Abstract
ccitt has standardised a new synchronous interface named sdh (Synchronous Digital Hierarchy). Considering the importance of transmission-medium compatibility between radio and optical fibre systems, Alcatel Telspace has developed sdh based digital radio systems. In order to provide a direct access to all the section overhead bytes (soh) in the stm-1 frame and the insertion/extraction of radio overhead bytes for media specific usage, two cmos integrated circuits were designed, operating in a parallel process at 40 MHz data rate, in order to respect a full transparency criterion, necessary for a short synchronisation time on the whole radio link.
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