ST connectors have a key which prevents rotation of the ceramic ferrule. The ST is one of the older generations of connector, but is still widely used for multimode networks, especially LANS.
Specifications:
Insertion Loss: ≤30dB for SM & MM
Return Loss: ≥50dB for SM
≥30dB for MM
Durability: ≤0.2 dB typical change, 1000 matings
Features:
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Standards of IEC, Bell core
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High Reliability and Stability
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High Return Loss and Low Insertion Loss
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Bayonet style housing for easy termination
Applications:
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Local Area Networks (LANS)
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Data Processing Networks
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Premise Installations
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Instrumentation