Sur-Gard System Five

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Appendix E: Glossary

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POTS

Plain Old Telephone System. An acronym used to describe a standard analog telephone network, or alternatively a standard analog telephone line.

Printer Message

The alarm information delivered by a receiver to a central station printer. This information is generally encapsulated in a descriptive English text mes-

sage.

Profile

Generally refers to a group of options. The receiver can select a "profile" based on certain conditions.

Protocol

The pre-established order of events and meanings of the various characters in the information transmitted from a receiver to a monitoring computer.

PSTN

Public Switched Telephone Network. Analogous to POTS.

Receiver

The equipment used to receive alarms sent from panels. Sur-Gard's receivers are the SLR and the MLR. 'Receiver' is sometimes used interchangeably

with 'line card' as it is the line card which actually receives the alarm in the MLR.

Ring

One of the wires used on a phone line. By convention this is red.

Rounds

Two or more packets of alarm information used for error checking. If two packets (rounds) are identical the packet contains valid data.

RRLLL

The part of the automation message which stores the receiver number and line card number. The length of this field is variable and is controlled via an

option in both the line card and the SG-CPM5.

RS-232

An asynchronous, point-to-point serial communications protocol. Used to communicate between the SG-CPM5 and the automation computer.

Server

One side of a 2-sided TCP socket connection. The server is the one responsible for receiving the socket connection with the remote host (the client). In

general, a host which acts as a server can receive multiple client socket connection requests simultaneously. The SG-CPM5 acts as a server to both the

console and the web interface.

SG-CPM5