Installation guide

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Output signal Modulation Baudrate/BW Max bitrate (Mb/s) 85%
COFDM 64QAM 8 MHz 31,67 26,92
COFDM 64QAM 7 MHz 27,71 23,55
COFDM 64QAM 6 MHz 23,75 20,19
QAM 16QAM 6.875 Mbaud/s 25,34 21,54
QAM 32QAM 6,875 Mbaud/s 31,68 26,93
QAM 64QAM 6.875 Mbaud/s 38,01 32,31
QAM 128QAM 6.875 Mbaud/s 44,35 37,70
QAM 256QAM 6.875 Mbaud/s 50,69 43,08
5 About remultiplexing
Table 1. Max bit rates for COFDM and QAM.
The formula for calculating QAM output bitrate is: [ Baudrate x ”A”/(204/188) ]
where ”A” is 4 for 16QAM, 5 for 32QAM, 6 for 64QAM, 7 for 128QAM and 8 for
256QAM mode.
To be sure that you don’t exceed maximum bit rate for an output MUX, please
control that you don’t select to many services.
If you run a third party SNMP program you can monitor the Output bitrate and
see that the outgoing bitrate is not too high.
See Chapter 8 for more information about SNMP.
The table below gives max bit rates for COFDM and QAM out from ECX-200.
NOTE! Due to bit rate fluctuations from statistical multiplexing, we recommend
that you use maximum 85% of the theoretical available bit rate