Harris Intraplex HD Link RF, Руководство по установке и эксплуатации, Страница: 175 / 181

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Harris Corporation 8-1
Intraplex Products
Section 8 – Glossary
This list of glossary terms comprises some acronyms and terms used in this manual. The list aids
those less versed in broadcast, networking, or telecommunications terminology and is not exhaustive.
Reference Description
ACO Alarm Cut Off device; the green light on front of a shelf indicates the alarm cut-off
is active.
Active In redundant HD Link system, the transmitter or receiver currently transmitting or
receiving signals.
AES/EBU Audio Engineering Society/European Broadcast Union; a known digital audio
standard designed and developed by science and technology experts to handle
signals from digital audio systems.
Alarms,
Major/Minor Major/minor alarm terminology in this manual relates to alarm/alert or
critical/warning alarm terminology for other products.
Apt-X;
Enhanced apt-X Proprietary audio codec compression algorithms developed by APT Licensing.
ASN Autonomous System Number; a unique identifier of an autonomous system on the
Internet.
BER Bit Error Rate; the ratio of error bits to the total number of transmitted bits. The
faster the speed of data transmission the more likelihood of error (in other words,
the more likelihood of bad packets in the stream).
CRC
Cyclic redundancy checking;
an error checking technique used to ensure the
accuracy of transmitting digital data; transmitted messages are divided
into predetermined lengths which, used as dividends, are divided by a
fixed divisor; the remainder of the calculation is appended onto and sent
with the message; at the receiving end, the computer recalculates the
remainder and, if it does not match the transmitted remainder, an error is
detected.
Datagram A unit of information in the Internet Protocol (IP) containing both data and
address information.
dB Decibel
DSL Digital subscriber line; technology that significantly increases the digital capacity
of ordinary telephone lines (the local loops) into the home or office; DSL speeds
are based on the distance between the customer and the telco central office.
EAS Emergency Alert System; federal warning system enabling the President to take
over airways to alert the public of major catastrophic events.
Failover In redundancy, if the current Active HD Link transmitter or receiver fails, the
Standby unit takes over.
FEC Forward error correction; a communications technique that can correct bad data
on the receiving end. Before transmission, the data are processed through an
algorithm that adds extra bits for error correction. If the transmitted message is
received in error, the correction bits are used to repair it.
G.722 Coding The ITU-T G.722 audio coding standard defines a method for encoding/decoding 7
kHz audio into 64 kbps. G.722 coding uses a form of sub-band adaptive
differential pulse code modulation (SB-ADPCM) audio compression.