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Appendix CGlossary of Terms
AMBER – A “yellow” LED, usually denoting caution or a minor problem.
ASI – Asynchronous Serial Interface. A standard for carrying MPEG-2 transport streams at a
specific transmission rate.
ASIC – Application-Specific Integrated Circuit:
BLINK – An LED which is ON for 250 mS and OFF for 250 mS, with the pattern continuing
for some time, is said to “Blink.” See Table 11 (Page 30). Also, see “FLASH” and “Flutter.”
COMPEL™ – Wegener's patented satellite network control system. This is a system which
features a control data stream embedded along with the payload services, where a single central
control site may control all aspects of network operation: database management, program
selection and setup by site, grouping of sites, scheduling, etc.
COMPEL-CA™ – Wegener’s satellite network encryption system.
DAC – Digital-to-Analog Converter. A device that converts a sequence of numbers representing
signal amplitudes in electronic binary format to actual analog signals.
EEPROM – Electrically-Erasable Programmable Read-Only Memory. This acronym is used to
describe any non-volatile memory device that can be read- or written-to a nearly unlimited
number of times, but which retains its last written data when power is turned off.
FLASH – An LED which is ON for 100 mS and OFF for 100 mS, with the pattern continuing
for some time, is said to “Flash.” See Table 11 (Page 30). Also, see “BLINK” and “Flutter.”
FLUTTER – An LED that is ON for 50 mS and OFF for 50 mS, with the pattern continuing for
some time, is said to “Flutter.” See Table 11 (Page 30). Also, see “BLINK” and “FLASH.”
MCPC – Multiple-Channel-Per-Carrier. Means that one or more services or programs are
present on a particular radio-frequency carrier.
NVRAM – Non-Volatile Random-Access Memory – Random Access Memory which does not
‘lose’ its contents when power is off.
NTSC – National Television Standards Committee. This is a shorthand description for the
standard 525-line, 30-frames-per-second analog baseband television signal format used in the
US. and several other countries.