R&S SU 4200 In-Band Signaling
6125.0226.12.01 3.60
3.8 In-Band Signaling
In-band Signal ing\In-band Signaling "Radio".doc
3.8.1 Introduction/Overview
Introduction/
Overview
To reduce the number of lines, in particular for transmitting signals over
long distances, the use of the bidirectional in-band technique via a 2-pair
AF/telephone line per radio unit (receiver, transmitter, or transceiver) is
recommended. AF carriers are modulated with control and signaling
information and inserted in-band without affecting the speech quality.
The R&S Series 4200 radios support a special audio in-band technique.
This in-band technique is used to enable radio functions via signalization on
the audio channel.
The radios of the R&S Series 4200 support the following in-band function:
• Signaling of PTT on transmitter side
3.8.2 Support and Configuration of In-Band Signaling
Description
To setup the in-band signaling functionality, it is necessary to configure
various parameters with the Service and Maintenance Tool R&S ZS 4200
via the USB (see also chapter
3.3 Configuring with the R&S ZS 4200).
Note: The operation of the Service and Maintenance Tool R&S ZS 4200 is
described in detail in the corresponding operating manual.
3.8.2.1 In-Band Signaling of PTT with Different Audio Tones
Description
The PTT can be signaled via the TX audio channel with the tones of
2040 Hz, 2300 Hz, 2970 Hz or 3100 Hz. To activate the in-band PTT
signaling, it is required to configure the functionality.
The configuration has to be done with the parameters:
• PTT Signaling to enable or disable the PTT in-band signaling
• PTT Signaling Threshold configures the PTT tone detector relating to
TX audio level setting
RSSI Output Conf iguratio n\RSSI Output Co nfigurati on "Radio".doc
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