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In this paper, radio relay systems for Synchronous Digital Hierarchy (SDH)-based networks with path type Synchronous Transfer Module of order 0 (STM-0) without protection switching and with 1+1 switching configuration as said in Recommendation ITU-R F.750 are considered. Byte Interleaved Parity (BIP) codes are used for error monitoring. Rain causes fading and the blocks are received in errors because of this fading and the SES may occur because of these errored blocks and the system may arrive in unavailable state.
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