Glossary - Harmonic NSG 9116 Hardware Installation

A
ASI
asynchronous serial interface. A DVB-
defined interface protocol for carrying
MPEG-2 transport streams at a constant or
defined transmission rate.
B
bandwidth
The maximum amount of data that a
transmission device (cable, fiber-optics link,
satellite feed, and so on) is capable of
carrying.
bandwidth allocation
The process of assigning portions of the
total bandwidth on the basis of the
requirements of the program material. A
channel that requires a high-quality picture,
for example, a live sports broadcast, should
be allocated a high bandwidth. A channel
that can be transmitted with a lower-quality
picture, for example, a VCR-quality movie,
should be assigned a lower bandwidth.
C
cascading
The concept that NSGs maybe chained
together is to optimize the bandwidth
utilization of one GbE.
CMTS
Works as an arbitrator for IP
communications over RF networks.
See also INA.
component
A Harmonic hardware product that is a
single, self-contained part of the network.
D
data stream
The continuous flow of information from one
location to another.
DCE
data communications equipment. A device
that communicates with a DTE over
EIA-232. For example, a modem is a DCE
that sends to and accepts data from a host
computer (DTE). See also DTE.
downstream
The direction of the communications service
data flow. Broadcast services flow
downstream from the service provider to the
subscriber.
DTE
data terminal equipment. A device that
communicates with a DCE device over
EIA-232. For example, a DTE is a computer
that sends to and accepts data from a
modem (DCE). See also DCE.

Glossary