Product applications for coordinated protection in the telecom industry fall into two categories. Infrastructure equipment, such as main distribution frames, DSL splitters, and analog voice linecards, DSLAMs, and customer premise equipment, including phones, faxes, set-top boxes, analog modems, security systems, DSL gateway modems, and mobile phone base stations. Each category is regulated by its own set of specifications, requiring different circuit protection scenarios, depending on what the customer’s needs are.