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CPE is defined as any telephone terminal equipment which resides at the customer's site and is connected to the Public Switched Telephone Network (PSTN). Telephones, modems, caller ID adjunct boxes, PBXs, and answering machines are all considered CPE. CPE should be protected against overvoltages...

Nature of lightning strike damage: “…many types of electronic circuits can be damaged or. destroyed when exposed to an excess current or an excess voltage produced by that current. If lightning strikes on or near overhead electric power or telephone line, a large current will be. injected...

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