data. A laboratory system using a 17 x 17 transmissive star has been constructed to demonstrate the feasibility of this approach, using TDM channels in the 0-10MHz band together with FDM channels in the 10-50MHz band.
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