DPS Telecom D-PG-413-11C-00, Руководство пользователя

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Glossary of Order-Wire and Alarm Remote Terms
ACO - Alarm cut off. Switch to silence an audible alarm.
When the ACO is “on,” the audible alarm device is silenced.
Alarm Point - A single discrete alarm input that requires a
discrete (usually on-to-off or off-to-on) change in current flow
or voltage to indicate a change of alarm condition from normal
to alarm state. Assigned to a point number in a display and ad-
dress. Usually reported to master as a single bit in a data stream.
Battery - Facility DC power. Normally supplied from a bat-
tery plant inside the office. Polarity is normally negative (posi-
tive ground) in a telecom facility.
Baud - The data transmission rate that the Com Port uses to
talk to the equipment. Common data rates include: 1200, 2400,
4800, 9600, 19200 (19) and 38400 (38).
Change Of State - This is the condition of a point when it is
in transition from one state to another. Change of State is abbre-
viated as COS.
Control Point - Relay isolated output that is controlled by
command from the master. Normally-open (SPST) dry contacts
are commonly used.
COS - This is the abbreviation for Change Of State.
Craft Port - Serial port for connection of a computer or
ASCII terminal to test and modify configuration of the remote.
Database - A file containing records of organized and re-
lated information.
Displays - Displays contain 64 points of data.
Download - The act of transferring a configuration file from
a computer to the KDA. Can be done remotely via the dial port
(modem), if equipped, or locally via the craft port.
DTMF - The abbreviation for Dual Tone Multi-Frequency.
This is a common touch tone telephone.
Expansion Card - Accessory card that fits into a slot at the
right side of the KDA chassis. Adds additional functions to the
host unit, such as the ADPCM and DVF-64 cards.
FDO - Model designation for DPS Telecom’s order-wire
product line. All products with this prefix are used with the or-
der-wire.
KDA - Model designation for DPS Telecom’s alarm remote /
network element product line. All products with this prefix are
alarm remotes.
LED - The abbreviation for Light Emitting Diode. The LED
is used as an indicator of activity.
Modem - The abbreviation for Modulator/Demodulator.
Modems are used to transfer data over telephone lines.
Off-net - A connection point in the order-wire network for
the public switched telephone network (PSTN). Allows or-
der-wire stations to have access for global communications.
Optically Isolated - Electrical interface, such as a discrete
alarm point input, that isolates the external circuitry from the
internal circuitry of the KDA with an optical coupler. Optical
Isolation reduces the possibility of electrical mis-match or in-
terference between the KDA and the alarm sources.
Order-Wire - Voice communications device for mainte-
nance personnel. Often includes data for alarms and network
management. Other terms are service channel and supervisory.
Polarity - The polarity of a point can be either Normal
(NRM) or Reverse (RVS). Normal polarity is current flow in a
closed circuit for an alarm.
POTS - Plain Old Telephone Service. A 2-wire phone line to
a central office switch.
RTU - Remote Telemetry Unit. An RTU is a device that
gathers alarm inputs and communicates them to a master alarm
station.
Satellite - Additional KDA units at the same location and
communicating with the master through a “base” KDA. Up to
three satellites can be associated with a base KDA. Using satel-
lites expands the use of a remote address, allowing greater sys-
tem capacity.
TBOS - Telemetry-Byte-Oriented-Serial protocol. A
well-established alarm system protocol used by many
telco-oriented manufacturers. Normally embedded in switches,
channel banks and other equipment with many alarm points.
TBOS normally uses an RS422 serial port. A port has a capac-
ity of 512 alarm points, divided into 8 “displays” of 64 points
each.
Traffic - Activity on the line or channel.
Wire-Wrap - Wire connection points using a steel post that
the connecting wire is wrapped around using a special tool.
UM118129 8 D-PG-423-11C-04
August 11, 1999