Sur-Gard SG-System III, Operating Manual

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Appendix H - GLOSSARY
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SG-System I Operating Manual
H
Account The portion of a signal which contains the information identifying the location or the owner of the alarm panel.
Also referred to as account number, account code or account digits.
Acknowledgement
(ACK) A signal sent from the receiver to the panel indicating that data has been received. A positive acknowledge-
ment (ACK) means data was received without any detected errors. (see kiss-off). A negative acknowledge-
ment (NAK) means data was received, but there were detected errors. An acknowledgement may be sent per
packet or per alarm.
AHS Automatic Handshake Selection . Refers to the receiver feature which enables the line card to request the
handshake to be used with a particular panel from the CPM. The CPM maintains a database of most recently
used handshakes for all accounts connected to the receiver. Handshakes are stored along with the phone num-
ber of the associated alarm panel.
Alarm A message transmitted from the panel to the receiver containing account, event, zone, user or other informa-
tion. There may be one or more per call. An alarm may be repeated in the same call (if not successfully deliv-
ered in a previous attempt). An alarm will contain one or more packets. Packets can contain rounds or different
information. Alarm transmission is initiated with a handshake and, if received correctly, acknowledged with a
kiss-off.
ANI Automatic Number Identification .
ASCII America Standard Code for Informational Interchange . A seven-bit alphanumeric code used extensively
in data communications. Parity is often added to the seven-bit code for error detection.
Automation The combination of software package and PC which connects to the receiver to receive alarm events. The
automation can be connected either by direct serial connection or TCP.
Automation
Message The alarm information delivered by a receiver in a specified protocol to a central station computer or network.
Also referred to as a computer message
Backplane See SG-BP3X.
Block A group of data that specifically makes up one of the elements of an alarm. For example: account block, event
block, or alarm block. One packet could contain multiple blocks.
Busy Out A state of a line card. Under predefined criteria the line card will go off-hook so as to not process any new
alarms.
Call The process of a receiver going off-hook, receiving one or more alarms and returning on-hook.
Caller ID An FSK format received by the line card. This format can be received prior to sending the handshakes. The
Caller ID data can be used by the receiver to provide additional information to all alarms received during a
call.
Capture The ability of a receiver to store commands sent to the panel from the automation computer after all of the
alarms have been sent from the panel to the receiver.
Centronics A parallel printer interface standard. Also known as standard IEEE1284. A centronics interface is imple-
mented on the SG-CPM3 (through the backplane) to interface to the local parallel printer.
Checksum Additional data added to an alarm indicating whether the contents have been received correctly. This is gener-
ally done by summing all the digits in the message (mod 256) and reporting this as the checksum. Different
methods of calculating a checksum may be specified in particular formats or protocols.
C.L.A.S.S. Custom Local Area Signaling Services . This term is used in the telephone industry to represent all features
of a telephone line, such as Caller -ID, Call Forwarding, 3-Way Calling etc.