EXPRESS DAS
Installation and Operations Manual
EXPRESS DAS Installation and Operations Manual – Version 2.2 November 2013
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Appendix – Glossary of Terms
The following terms, acronyms and abbreviations appear in this manual :
Attenuation
(ATT) – Reducing signal strength during transmission.
Attenuation
is the opposite of
amplification.
Automatic Gain Control (AGC)
– AGC is widely used in communication systems to maintain constant
signal strength by varying the amplifier gain.
Band Pass Filter
(BPF) – A device that passes frequencies within a certain range and rejects (attenuates)
frequencies outside that range.
Base Station Interface Unit
(BIU) – The unit in the SOLiD DAS topology that receives, combines, and
filters all the signal sources, and then sends them to the ODU.
Coaxial Cable
– Cable used for transmitting high-frequency signals. The coaxial cables handle all
frequencies at one time from below 150MHz to over 3GHz. Also called: coax cable.
Distributed Antenna System (DAS) –
A network made up of several components that work together to
provide wireless service within a building or campus environment.
Donor Antenna –
An antenna mounted outside, usually on top of a building, designed to obtain the
maximum signal and coverage for a specific repeater system. Donor antennas can be a Yagi, Grid, or
Omni-Directional.
Frequency Shift Keying
(FSK) – A frequency modulation scheme in which digital information is
transmitted through discrete frequency changes of a carrier wave.
Hot Swappable –
A feature that allows one module to be removed while another module maintains all
other services.
MIMO –
Abbreviation for Multiple-Input and Multiple-Output. The use of multiple antennas to improve
communication performance.
Multi-Mode fiber –
A type of optical fiber commonly used for communication over short distances, such
as within a building or on a campus.
NFPA 72 Code –
A standard in the enforcement of fire code regulation published by the National Fire
Protection Association
.
Optical Distribution Unit (ODU) –
The ODU converts the RF signal to an optical signal and transmits it
via fiber to the MRU.
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