
15-2
Latency
Time interval from when audio is sent from a device until it is received by another device.
LCD
Liquid Crystal Display.
LED
Light Emitting Diode.
License Free
Device uses frequency bands that do not require the user to obtain an approval for use. Specifically, the
2.4GHz ISM frequency band for 802.11 WLAN.
LOS
Line-of-Sight. When the transmitters and receivers of wireless devices have a clear “sight” to each other
by having no obstructions in-between them. RF signals can travel in a straight line between those
devices.
MAC address
Media Access Control address. Unique identifier for a particular physical device on a network.
Master Wireless
Mode
The TR-240’s radio is active and the Ethernet port is deactivated. A “master” TR-240 serves as an access
point and provides wireless coverage for communication between itself and other TR-240’s in wireless
mode.
Momentary
The microphone path of the device is temporarily enabled/disabled. Enabled while the button is pressed
and disabled when the button is released.
Multicast
Delivery of a network information packet to a group of destination devices simultaneously in a single
transmission.
Network (line) echo
The result from connecting a digital intercom system with latency to an external 2-wire intercom system
without sufficient “nulling” capabilities and/or echo cancellation.
Omni-directional
Pertaining to antennas where the power is radiated uniformly in all directions.
Push-to-latch
The microphone path will enable and remain enabled when the button is pressed quickly. The microphone
path will be disabled when the button is pressed again.
Push-to-transmit
(Push-to-TX), see “Momentary”.
RF channel
Radio Frequency channel. Set of frequencies in which the device transmits and receives.
Sidetone
The amount of a user’s own voice that is fed back in the local headset.
SSID Service Set Identifier. A phrase used to identify a particular wireless network.
Squelch Level A specified level of audio that must be met, or exceeded, in order for that audio to be transmitted.
WEP
Wired Equivalent Privacy. An encryption algorithm for security on wireless networks.
Wi-Fi
A wireless product that is based on the IEEE 802.11 standards.
Wired Mode
The TR-240’s Ethernet port is active and the radio is deactivated. TR-240’s in wired mode can
communicate to other TR-240’s in wired mode without a BTR-240 base station.
Wireless Mode
The TR-240’s radio is active and the Ethernet port is deactivated. A BTR-240 base station serves as the
access point and provides wireless coverage for communication between the TR-240’s.
WLAN
Wireless Local Area Network. Defined by the 802.11 protocol.
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