Transmission facilities
2-3
Wireless Solutions
DualMode 800 Enclosure
Maintenance Manual
MTX08
Transmit Receive Unit (TRU) and Multi-Channel Power Amplifier (MCPA)
The Transmit Receive Unit (TRU) needs no periodic testing in either the
analog or the digital mode — only do testing if you suspect a fault or want to
verify correct operation. The bit error rate (BER) test is typically used for
troubleshooting. BER is defined as the ratio of erroneous bits to the total
number of received bits in a transmission system. Another troubleshooting
test is the TDMA Modulation Accuracy Test which measures the Error Vector
Magnitude(EVM). The Multi-Channel Power Amplifier (MCPA) should be
tested for power output once a year. For these tests, refer to Chapter 11,
DualMode Radio Unit Testing, in this manual.
High Stability Master Oscillator (HSMO)
In dual-mode (mixed analog and digital) or digital sites, the HSMO frequency
should be checked once a year. In analog cell sites, the frequency is not as
critical and the HSMO need not be tested at all. Any problems with the
HSMO in an all analog cell site will show up in the TRU transmit frequency
tests. Refer to the tests in Chapter 5, HSMO Tests, in this manual.
Alarm Control Unit (ACU)
The ACU alarm input points for equipment such as fans, over-temperature
and door switches should be verified once a year. Alarm output contacts and
alarm reactions should be verified at the same time. Refer to the tests in
Chapter 8, ACU Tests, in this manual.
Transmit path insertion loss
Check the insertion loss of the transmit path once a year or as required by
base station carrier power level test results.
Fuses/breakers/fans
The ACU monitors the status of the fuses, breakers and fans. It is good
practice whenever you are at the cell site to visually inspect the fuses, check
that the correct breakers are on and that the fans are working.
Other equipment
Equipment not already specifically mentioned does not require periodic
maintenance.
Transmission facilities
Transmission facilities include pressurized transmission lines, microwave
radio equipment and any copper facilities. It is important that your facilities
are in good condition, otherwise cell site performance might be
compromised. See recommended maintenance intervals from the
manufacturer for the specific equipment.
Summary of Contents for DualMode 800
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Page 6: ...vi Publication history Nortel Networks Confidential 411 2051 500 Draft 00 01 November 1999...
Page 82: ...2 20 Periodic maintenance 411 2051 500 Draft 00 01 November 1999...
Page 90: ...3 8 Test equipment and precautions 411 2051 500 Draft 00 01 November 1999...
Page 100: ...5 6 Master Oscillator tests 411 2051 500 Draft 00 01 November 1999...
Page 106: ...6 6 Antenna and transmission line tests 411 2051 500 Draft 00 01 November 1999...
Page 116: ...8 4 Alarm Control Unit ACU tests 411 2051 500 Draft 00 01 November 1999...
Page 138: ...10 2 ICRM tests 411 2051 500 Draft 00 01 November 1999...
Page 200: ...12 10 Enclosure maintenance 411 2051 500 Draft 00 01 November 1999...
Page 208: ...A 8 Appendix A Frequency table 411 2051 500 Draft 00 01 November 1999...
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