DekTec DTC-300 StreamXpress - Manual (Page 58)

DTC-300-SP – StreamXpress
USER MANUAL
58
3.5.14 QAM B modulation settings
The user can select the QAM-B modulation and change its parameters. Every UHF/VHF DekTec
modulator is licensed to support QAM-B by default. QAM-B is the North American standard used for
digital cable. QAM-B refers to J.83 Annex B standard.
QAM-B modulated channel utilize 6MHz bandwidth.
Variable Type Description Details Diag
Modulation
Mode
Drop
down
Select the modulation mode #1 1
Variable
interleaver
Drop
down
Select variable interleaver settings #2 2
#1 Modulation Mode:
The StreamXpress supports 2 modulation modes for QAM B: QAM 64 and QAM 256.
#2 Variable Interleaver:
QAM-B support variable interleaver to help protect burst of errors.
The CW represents the 4 bit control word. The I represent the number of taps of the interleaver and
the J represent the increment. The StreamXpress supports all 13 modes defined in the specification.
3.5.15 QAM C modulation settings
The user can select the QAM-C modulation and change its parameters. Every UHF/VHF DekTec
modulator is licensed to support QAM-C by default. QAM-C is the Japanese and some other Asian
countries standard used for digital cable. QAM-C refers to J.83 Annex C standard. QAM-C
modulated channel utilize 6MHz bandwidth.
1
2