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

2. Exemplu de circuit de separare
Basic Isolation Circuit
( switch-mode)
Exemplu de circuit de separare

3. BALUN = Balanced – Unbalanced Mode
Optocoupler Interface provides dual Light-Barrier to protect the transmitter
BALUN :
BALUN = Balanced – Unbalanced Mode

4. Semi-duplex Link Uses Optocouplers to Isolate Both Directions

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

6. Typically distorted rectangular wave shows reflections

7. Current Loop Variations in line-impedance are rejected

8. Signal Formats

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

10. Overvoltage protection clamp does not alter isolation and preserves tramsmission speed

11. Stronger Clamp recommended for higher current UTP links

12. Differential UTP communication also allows mutual protection of transmitting LEDs

13. Differential UTP-transmission also providing bi-polar clamp

14. For most reliable transmission Current-loop is recommended

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