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Glossary

A B C D E F G H I J K L M N O P Q R S T U V W X Y

PON - See passive optical network.

POP - See point of presence.

Postal, Telegraph and Telephone (PTT) - The generic European name usually used to refer to state-owned telephone companies.

POTS - See plain old telephone service.

POTS splitter - A device that uses filters to separate voice from data signals when they are to be carried on the same phone line, required for several types of DSL service.

PRI-ISDN - See primary-rate ISDN.

PTT - See Postal, Telegraph and Telephone. public switched telephone network (PSTN) The worldwide communications network that carries phone calls and data.