Cable TV Measurements (Option K20) R&S FSL
1300.2519.12 2.84 E-11
channels are marked as < unused >. However, it is not possible to do measurements without any
p
recise information about the services. Therefore the Cable TV Measurements option introduces the
concept of the so–called modulation standard.
Modulation standards describe the signal characteristics, or physical layer, transmitted via a channel.
T
he Cable TV Measurements option supports modulation standards that characterize analog TV signals
(e.g. NTSC, SECAM, PAL) or digital TV signals (single carrier QAM as for example in DVB–C). Every
channel table can comprise several modulation standards. Once defined, every channel can reference
one of these modulation standards. Provided that at least one channel references a modulation
standard, measurements based on a channel table can easily be done.
You can create numerous channel tables (e.g. for different locations in the network / different
measurement tasks) and save them on the R&S FSL. But there can always be only one channel table
active at a time. Working without a channel table is realized by activating the special, pseudo channel
table called < none >.
Normally, the easiest way is not to create a channel table from the scratch, but to load pre–defined
channel tables delivered with the Cable TV Measurements option. They already hold the typical
frequency plans for many countries. You only have to fill in the modulation standards.
For detailed information on channel tables refer to section Channel tables, for modulation standards
refer to section Modulation standards. A detailed example is provided in section Example: Creating a
channel table. Fig. 2-60 gives an example of a channel table that references the modulation standard
"PAL_BG_STEREO''. Fig. 2-62 shows that modulation standard.
Channel tables
This section gives a detailed description of channel tables and their properties.
• Channel tables (see Fig. 2-60) have a Name. The name should comprise geographical
information, e.g. "SOUTHAMPTON'' or "EXAMPLE_WIPFING''.
• If desired, a Description giving further information on the channel table can be entered.
• Channel tables consist of Channels. The Cable TV Measurements option displays one channel
per line. A channel table must contain at least one channel.
Fig. 2-60 The channel table and its properties
Every channel has the following properties:
• The unique channel number No. can be used within measurements to change over from one
channel to another quickly.
• A Comment can be specified, e.g. the name of the program or the frequency band.
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