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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Exemplu de circuit de separare

UTP / STP Links Using Optocouplers as Isolators Transmisii de date pe cabluriUTP / STP cu separare prin optocuploare


Exemplu de circuit de separare

Exemplu de circuit de separare

Basic Isolation Circuit

( switch-mode)


Optocoupler interface provides dual light barrier to protect the transmitter

Optocoupler Interface provides dual Light-Barrier to protect the transmitter

BALUN :

BALUN = Balanced – UnbalancedMode


Semi duplex link uses optocouplers to isolate both directions

Semi-duplex Link Uses Optocouplers to Isolate Both Directions


Serial interface takes 4 optocouplers to achieve bi directional communication

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


Typically distorted rectangular wave shows reflections

Typically distorted rectangular wave shows reflections


Current loop variations in line impedance are rejected

Current LoopVariations in line-impedance are rejected


Signal formats

Signal Formats


Exemplu de circuit de separare

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


Overvoltage protection clamp does not alter isolation and preserves tramsmission speed

Overvoltage protection clampdoes not alter isolation and preserves tramsmission speed


Stronger clamp recommended for higher current utp links

Stronger Clamprecommended for higher current UTP links


Differential utp communication also allows mutual protection of transmitting leds

Differential UTP communication also allows mutual protection of transmitting LEDs


Differential utp transmission also providing bi polar clamp

Differential UTP-transmission also providing bi-polar clamp


For most reliable transmission current loop is recommended

For most reliable transmission Current-loop is recommended


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

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


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