T
T1
AT&T term for a digital carrier facility used to transmit a DS-1 formatted digital signal at 1.544 Mbps.
Tamper
A contact switch placed inside a panel or device enclosure to initiate an alarm when the enclosure is opened.
Tamper Proof
Boxes containing alarm instruments, detectors, bells, sirens, etc. that have spring-loaded tamper switches inside or on the back. These switches set the alarm off if the box is opened or removed from the wall.
Tamper Switch
A switch used to limit access to electronic or other crucial areas of alarm equipment or circuitry. This is used to detect unauthorized opening or removal.
Transmission Control Protocol/Internet Protocol (TCP/IP)
The suite of communications protocols used to connect hosts on the Internet. TCP/IP uses several protocols, and the two main ones are TCP and IP.
TCP/IP is built into the UNIX operating system and is used by the Internet, making it the de facto standard for transmitting data over networks. Network operating systems that have their own protocols, such as Netware, also support TCP/IP.
Telco
An alternate term used for a telephone company.
Temporal Code 3
A repeating 0.5 second on, 0.5 second off alarm (three times) followed by 2.5 seconds off.
Temporal Code 4
The audible carbon monoxide alarm signal with a four-pulse temporal pattern that complies with the following information:
Signals shall be a pattern consisting of four cycles of 100 milliseconds +/- 10% “on” and 100 milliseconds +/- 10% “off” followed by 5 seconds +/- 10% “off.”
After the initial 4 minutes of alarm, the 5-second “off” time shall be permitted to be changed to 60 seconds +/- 10 percent.
The alarm signal shall be repeated in compliance with 5.8.6.5.1(1) and 5.8.6.5.1(2) until the alarm resets or the alarm signal is manually silenced.
Source: NFPA 720 Standard for the Installation of Carbon Monoxide (CO) Detection and Warning Equipment 2015 Edition.
Temporary Schedules
A programmable schedule found in DMP panels that allows the user to give restricted, short-term access to another person. Temporary schedules can be used to create a window outside of normal business hours when a maintenance or delivery person can enter using a special code that functions only during this window. When that schedule has completed its tasks, the panel then removes it.
Terminal Strip
A line of or row of screw-in points on a panel or expander module for general input and output from or to the device.
Tests
Checks performed on a monitoring center alarm system by activating the system. Personnel from the alarm company can check for irregularities in the system.
Test Frequency
A programming option that allows the user to set how often the panel’s Test Report is sent to the monitoring center receiver. The frequency range is from 1 to 60 days in 1-day increments.
Test Report
Test Time
The time of day the panel sends the Test Report to the receiver.
Thermal Detectors
Devices that have a thermostat to detect fires. When temperatures near the detector reach a set temperature, the alarm activates.
Thermal Lag
The time it takes for the operating element of a heat detector to absorb heat from the surrounding air. When a fixed temperature device operates, the temperature of the surrounding air is always higher than the operating temperature of the device itself.
Thickwire
A type of Ethernet cabling, also known as 10Base-5, that uses a thick (about 3/8”) coaxial cable. This is primarily used as a backbone where thinwire or twisted pair hubs are connected.
Time-Delay Relay
A relay for automatically locking or unlocking a locking unit after a short, fixed time interval.
Time-out
An interrupt signal generated by a program or device that has waited a certain length of time for some input but has not received it. Many programs perform time-outs so that the program does not sit idle waiting for input that may never come.
Touchscreen
A keypad display that allows users to touch portions of the screen to complete an operation rather than pressing top row Select Key(s).
Transceiver
A single-ended electrical installation consisting of both transmitter and receiver. It transmits a beam that is then reflected back to the receiver in the same unit.
Transformer
An electrical component or device that, by electromagnetic induction, transforms an AC voltage to a higher or lower AC value. It also provides isolation between two AC circuits.
Transient
Any increase or decrease in the excursion of voltage, current, power, heat, etc. above or below a nominal value that is not normal to the source.
Transmit Delay
A feature of DMP Command Processor panels that delays sending burglary alarm reports to the receiver for a selectable length of time up to 60 seconds. DMP panels use this feature to help reduce false alarms.
Transmitter
In a fire or security system, a device that sends alarm signals from a protected premises to a proprietary headquarters, a monitoring center, or a municipal headquarters. Transmitters can be hardwired or wireless.
Transmission Control Protocol (TCP)
One of the main protocols in TCP/IP networks. While IP (Internet Protocol) only deals with packets, TCP enables two hosts to establish a connection and exchange data streams. TCP guarantees data delivery and also guarantees that packets are delivered in the same order they were sent.
Trip
The faulting of a device on a zone during an armed state. A panel in an alarmed state is also often referred to as having been tripped.
Trouble
An off normal condition on a zone during a supervised state. A normally closed zone that alarms when opened can initiate a trouble when shorted. A fire zone that alarms when shorted can initiate a trouble when opened.
Trouble Signal
A signal that indicates trouble of any kind. This can be a circuit break or a ground occurring in an alarm system, devices, or wiring. DMP panels use this feature to help reduce false alarms.
Two-Button Panic
A panic device that requires the user to depress both buttons at the same time to send a panic signal.
Two-Wire Smoke Detector
A smoke detector that initiates an alarm condition on the same two wires that also supply power to the detector.