Abbreviations - Orban OPTIMOD-FM 8500S Operating Manual

6-14
TECHNICAL DATA

Abbreviations

The power supply is a modular switching supply to minimize heat buildup and
power consumption. It converts an AC line voltage input to +15, –15, and +5 volts.
All other supply voltages are derived from these three voltages via local regulation.
The supply accepts inputs from 85 to 264 VAC, 50 – 60 Hz.
The only fuse in your Optimod is a 2.5A 20mm Quick Acting HBC fuse mounted on
the power supply's circuit board. Because the supply's outputs are automatically cur-
rent-limited, the fuse will usually open only if the power supply fails. Be sure to dis-
connect your Optimod from AC power before replacing the fuse!
Because of safety and EMI suppression requirements in the power supply, there are
no user-serviceable parts in it. In case of failure, replace the entire supply with an
Orban-supplied replacement (Orban part number 29270.000.01), which ensures that
your Optimod will continue to meet all regulatory requirements for safety and emis-
sions.
Some of the abbreviations used in this manual may not be familiar to all readers:
A/D (or A to D) analog-to-digital converter
AES Audio Engineering Society
AGC automatic gain control
A-I analog input
A-O analog output
BAL balanced (refers to an audio connection with two active conductors and one shield sur-
rounding them).
BBC British Broadcasting Corporation
BNC a type of RF connector
CALIB calibrate
CIT composite isolation transformer
CMOS complementary metal-oxide semiconductor
COFDM Coded Orthogonal Frequency Division Multiplex — a robust type of digital modulation using
many narrow-bandwidth, low data rate, mutually non-interfering carriers to achieve an ag-
gregate high data rate with excellent multipath rejection.
COM serial data communications port
D/A (or D to A) digital-to-analog converter
dBm decibel power measurement. 0 dBm = 1mW applied to a specified load. In audio, the load
is usually 600Ω. In this case only, 0 dBm = 0.775V rms.
dBu decibel voltage measurement. 0 dBu = 0.775V RMS. For this application, the dBm-into-
600Ω scale on voltmeters can be read as if it were calibrated in dBu.
DI digital input
DJ disk jockey, an announcer who plays records in a club or on the air
DO digital output
DOS Microsoft disk operating system for IBM-compatible PC
DSP digital signal processor (or processing). May also refer to a special type of microprocessor
optimized for efficiently executing arithmetic.
EBU European Broadcasting Union
EBS Emergency Broadcasting System (U.S.A.)
EMI electromagnetic interference
ESC escape
ORBAN MODEL 8500S