User's Manual

Page 65

NewStream User Guide and Technical Manual

Satelitte Status Page [Continued]

Modulation Status

The Modulation Status ﬁ elds present NewStream’s microwave settings for the selected

preset.

Modulation Mode

This ﬁ eld displays one of the following modulation classes for each microwave preset:

• COFDM-DVB-T — Coded Orthogonal Frequency - Division Multiplexing - Digital

Video Broadcasting — Terrestrial

• LMS-T — Link Modulation Scheme —Terrestrial

• DVB - S — Digital Video Broadcasting — Satellite Mode

• DVB - S2 — Digital Video Broadcasting —Satellite Mode

Modulation

This ﬁ eld displays the following modulation classes for each microwave preset in the

Microwave Settings page. Moving up the scale of modulations allows higher throughput

but at the cost of robustness:

• QPSK — Quadrature phase-shift keying

• 16-QAM — Quadrature amplitude modulation

• APSK — Amplitude Phase-shift Keying [for both 16 and 32-APSK]

• 64 - QAM — Quadrature amplitude modulation

FEC

Forward Error Correction [FEC] or channel coding is a technique used for controlling

errors in data transmission over unreliable or noisy communication channels. This ﬁ eld

displays the FEC for the existing microwave preset. Lower fractions are more robust

to noise and fading but at the cost of reduced information bandwidth. Common FEC

values include:

• 1/4

• 1/2

• 1/3

• 2/3

• 3/4

• 5/6

• 7/8

Spectrum

The Spectrum ﬁ eld displays either Normal or Inverted.