User's Manual

TB9300 Installation and Operation Manual Glossary 119

feature set A function or mode of operation of the base station which can be enabled

or disabled using the web interface. Each feature set requires a license to

be purchased from Tait before it can be enabled.

feature license key The unique set of digits belonging to a license which is programmed into

the base station to enable a feature set.

fill-in receiver An additional receiver placed within the coverage area of a base station to

receive MS transmissions that are too weak to be received by that base

station.

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.

front panel The cover over the front of the base station containing the indicator LEDs,

four-line LCD display, user controls and cooling fans.

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.