Atec Aeroflex-3920B - Manual (Page 10)

Trajectory Tile Maximized
Call Processing Highlights
The 3920B can be freely configured to emulate a TETRA network
by selection of the appropriate channel plan, country code, net-
work code, color code, etc. Once configured, registration, group
attachment and TETRA call types including group call, private call,
emergency call, telephone call and user defined call can all be tested.
SDS messages (types 1 to 4 and SDS-TL) can be sent or received.
The 3920B TETRA system option displays a range of mobile reported
information relating to registration, group attachment, test mode,
call type, called party, status messages, text messages and DTMF
digits dialed.
Protocol History Maximized Tile
TETRA Test Mode T1 and T1 loopback
The TETRA MS and TETRA BS options provides various T1 test
signals as defined in ETSI EN 300 394-1 for performing manual
testing of TETRA base station and mobile stations receivers. The
test signal T1 in the MS T1 application provides control information
to the mobile to aid testing, e.g. burst type, max, TX power, loopback
commands. These T1 test signals can be used by the mobile in a
test mode to output received demodulated data to a test interface for
external processing of receiver Bit Error Rate (BER). Alternatively,
the mobile can be commanded by the test signal T1 to loop back
the received data to the 3920B which can then perform BER/MER/
PUEM measurement. In the BS T1 application, the 3920B also
supports T1 loopback BER/MER/PUEM measurements for base
stations.
TETRA Test (TT) Protocol Support
The TETRA MS option provides support for the TETRA Test (TT)
protocol as defined in ETSI EN 300 394-1. The TT protocol allows
the mobile to be tested in a loopback mode whereby the mobiles BER,
MER and RBER can all be reported.
Audio Testing
Subjective audio testing is supported for simplex and duplex calls.
Audio spoken into the mobile’s microphone is received and stored by
the test set, which then re-transmits the speech so that it is replayed
through the mobile’s speaker or ear piece with 2 seconds delay added,
thus, providing an end-to-end audio quality test.
Direct Mode Functionality (390XOPT112)
The 3920B also supports the testing of Direct Mode Operation. The
3920B can initiate or receive calls from a mobile that is operating
in direct mode and then make transmitter measurements such as
power, frequency error and modulation accuracy. The operation and
graphical displays are very similar to the normal TETRA operation.
TETRA Energy Economy Mode (390XOPT114)
This optional mode of operation provides protocol signaling to
control a mobile’s energy economy mode from “Stay alive” through
energy groups EG1 (shortest sleep) to EG7 (longest sleep) and is
used in conjunction with the comprehensive signaling capabilities
already within the TETRA MS option. This operation enables
developers, operators and users to configure battery test scenarios to
simulate particular operational conditions. It gives them the testing
flexibility to characterize the expected battery life performance in its
intended operational use on the network.
TEDS Test Operation (390XOPT117)
With the TEDS (TETRA Enhanced Data Service) testing operation,
the 3920B has the capability to test TEDS capable mobile stations.
The testing is performed by using the TEDS T4 test mode of oper-
ation. This enables the 3920B to make transmitter and receive per-
formance measurements. These measurements include:
• Power
• Burst Timing
• RMS and Peak Vector Error
• Frequency Error
• IQ Imbalance
• Bit Error Rate
• Message Error Rate
The 3920B can also display graphically the modulation error. These
graphical displays are:
• Constellation
• Vector Error
• Phase Error
• Magnitude Error
AUTO-TEST ii
Available as an option for the 3920B is the Auto-Test II operation.
Providing the ultimate in flexibility, this option gives you the ability
to control the operation of 3920B using the TCL scripting language.
You control the functions of the 3920B through the use of RCI com-
mands, which are sent as part of the TCL program.
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