Audio Generator and Analyzer (Option CMU-B41) CMU
1100.4903.12 4.76 E-10
Options and Extensions
The function groups described in this section require the installation of hardware options; for a complete
list of deliverable options refer to the data sheet. Software options for digital and analog network tests
are described in separate operating manuals; for a list refer to the Manuals section before tabbed di-
vider no. 1 of this manual.
Audio Generator and Analyzer (Option CMU-B41)
Option CMU-B41, Audio Generator and Analyzer, provides an additional Audio function group com-
prising the functions for generating and measuring audio signals. It can be accessed either from the
Menu Select menu (standalone audio measurements) or by switching over from any of the GSM-MS,
Bluetooth, cdmaOne (IS 95)-MS, CDMA2000, or TDMA (IS 136)-MS measurement menus. In the latter
case, the audio circuit of a mobile station can be tested without releasing a call connection or changing
the signalling state of the CMU.
Standalone audio measurements are performed with default connector settings, the audio signals being
applied to the connectors AF IN/AUX 1 (input) and AF OUT/AUX 2 (output) on the front panel of the
instrument (see Chapter 1). If Audio is used in the context of the network tests (Signalling test mode),
the AF/RF
tab of the associated Connect. Control menu allows to select the input source of the
CMU speech encoder and the output destination of its speech decoder (for more information refer to
the relevant network operating manuals).
Analyzer/Generator Menu
The main menu Analyzer/Generator defines the DC or sinusoidal AC signals generated by the two
audio generators and displays the voltage of the two measured audio signals.
The measurement control softkey Analyzer 1, which changes to Analyzer 2, depending on the audio
measurement application selected) controls the measurement, indicates its status (RUN | HLT |
OFF) and opens the configuration menu Audio Configuration. The hotkeys associated to the meas-
urement control softkey define the scope of the Audio measurement.
The other softkeys to the right of the test diagram are combined with various hotkeys (e.g. the hotkeys
AF Max. Level and AF Mode belong to the softkey Analyzer Level). The softkey/hotkey combinations
provide test settings and switch over between different measurements.
The Analyzer/Generator menu is opened from the main menu Menu Select (with associated key at front
of instrument) or via the Audio hotkey which is available in all GSM-MS, Bluetooth, cdmaOne (IS 95)-
MS, CDMA2000, or TDMA (IS 136)-MS measurement menus. Compared to the standalone case, the
network audio option offers an extended functionality (see Fig. 4-33 below):
The Connect. Control softkey from the previous (calling) GSM function group is also available in Audio.
The corresponding menu is described in the relevant operating manuals; see overview of CMU
documentation at the beginning of the present CMU manual.
A symbol indicating the GSM test mode is displayed in the menu header.
A hotkey switching back to the GSM function group shows at the bottom of the menu.
The actual Audio functionality is identical in the standalone and network modes.
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