NTT is putting efforts into digitalization of transmission routes for realizing ISDN.As 50 per cent of long-haul transmission routes in Japan are microwave radio systems,digitalization of these routes have been pursued.However with radio transmission routes,intervals exist where the propagation conditions are severe in certain parts.To introduce digital microwave radio for these intervals,studies for upgrading high quality are being conducted.This paper describes the technology for upgrading the quality of digital microwave radio.
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