Chapter 1. Commissioning
Vol. V-1-4
Alcatel-Lucent
Trib BER Measurement
Trib BER measurements can be made using an external BER tester, or the
built-in 9500 MXC capability.
Unlike a background measurement, which is single-link based, a trib test is used
to check a tributary circuit from end-to-end, meaning multiple links can be
involved.
E1/DS1, E3/DS3, and STM1/OC3 DACs include a PRBS generator and a G.821
receiver to support looped, and both-way tests on tribs:
• For a
looped
test the originating DAC provides the PBBS generator
and
G.821
receiver. Requires a loopback on the trib/circuit, which can be applied using CT
or a physical loop.
• For a
both-way
test, a PRBS generator on one DAC is G.821 received on its
remote DAC, and vice-versa. No loopback is required.
Within 9500 MXC, loopbacks can be set within DACs, RACs, and on the TDM
bus. For information on these options refer to System/Controls on page 15-43,
Volume IV, and to Circuit Loopbacks for 9500 MXC Node on page 15-67.
Where an
external
BER tester is to be used, refer to manufacturer’s instructions.
Fade Margin
This test is designed to check that the expected (calculated) fade margin for a link
matches actual performance.
The expected fade margin should be included in the link installation datapack
together with Tx power, system losses, antenna gains, the effective radiated
power, free space path loss, expected receive signal level and the calculation for
link availability.
The fade margin test measures the difference in receive signal level between the
normal, operational level, and the threshold level, the level at which bit errors
appear. The threshold level can be specified for a bit error rate (BER) of 10
-6
or
10
-3
. For 9500 MXC, the difference between 10
-3
and 10
-6
thresholds is not more
than 2dB
External testers provide superior measurement accuracy and access to a wider
range of test and measurement functions.
Fade margin measurement should only be conducted after it has been verified
that expected RSLs, as indicated in CT performance screens, are correct at both
ends of the link. If an RSL is low, the reason for this must first be investigated and
resolved.
Содержание 9500 MXC
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Страница 29: ...Volume I 9500 MXC Health and Safety Requirements...
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Страница 39: ...Volume II 9500 MXC System Description...
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Страница 56: ...Chapter 1 9500 MXC System Overview Vol II 1 16 Alcatel Lucent...
Страница 94: ...Chapter 2 9500 MXC Terminals Vol II 2 38 Alcatel Lucent...
Страница 218: ...Chapter 4 Outdoor Units Vol II 4 4 Alcatel Lucent...
Страница 236: ...Chapter 6 9500 MXC Performance and Diagnostic Features Vol II 6 14 Alcatel Lucent...
Страница 237: ...Volume III 9500 MXC Installation...
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Страница 268: ...Chapter 2 Outdoor Installations Vol III 2 26 Alcatel Lucent Figure 2 16 BGXZ Surge Suppressor...
Страница 282: ...Chapter 2 Outdoor Installations Vol III 2 40 Alcatel Lucent...
Страница 300: ...Chapter 4 Installing the IDU Vol III 4 6 Alcatel Lucent...
Страница 321: ...Volume IV 9500 MXC CT...
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Страница 326: ...Chapter 1 9500 MXC CT Introduction Vol IV 1 4 Alcatel Lucent Figure 1 3 Standardized 9500 MXC Logos...
Страница 332: ...Chapter 1 9500 MXC CT Introduction Vol IV 1 10 Alcatel Lucent...
Страница 362: ...Chapter 2 Setting Up 9500 MXC CT Vol IV 2 30 Alcatel Lucent...
Страница 368: ...Chapter 3 Installation and Configuration Process Vol IV 3 6 Alcatel Lucent Figure 3 1 9500 MXC CT Menu Bar Menus...
Страница 374: ...Chapter 3 Installation and Configuration Process Vol IV 3 12 Alcatel Lucent...
Страница 384: ...Chapter 4 Licensing Vol IV 4 10 Alcatel Lucent...
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Страница 508: ...Chapter 8 Protection Vol IV 8 26 Alcatel Lucent...
Страница 542: ...Chapter 10 Networking Configuration Vol IV 10 18 Alcatel Lucent...
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Страница 550: ...Chapter 12 Date and Time Configuration Vol IV 12 4 Alcatel Lucent...
Страница 558: ...Chapter 13 Software Management Vol IV 13 8 Alcatel Lucent...
Страница 561: ...9500 MXC User Manual 3DB 23063 ADAA Rev 004 July 2007 Vol IV 14 3 Figure 14 2 Login Screen for Admin...
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Страница 632: ...Chapter 15 Diagnostics Vol IV 15 70 Alcatel Lucent Figure 15 27 Example Parts Screen...
Страница 636: ...Chapter 15 Diagnostics Vol IV 15 74 Alcatel Lucent...
Страница 637: ...Volume V Commissioning and Troubleshooting...
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Страница 688: ...Chapter 2 9500 MXC Troubleshooting Vol V 2 32 Alcatel Lucent Terminal FAN Alarm Hierarchy FAN Hardware Fan Failure FAN...
Страница 699: ...Volume VI Appendices...
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Страница 706: ...Vol VI A 6 Alcatel Lucent Figure A 2 Excerpt from a Circuit Allocation Sheet for the Example Ring in Figure A 1...
Страница 791: ...9500 MXC User Manual 3DB 23063 ADAA Rev 004 July 2007 Vol VI B 65...
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Страница 836: ...Vol VI D 10 Alcatel Lucent Figure D 3 Static Routing Screen for Node B in Figure D 2 3 192 168 2 1 Lyons Dpt...
Страница 846: ...Vol VI D 20 Alcatel Lucent...
Страница 856: ...Vol VI E 10 Alcatel Lucent...
Страница 873: ...9500 MXC User Manual 3DB 23063 ADAA Rev 004 July 2007 Vol VI F 17...
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