Digital Radiocommunication Tester CMD80
Precise high-speed measurements on CDMA, TDMA and analog mobiles
For use in
• production
• quality assurance
• service
• development
CMD80 – the multitalent
Additional capability continues to be
added to the proven CMD80 platform. In addition to CDMA, AMPS
(N-AMPS) and TACS (J/N/E-TACS),
digital AMPS (IS-136) measurements
on mobile stations are now posible
with option B84. CMD80 is thus able
to support all multiple access methods
presently used in mobile communications (FDMA, CDMA, TDMA) on a
single hardware platform.
CMD80 with option B84 provides
unsurpassed test coverage for the
IS-136 standard, offering many capabilities that are not available on some
dedicated IS-136 test sets. Among
these are half-rate channel support,
peak and statistical adjacent-channel
power measurements, carrier switching time measurements, etc. This
broad IS-136 test coverage will
enhance the CMD80´s use in manufacturing tests as well as in engineering applications.
All standards at a glance
Frequency band Type designation Airlink standard
US Cellular (800 MHz) CMDA IS-95
TDMA IS-136
AMPS/N-AMPS TIA-553, IS-91
Japan Cellular CDMA T53, IS-95
N-TACS/J-TACS
China Cellular CDMA IS-95
E-TACS/TACS
US PCS (1900 MHz) CDMA J-STD008, UB-IS-95
TDMA IS-136
Korea PCS (1800 MHz) CDMA J-STD008, UB-IS-95
Korea2 PCS CDMA J-STD008, UB-IS-95
The family members at a glance
CMD80 – CMDA, IS-136, AMPS and more
• CDMA, digital AMPS, AMPS, TACS in one box
• High measurement accuracy and speed
• Remote control via IEEE488/IEC625 bus
• Autotest and remote control via RS232
• Suitable for production, development and service
CMD52 – the leading GSM900 production tester
• All signaling required for GSM900 testing
• Highest measurement accuracy and speed
• Remote control via IEEE488/IEC625 bus
• Autotest and remote control via RS232
• Go/nogo test as well as service mode for exact fault location
CMD55 – the multiband GSM production tester
• GSM900, GSM1800 and GSM1900
• Testing of handover from GSM900 and back
• Other features as CMD52
CMD60 – pure DECT dedication
• Compact, lightweight and extremely fast
• Suitable for service, production and development
• Remote control via IEEE488/IEC625 bus + RS232
• Automated regression and stress testing of DUT
• Automatic go/nogo testing of fixed and portable part
CMD65 – the most versatile production tester
• GSM plus DECT in a single box
• Features equal the combination of CMD55 and
CMD60 in almost all respects
Manual operation philosophy
Research and development engineers
have found the CMD‘s large clear LC
display and user interface with logically structured menus unsurpassed
when measuring RF parameters. This
is true both in the manual test mode
and in the flexible module test with
system-specific signal generator and
burst analyzer. During call setup the
network and system-specific signaling
parameters allow the R&D engineers
to control the influence of signaling
parameters on the mobile´s behavior
in the network.
quality assurancedevelopment
User-definable autotest
The user-friendly display and operation of the CMD is a main requirement
when testing manually, but for automated testing the engineer wants a
quick and easy way to a ready-made
autotest. The CMD family of testers
offers different ways of creating such
autotests and test scripts, depending
on the CMD model and the test
requirements.
• Voice loopback and comprehensive testing of mobiles
• Powerful signaling capabilities
• Short measurement time
ensuring high throughput
• High measurement accuracy
• Simple interactive operation
• No specialized network
knowledge required
• Service mode for exact fault
location
• Autotest – complete mobile
testing at a keystroke
• Very fast remote control
operation
• Compact and lightweight
• Excellent price/performance
ratio
In addition to mobile radio networks based on AMPS (Advanced
Mobile Phone System) and CDMA
(Code Division Multiple Access)
standards, more and more networks with underlying TDMA (Time
Division Multiple Access) method
are gaining importance.
