Objective
The SLIC (Subscriber Line Interface Circuit) provides all the BORSCHT functions such as battery, ringing and supervision between the codec and telephone handset. This PortNote® solution provides protection recommendations for SLIC interfaces against 4 kV 10/700 µs surge and power contact threats.

 

Solution
1 Thyristor: TISP9110MDMR-S
2 CPTC Resettable Fuses: CMF-RL55-10-0

 

Compliance
ITU-T Basic for K.20, K.21, K.45
• Increased surge withstand to 4 kV 10/700 µs

Alternate Recommendations
Other PortNote® Solutions:
• Negative Battery Voltage SLIC Protection - ITU-T Solution
• Negative Battery Voltage SLIC Protection -
 GR-1089-CORE Intra-building Solution
• SLIC Protection - GR-1089-CORE Intra-building Solution

Benefit
This solution provides a 4 kV 10/700 µs level of protection in
dual voltage ringing SLICs.

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