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TC04A-200 Arkusz danych(PDF) 4 Page - Semtech Corporation |
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TC04A-200 Arkusz danych(HTML) 4 Page - Semtech Corporation |
4 / 8 page 4 ã 2000 Semtech Corp. www.semtech.com PROTECTION PRODUCTS PROTECTION PRODUCTS TC04A-200 SLIC Operating Voltages (Unbalanced Ringing) Balanced Ringing SLIC protection Concepts Transient immunity standards require telecommunica- tions equipment be surged in all of its operating states. This refers to the on-hook state (ring generator or ring detection monitoring) and the off-hook state (operational state). The On-Hook state must allow for operation of the normal battery voltage and ring voltage without interference. The Off-Hook state only allows for operation of the battery voltage plus opera- tion signals. Several SLIC types exist. The first type of SLIC requires an external ring relay to disconnect the SLIC and connect the ringing and trip bias power supply generat- ing the ringing signal. Protection must be provided for the subsystem which includes the ringing relay and ringing source. This type of ringing is sometimes called unbalanced ringing. The ringing voltage is typically inserted on the Ring (B-lead), while the Tip (A-lead) is grounded. The SLIC may or may not be protected by the ringing subsystem protection. Separate subsystem protection may be needed and must have a minimum operating voltage that exceeds the battery voltage and the ring signal voltage. The SLIC IC is disconnected from the line and the ring generator and does not see the ringing voltages. Therefore, the protection element for the SLIC must only have a minimum operating voltage greater than the battery supply voltage. This device must suppress all transients above ground and below the battery voltage. The second SLIC type has an integrated ring generation capability. The protection device described in this application information is particularly suited for use with this SLIC type. Unlike the unbalanced system described above, these SLIC devices generate a balanced ring signal between Tip & Ring. The voltage on either line falls between the battery voltage and ground. Therefore, the SLIC protection device can have an operating voltage that is very close to the battery voltage. Since battery voltages may vary between talk and ringing states, it is desirable to utilize a program- mable protection device so that the voltage across the SLIC does not exceed the process limits and the stress on the device is minimized. Tip Ring Battery 0V Protecting SLIC with Integrated Ring Generator Applications Information |
Podobny numer części - TC04A-200 |
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Podobny opis - TC04A-200 |
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