The demand is mostly for dual-mode
mobile phones with CDMA/AMPS
(IS-95 standard) or D-AMPS/AMPS
(IS-136 standard) functionality – frequently also for dual-band mobile
phones in the 800 MHz (US Cellular) and 1900 MHz (US PCS) frequency bands. This fact inevitably
leads to the need for a mobile radio
tester that covers all three standards
in both frequency bands.
Many wireless manufacturers are
migrating toward "universal" production and test lines for mobile
phones, with an eye toward
reducing capital, maintenance,
and personnel costs. Until now,
these economies have been
diluted by the cost of equipping
test lines with dedicated test sets
for every wireless standard.
With the addition of the new
option B84, the CMD80
addresses IS-136, CDMA, AMPS,
N-AMPS, TACS, E-TACS, J-TACS,
and N-TACS test needs. Wireless
manufacturers now have an effective way to implement cost-efficient universal manufacturing
lines for wireless phones.
... meeting the challenges
of modern communications
2 Digital Radiocommunication Tester CMD80
Digital Radiocommunication Tester CMD80
2
production service
Fast IEEE bus
In a production line there are two main
factors that contribute to high throughput and product quality: IEEE-bus
speed and measurement repeatability.
The high speed is obtained by parallel
measurements and the possibility of
issuing multiple commands in a single
IEEE string. With combined measurements and measurements like RF peak
power which takes only milliseconds,
time-consuming power level adjustments where multiple measurements
are required are completed in sec-
onds. The high level of measurement
repeatability offered ensures the highest possible quality of the end product
leaving the factory.
Covering any need for test modes
Service and repair of digital mobiles
and cordless phones call for a variety
of tests, ranging from simple voice
loopback test to complete factory-like
production tests. The CMD range of
products offers cost-effective solutions
for manual testing, stand-alone
autotest, as well as remote RS232
operation solutions covering any test-
ing need. Every CMD comes with the
same large display and user interface
for manual testing of phones and/or
modules and RS232 interface for
remote operation.
Base-station survey measurements
These are often done on real base stations or by using analog signal generators with power amplifiers. The CMD
is able to simulate any CDMA, IS-136,
AMPS and TACS base station. This
feature enables close-to-life conditions
without having to use a real BTS.
Digital Radiocommunication Tester CMD80 3
Digital Radiocommunication Tester CMD80 3
(1)
The HOME menu allows simple selection of mobile
radio standard (CDMA, TDMA, analog) and frequency
band (Cellular, PCS).
(2)
The test menus are divided into two sections; mobilespecific measurement results are displayed on the left,
the main settings of the BS signal on the right.
(3)
In the HANDOFFS/TRANSITIONS menu different kinds
of handoffs between the mobile radio standards can be
performed. After the handoff the user can choose
between standard tests and voice loopback test.
(4)
In the IS-136 mode the CMD can send a user-defined
short message (SMS) to the mobile.
1
2
3
4
Measurement technology
Measurements are based on ultramodern digital signal processing. The
results are thus available within the
shortest possible time, which means
an enormous benefit in speed-dictated
mass production. DSP technology has
two important benefits: measurement
functions can be enhanced by software upgrades and new measurement
techniques can be added solely by
software modifications.
The individual measurements for the
various standards are derived directly
from the relevant specifications and
are preconfigured. Measurements can
thus be performed without in-depth
knowledge of the relevant network.
Basically, CMD80 provides two different measurement modes for each network. Measurements can be performed either as a module test (ie without call setup to the DUT) or as a manual test with full signaling. In the latter
case a call setup for performing the
measurement can be made both from
the base station (which is simulated by
the CMD80) and from the mobile. In
this mode it is also possible to set up a
call with voice loopback. The audio
data picked up by the microphone of
the mobile phone are buffered in the
CMD80 and reflected to the mobile
under test after a delay of about two
seconds. In this way speech quality of
the DUT can be verified.
In the signaling mode, implicit handoffs can be made within the same
standard (ie a D-AMPS handoff to
another digital traffic channel – a new
channel number – or changeover to
another timeslot at the same TDMA frequency) as well as handoffs to other
standards, if defined. This is an important criterion for testing multimode/
multiband mobile phones. The measurements themselves are adapted to
the relevant transmission standard.
4 Digital Radiocommunication Tester CMD80
Loading...