P Device （ S series）
DO-214AA P solid state protection devices protect telecommunications equipment such as modems, line cards, fax machines, and other CPE.
P devices are used to enable equipment to meet various regulatory requirements including GR 1089, ITU K.20, K.21 and K.45, IEC 60950, UL 60950, and TIA-968 (formerly known as FCC Part 68).

APPLICATIONs
When protecting telecommunication circuits, P devices are connected across Tip and Ring for metallic protection and across Tip and Ground and Ring and Ground for longitudinal protection. They typically are placed behind some type of current-limiting device. Common applications include:
• Central office line cards (SLICs)
• T-1/E-1, ISDN, and xDSL transmission equipment
• Customer Premises Equipment (CPE) such as phones, modems, and caller ID adjunct boxes
• PBXs, KSUs, and other switches
• Primary protection including main distribution frames, five-pin modules, building entrance equipment, and station protection modules
• Data lines and security systems
• CATV line amplifiers and power inserters
• Sprinkler systems