Glossary
Numerics A B C D E F G H I J L M N O P
Q R S T U V W Y
© 2011 Harmonic Inc. 202 ProView 7000 v.2.4, Rev. A
DB-9
A 9-pin connector used to connect communications and other electronic devices. It is commonly
used for
TIA-232 and similar interfaces.
dBm
Power ratio in decibels (dB) of the measured power referenced to one milliwatt.
DBS
Direct Broadcast Satellite. Describes a video entertainment broadcasting system over satellite to
receivers at the customer (end user) home.
DCII
DigiCipher 2
DCE
Data Communications Equipment. A device that communicates with a DTE over TIA-232 . For
example, a modem is a DCE that sends to and accepts data from a host computer (DTE). See
also
DTE .
DD
Dolby Digital. See AC-3.
decoder
A device that converts an compressed signal back to baseband video and audio.
demultiplex
The conversion of several intermixed signals to l separate signals.
DHCP
Dynamic Host Configuration Protocol.
DHEI
Digital Headend Expansion Interface. An proprietary (Motorola) interface protocol for carrying
MPEG-2 transport streams between headend equipment.
DHOM
A card for the MN20 multiplex. The DHOM accepts DVB-ASI protocol input from the MOM
and translates it to DHEI output. The DHOM provides three DVB-ASI input ports and three
DHEI output ports.
differential transmission
The sending of the positive and negative aspects of a data signal so that it arrives undistorted. See
also
balanced audio .
DIM
A card for the MN20 multiplex. Accepts either formatted or unformatted data on an Ethernet
connection and packetizes this data for transmission in an MPEG-2
Transport Stream .
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