UTP / STP  Links  Using Optocouplers as Isolators
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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 :.

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Exemplu de circuit de separare

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UTP / STP Links Using Optocouplers as Isolators Transmisii de date pe cabluriUTP / 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 :

BALUN = Balanced – UnbalancedMode


Semi-duplex Link Uses Optocouplers to Isolate Both Directions


Serial Interface Takes 4-Optocouplers to Achieve Bi-directional Communication


Typically distorted rectangular wave shows reflections


Current LoopVariations in line-impedance are rejected


Signal Formats


Simple : Unbalanced termination of an UTP linkuses a voltage signal for transmission, and an optocoupler to isolate the receiver from the line


Overvoltage protection clampdoes not alter isolation and preserves tramsmission speed


Stronger Clamprecommended for higher current UTP links


Differential UTP communication also allows mutual protection of transmitting LEDs


Differential UTP-transmission also providing bi-polar clamp


For most reliable transmission Current-loop is recommended


Current-mode link termination can be easily made bi-polar by using a Graetz-bridge


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