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Definitions

Common telephony terms used in this document.

PSTN Public Switched Telephone Network. Local telephone service providing a

direct circuit to the property from a central office. The T3 system cannot be

connected to the PSTN.

PBX Private Branch eXchange. A telephone system installed and maintained by

a property owner, such as a hotel operator. A PBX allows a large number of

users to share a limited number of external lines connected to the PSTN.

The T3 system will supply Line Power co-existent with an Analog PBX. If

using a Digital PBX, Line Power must be disabled.

POTS Plain Old Telephone Service. This term is used generically to describe

analog telephone service from a PBX or the PSTN.

Analog Analog telephone service uses a low frequency range from 180hz to 3.2khz.

Most PBX systems used in hotels use analog signaling for the in-building

phone service.

Digital Digital telephone service for extended services. Typically higher cost than

analog. ISDN is an example of a digital phone system.

Termination Block A physical device that terminates a bundle of wire so that individual pairs can

be routed to different destinations.

Blocks are identified by the type of termination. Common termination blocks

in North America are type 66 or 110. Common blocks in Europe include

Krone and Bix. These blocks all require a different tool and have a different

footprint, but are functionally equivalent.

Some blocks have multiple terminations; such as an RJ21 connector. This

allows the block to be used to interconnect different systems.

RJ21 A physical connector used for telephone equipment and 10BaseT

equipment. When used with telephone systems, the RJ21 50-pin connector

concentrates 25 phone lines in one connector.

Cross connect wire Cross connect wire is a single wire pair, used to connect between any two

terminating blocks.

Cross connect wire allows a technician to easily change lines, and to

troubleshoot possible in-building wire problems.

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