130 WEB Interface
CP560 DVB-T2 Gateway User’s Manual Rev. 2.2 (3686) ID: um_t2gateway
PLP fill
This parameter represents the average fill level of a given PLP, i.e. the percentage of FEC
block bits used for data compared to the total bits available for data. This value should
ideally be close to 100.0% to not waste capacity on air. To increase this value, either input
a Transport Stream with highter bitrate or change the PLP settings.
PLP bitrate
The actual bitrate for given the PLP based on the requested bitrate. The PLP bitrate will
always be greater than or equal to the requested bitrate, because the CP560 will allocate the
minimum number of whole FEC blocks to accomodate the requested bitrate. If only using
one PLP, the PLP bitrate will be maximized to use the whole capacity and will thus ignore
the requested bitrate parameter. To see the amount of FEC blocks, cells and subslices
allocated for each PLP, hover the mouse pointer over this field to get a tool tip as shown
in figure 8.72.
Figure 8.72 DVB-T2
PLP Allocations
At the bottom right of figure 8.71 there are some additional status parameters, as well as a
Allocate Max button.
Total rate
Displays the total rate usable for tranmission of TS packets on the output. This is the rate
used by the modulator when transmitting. The total input rate for all PLPs must be lower
than this value, or else packets will be dropped.
Used capacity
Displays the percentage of the total rate actually usable for data. Usually below 100%
because the number of data cells is not a whole number of cells per FEC block. By
hovering the mouse pointer over this parameter, you will get a detailed description of how
the cells of one T2-Frame has been allocated.
Allocate Max
Pressing the Allocate Max button will give the selected PLP the remaining T2-Frame ca-
pacity (if any). If running in Single PLP mode, the PLP will automatically be allocated the
full capacity of the T2 Frame.
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