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AN2053 Datasheet(PDF) 7 Page - STMicroelectronics |
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AN2053 Datasheet(HTML) 7 Page - STMicroelectronics |
7 / 15 page AN2053 Long line protection Doc ID 10917 Rev 2 7/15 4 Long line protection The long line concept is used in case of the classic wired telecom network. With this topology, the core of the system is a huge central office from where many lines connect the subscribers. In this case the line length can reach several kilometers. This type of subscriber based on silicon integrated SLIC can be classified in two families: ● With external ring signal management ● With internal ring signal management The classical one uses a mechanical relay to manage either ring generation or speech mode. Figure 9. SLIC with external ring signal management Figure 9 shows the protection circuit of a SLIC with mechanical ring relay. The protection function is implemented in two stages. One is located between the line and the ring relay, while the other is located between the ring relay and the SLIC. The first stage, dedicated to the ring generator protection, supports a three-way protection (THBTxxx11D for 30 A applications or TLPxxx for 100 A requirements). This stage acts symmetrically at + or - V (For example +/-200 V) where V is chosen as slightly higher than the maximum ring voltage trip. The goal of the second stage is to manage a fine protection level in phase with the requirements of the high integration technology modern SLIC. This stage must switch on for a voltage higher than the voltage supply of the SLIC. The resistors referenced by (**) allow the LCP15xx to manage both 100 A and 50 A applications when no resistance is permitted at the PTC or fuse stage. In this case, when a surge occurs the LCP15xx starts to act and before the current becomes too high in the LCP15xx, the drop voltage across the resistor (**) allows the TLPxxx device to be fired. Then all the surge current flows through the TLPxx device. The resistors referenced (*) are not mandatory and are added when the SLIC to be protected is very sensitive to the latch up phenomena. SLIC Ring generator Tip Ring -V bat Mechanical relay THBTxxx11D or TLPxxx PTC or Fuse PTC or Fuse (**) (**) LCP1521S (**) Used for 100A version (*) Not mandatoy (*) (*) |
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