exemplu de circuit de separare
DESCRIPTION
UTP / STP Links Using Optocouplers as Isolators Transmisii de date pe cabluri UTP / STP cu separare prin optocuploare. Exemplu de circuit de separare. Basic Isolation Circuit ( switch-mode). Optocoupler Interface provides dual Light-Barrier to protect the transmitter. BALUN :. - PowerPoint PPT PresentationTRANSCRIPT
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UTP / STP Links Using
Optocouplers as Isolators
Transmisii de date pe cabluri
UTP / STP cu separare prin
optocuploare
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Exemplu de circuit de separare
Basic Isolation Circuit ( switch-mode)
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Optocoupler Interface provides dual Light-Barrier to protect the transmitter
BALUN :
BALUN = Balanced – Unbalanced Mode
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Semi-duplex Link Uses Optocouplers to Isolate Both Directions
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Serial Interface Takes 4-Optocouplers to Achieve Bi-directional Communication
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Typically distorted rectangular wave shows reflections
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Current Loop
Variations in line-impedance are rejected
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Signal Formats
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Simple : Unbalanced termination of an UTP link
uses a voltage signal for transmission, and an
optocoupler to isolate the receiver from
the line
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Overvoltage protection clamp
does not alter isolation and preserves tramsmission speed
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Stronger Clamprecommended for higher current UTP links
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Differential UTP communication also allows
mutual protection of transmitting LEDs
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Differential UTP-transmission also providing bi-polar clamp
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For most reliable transmission Current-loop is recommended
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Current-mode link termination can be easily made bi-polar by using a Graetz-bridge