Wegener Communications 4422 - Manual (Page 63)

Page 63
Page 63 of 72 UTY4422-002
Appendix C
Glossary 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.