Specifications

xvi 888-2857-001 5/9/13
WARNING: Disconnect primary power prior to servicing.
Hierarchical modes:
A transmission technique whereby the transmitted data payload is divided into a
lower data rate high priority (HP) stream and a higher data rate low priority (LP)
stream. Those receivers with difficult reception conditions decode only the more
robust HP data stream, while receivers with good reception conditions receive both
data streams.
Hot-pluggable:
Term to denote that the device in question can be removed while transmitter is
operating without suffering damage or causing damage to other devices.
HTML (Hypertext Markup Language):
The predominant markup language for web pages. HTML is the basic building
block of web pages.
IP Address (Internet Protocol Address):
A numerical label assigned to each device (e.g., computer, printer) participating in a
computer network that uses the Internet Protocol (IP) for communication. An IP
address serves two principal functions: host or network interface identification and
location addressing.
LCD (Liquid Crystal Display):
A thin, flat electronic visual display that uses the light modulating properties of
liquid crystals to display text and images. In the VAX transmitter, the blue display
screen on the front panel of the low power unit(s).
LPF (Low Pass Filter):
A high power filter located at the transmitter output port used to attenuate out-of-
band emissions at the signal harmonic frequencies arising from the high power
amplification process. May also be referred to as a harmonic filter.
LPU (Low Power Unit):
May also be referred to as the exciter. The LPU contains both an upper, modulator
section and a lower, amplifier section.
MER (Modulation Error Ratio):
A measure used to quantify the performance of the quality the digital being
transmitted. A signal sent by an ideal transmitter would have all constellation points