电信专业英英词典P

1、电信专业英英词典PP-MACpacket media access controllerPADpacket assembler-disassemblerPCBprinted circuit boardPDSpremises distribution systemPersonal CommunicationsPersonal communications provides at least one human operator with directterminal access and real time or near real time interactive communications

2、 with aremote human opera tor or an information system resource. Personal communicationscan refer to a broad range of services, systems and equipment, e.g., facsimilemachines, landline telephones, cellular tele phone systems and emerging personalcommunication system (PCS) adjuncts, and a variety of

3、radio systems including pagers, hand-held remote data entry terminals, and autonomous citizen-band- like radiosystems.PHYphysical-layer protocolPMDphysical-layer media-dependentPoint-of-presence (POP)A POP is a physical location within a LATA that an IXC establishes for thepurpose of gaining access

4、to BOC/LEC networks within the LATA using LEC providedaccess services. An IXC may have more than one POPwithin a LATA and the POPmay support public and private, switched and non switched services.POP point-of-presencePOTpoint of terminationPPSNpublic packet switched networkPremises Distribution Syst

5、em (PDS)PDS is the transmission network inside a building or among a group of buildings, for example an office park or a campus. PDSis used in this book as a generic term although AT&T used it to describe a specific product offering. The PDSconnects desktop and other station equipment with commo

6、n host equipment, (e.g., switches, computers and building automation systems), and to external telecommunications networks.Private Branch Exchange (PBX)A PBX is a premises switching system, serving a commercial or government organization, and usually located on that organization's premises. PBXs

7、 provide telecommunications services on the premises or campus, (e.g., internal calling and other services), and access to public and private telecommunications network services.Private NetworkA private network is a network made up of circuits and, sometimes, switching equipment, for the exclusive u

8、se of one organization.PRIprimary rate interfaceProtocolsProtocols are strict procedures for the initiation, maintenance and termination of data communications. Protocols define the syntax (arrangements, formats and patterns of bits and bytes) and the semantics (system control, information context o

9、r meaning of patterns of bits or bytes) of exchanged data, as well as numerous other characteristics (data rates, timing, etc.).PSNpacket switched networkPSPDNpacket switched public data networkPSTNpublic switched telecommunications networkPTTpostal, telephone, and telegraphPublic Switched Telephone

10、 Network (PSTN)A Public Switched Telephone Network (PSTN) denotes those portions of the LEC and IXC networks that provide public switched telephone network services.PUCpublic utility commissionPulse Code Modulation (PCM)Pulse Code Modulation (PCM) is a modulation scheme involving conversion of a sig

11、nal from analog to digital form by means of coding. See also modulation.PVCpermanent virtual circuitPartner * s Program - Anindirect sales channel that offers smaller businesses in the TDS Telecom service areas an opportunity to promote and sell TDS Telecom products and services.Password - A code or

12、 word used to gain access to restricted data on a computer network. While passwords provide security against unauthorizedusers, the securitysystem can only confirm that the password is legitimate, not whether the user is authorized to use the password. That's why it is important to safeguard pas

13、swords by:* Never disclosing your password to anyone.* Creating a password that consists of letters, numbers, and symbols.* Changing your password frequently.PCS (Personal Communications Services)Originallymeant to describedigital service offered at a higher frequency (1900 MHz) than wireless, it is

14、 now used as a generic term for all digital (versus analog) wireless.PDF - An acronym for Portable Document Format, PDF is a file type created by Adobe Systems, Inc. that allows fully formatted, high-resolution documents to be easily transmitted across the Internet and viewed on any computer that ha

15、s Adobe Acrobat Reader software.Peering - The arrangement of information sharing between Internet Service Providers at various NAPs.PIC Freeze - Pre-subscribed Interexchange Carrier Freeze. An agreementbetween a customer and their local telephone company to prevent X slamming § on their long di

16、stance telephone bill.Pipeline - An extremely high-speed, large capacity bandwidth connection.Point of Presence (POP) - A location where a you can connect to a network through local telephone lines.Point-to-Point Protocol - A program that allows a computer to use a telephone line and modem to make T

17、CP/IP connections.PON (Passive Optical Network) - a fiber-based network built without activeelectronics.Because a PONnetwork uses optical splittersrather than costly activeelectronics,it is less expensive to build and maintain than a network that uses activeelectronics. PONsare still more expensive than copper-based networks. A PONnetwork is usually used in a local loop to connect customers to the central office. BPON (Broadband Passive Optical Network) is a broadband PON.POP