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NEC's 500 Series SDH (synchronous digital hierarchy) Microwave Radio Systems cover frequency from 4 to 11 GHz for long-haul transmissions, the same as the 3000S.
The 5000S is designed using the latest technology and has a footprint which is only half that of the 3000S, so, with a complete repeater system in one ETSI rack, the 5000S can equip up to 10 systems wit its complete repeater system.