Tait TB7300, Инструкция по установке и эксплуатации

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78 Glossary TB7300 Installation and Operation Manual
© Tait Limited November 2016
feature license key
The unique set of digits belonging to a license which is programmed into
the base station to enable a feature set.
FLASH
Electrically block-erasable and programmable read-only memory.
FM
Frequency Modulation. Often used as an adjective to denote analog radio
transmission.
frequency band
The range of frequencies that the equipment is capable of operating on.
gating
The process of opening and closing the receiver gate. When a valid signal
is received, the receiver gate opens, letting the signal through.
group call
A call that is sent to more than one MS simultaneously.
heartbeat message
A message whose purpose is to indicate to the receiver that the sender is
operational.
hiccup mode
Many power supplies switch off in the event of a short-circuit and try to
start again after a short time (usually after a few seconds). This “hiccup”-
type of switching off and on is repeated until the problem is eliminated.
hostname
The unique name by which a network element is known on the network.
hub
A unit for connecting hosts together. It sends all incoming Ethernet packets
to all the other hosts.
hysteresis
The difference between the upper and lower trigger points. For example,
the receiver unmutes when the upper trigger point is reached, but will mute
again until the level falls to the lower trigger point. An adequate hysteresis
prevents the receiver gate from repeatedly muting and unmuting when the
level varies around the trigger point.
inbound
Describes the direction of a signal: from an MS over the air interface to the
fixed station.
IP
Internet Protocol is a protocol for sending data packets between hosts.
isolator
A passive two-port device which transmits power in one direction, and
absorbs power in the other direction. It is used with a PA to prevent damage
to the RF circuitry from high reverse power.
kernel
The core executable of an operating system.