Terms used as applied to Data (and some Voice) Transmission over Copper Wire

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Packet Switching
PIC Code
POTS (LifeLine)










Packet Switching -The method used to move data around on the LANs, WANS and the Internet. In packet switching, all the data coming out of a machine is broken up into chunks, each chunk has the address of where it came from and where it is going. This enables chunks of data from many different sources to co-mingle on the same lines, and be sorted and directed to different routes by special machines, i.e. ROUTERS, along the way. This way many people can use the same lines at the same time.

PairGain -- The result of combining (multiplexing) n number of telephone channels into a single (or multiple) pair(s) wires. Example: Mathematically, Pair Gain equals the total number of voice/data channels, divided by the number of wire pairs used. Therefore, 4 channels (voice or data), over a single pair of wires, results into a "PairGain" of "4"

PIC Code-- Acronym for "Primary IntraLata Carrier" code. A coded number automatically attached to every number you dial. This code informs your carrier to which carrier to route and bill for that telephone number. The well known 1010-xyz numbers are a PIC Code. See further information on this web site.

PID (Product ID) -- Product ordering number assigned and used in PacBell. Number is assigned after the product has been approved for purchase. Different than CLEI which is a BELCORE number.

POP (Point Of Presence) - Usually means a city or location where a network can be connected, often with dialup phone lines. An Internet company's POP is the point you call into, or connect to, for connection to that company's services. See Also: SLIP , PPP

Port-Generally, a place where information goes into or out of a computer or devices of some sort. E.g. the RS-232 serial port on a personal computer is where a modem would be connected.

POTS -- (Plain Old Telephone Service) -- Popular term describing the standard telephone company service in your home or office of which you are familiar.

POTS-Lifeline (Plain Old Telephone Service with Lifeline) -"Lifeline" POTS is a basic telephone service designed to ensure operation (especially voice) in case of an emergency, particularly during an electrical power outage. POTS lines are powered from the CO and do not require external power at the customer premises, so therefore they are categorized as a "Lifeline".

PPP (Point to Point Protocol) -- Well known as a protocol that allows a computer to use a regular telephone line and a modem to make TCP/IP connections for connection to the Internet. See Internet , SLIP , TCP/IP

PRI (Primary Rate Interface) -- Used in referring to ISDN channels on a T1...Same as T1(on the physical layer), combines 24ea 64K channels into a single pair of copper. See: BRI, B-Channel, D-Channel


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