Planet VC-204 Инструкция по эксплуатации онлайн [28/28] 65606

Q6: What is SNR and what’s the effect?

A6: In analog and digital communications, Signal-to-Noise

Ratio, often written SNR, is a measure of signal strength

relative to background noise. The ratio is usually measured

in decibels (dB).

In digital communications, the SNR will probably cause a

reduction in data speed because of frequent errors that

require the source (transmitting) computer or terminal to

resend some packets of data. SNR measures the quality of

a transmission channel over a network channel. The greater

the ratio, the easier it is to identify and subsequently isolate

and eliminate the source of noise.

Generally speaking, the higher SNR value gets better line

quality, but lower performance.

Q7: What is band plan and what’s the effect?

A7: VDSL2 denes multiple band plans and conguration modes

(proles) to allow asymmetric and symmetric services in

the same binder (by designated frequency bands) for the

transmission of upstream and downstream signals. User

has the ability to select xed band plan. When Symmetric

is selected that provides better downstream performance,

when Asymmetric is selected that provides better upstream

performance.