H

Half Duplex

A multiplex system that can transmit in both directions but not at the same time.

Handshake

A process where predetermined character arrangements are exchanged by the receiving and transmitting equipment to establish synchronization.

Hardware Address

The unique physical address determined at the physical and data link layers. For example, each Ethernet card has a unique hardware address that is stored within the card.

Hardwired

Devices that are connected with wire.

Harness

A bundle of wires with a connector for interconnecting field wiring to alarm modules.

Heat Detector

A device that detects the presence of highly heated air due to a fire. A fixed temperature heat detector is used to detect the fast buildup of heat due to the flame or flash of a fire. A rate-of-rise heat detector is used to detect the slow buildup of heat due to a smoldering fire.

Hertz (Hz)

A unit of frequency equal to one cycle per second.

High-Speed Packet Access (Evolved) or (HSPA+)

A technical standard for wireless, broadband telecommunication. HSPA+ enhances the widely used WCDMA based 3G networks with higher speeds for the end user that are comparable to the newer LTE networks.

HSPA+ was first defined in the technical standard 3GPP release 7 and expanded further in later releases. HSPA+ provides an evolution of High Speed Packet Access and provides data rates up to 168 Megabits per second (Mbit/s) to the mobile device and 22 Mbit/s from the mobile device.

Holdup Alarm

An alarm initiated by a mechanical panic button or software panic on a keypad in response to a robbery or assault. This is also referred to as panic alarms. On-site horns and bells should not be programmed to sound when a holdup alarm initiates.

Home

A condition of the system where perimeter devices are only placed into an armed state, allowing the user to move freely about the inside.

Home/Sleep/Away

A system option that provides users with perimeter, interior, and bedroom areas that they can selectively arm from the keypad for maximum security. Selecting Away arms all areas of the system, selecting Home arms only the perimeter protection of the system, and selecting Sleep arms the perimeter and interior areas but leaves devices near bedrooms and other nighttime areas off.

Homerun

A wiring method that connects individual sensors directly to the control panel using a single wire.

Hop

A unit of distance that measures the passage of a datagram through a router. The distance between networks is often measured by the number of hops. DMP Two-Way Wireless technology uses spread spectrum technology enabling the system to use any of numerous channels within the 905-924 MHz band and to dynamically hop every 32 milliseconds across 53 frequencies.

With non-spread spectrum systems that operate in a narrow frequency band, an intruder can use a wireless device to flood the area with transmissions at the same frequency used by the alarm system, thereby preventing alarm signals from reaching the receiver. By using spread spectrum technology, this ensures that a DMP wireless system cannot be defeated by jamming. It also provides reliable operation, even in harsh communication environments or longer-range communications.

Hop Count

The number of routers that a datagram travels through on the way to its destination. The user can adjust hop counts to provide routing flexibility.

Horn, Motor Driven

An electrically operated horn where the action of a motor-driven actuator against a metal diaphragm produces a signal.

Host (HST)

See NET.

Host Check-In

See Network Check-In.

Host Log

Data report that includes information such as the type of activity, time, date of the activity, and the user name and number.

House Code

A code used to identify the panel, wireless receiver and transmitter(s) to each other.