ADC Cuda 12000 Informazioni Techniche Scaricare il pdf (Pagina 638)

100

101

ADC Telecommunications, Inc.

634 A

PPENDIX A: GLOSSARY

Head-End The central location on the cable network that originates the broadcast video

and other signals in the downstream direction. See also Master Head-end,

Distribution Hub.

Header Protocol control information located at the beginning of a protocol data

unit.

HF See High Frequency.

HFC See Hybrid Fiber/Coaxial.

High Frequency

(HF)

The entire subsplit (5-30 MHz) and extended subsplit (5-42 MHz) band used

in reverse channel communications over the cable television network.

High Return A frequency division scheme that allows bi-directional traffic on a single

coaxial cable. Reverse channel signals propagate to the head-end above the

downstream passband.

HRC See Harmonic Related Carrier.

Hum Modulation Undesired modulation of the television visual carrier by the fundamental or

low-order harmonics of the power supply frequency, or other low-frequency

disturbances.

Hybrid

Fiber/Coaxial

(HFC) System

A broadband bidirectional shared-media transmission system using fiber

trunks between the head-end and the fiber nodes, and coaxial distribution

from the fiber nodes to the customer locations.

Hybrid

Fiber/Coaxial

(HFC) Network

A network where the trunk of the cable plant is fiber technology. The fiber is

connected to a coaxial cable and the signal is converted so that it is

compatible to that media. The coaxial cable runs through the branches of

the network and is dropped into the subscriber’s home.

ICMP See Internet Control Message Protocol.

IEEE See Institute of Electrical and Electronic Engineers.

IETF See Internet Engineering Task Force.

IGMP See Internet Group Management Protocol.

Impulse Noise Noise characterized by non-overlapping transient disturbances.

1 2 ... 633 634 635 636 637 638 639 640 641 642 643 ... 651 652

ADC Cuda 12000 Informazioni Techniche Pagina 638

Commenti su questo manuale

ADC Cuda 12000 Informazioni Techniche Pagina 638

Commenti su questo manuale

Prodotti e manuali riguardandi Switch di rete ADC Cuda 12000