电信专业英英词典P-1

（单词翻译:单击）

　　P-MAC

　　packet media access controller

　　PAD

　　packet assembler-disassembler

　　PCB

　　printed circuit board

　　PDS

　　premises¹ distribution system

　　Personal Communications

　　Personal communications provides at least one human operator with direct terminal access and real time or near real time interactive² communications with a remote human opera tor or an information system resource. Personal communications can refer to a broad range of services, systems and equipment, e.g., facsimile machines, landline telephones, cellular³ tele phone systems and emerging personal communication system (PCS) adjuncts, and a variety of radio systems including pagers, hand-held remote data entry terminals, and autonomous⁴ citizen-band- like radio systems.

　　PHY

　　physical-layer protocol⁵

　　PMD

　　physical-layer media-dependent

　　Point-of-presence (POP)

　　A POP is a physical location within a LATA that an IXC establishes for the purpose of gaining access to BOC/LEC networks within the LATA using LEC provided access services. An IXC may have more than one POP within a LATA and the POP may support public and private, switched and non switched services.

　　POP

　　point-of-presence

　　POT

　　point of termination