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Chapter 3. 9500 MXC Nodes
Vol. II-3-96
Alcatel-Lucent
Receiver Switching
Receiver path switching (voting) between the two receiving RACs is hitless for
hot-standby and diversity configurations. The least errored data stream is
selected on a frame-by-frame basis within the online, bus-driving, RAC.
The
online
Rx RAC manages the Rx protection switch function, and is
transferred between RACs to always be with the online Rx RAC.
The RAC assigned as the secondary RAC in a protected primary/secondary
pairing is the default online RAC. Refer to Protected and Diversity Operation on
page F-10, Appendix F.
In the event of RAC/ODU receive
equipment
failure:
• If the designated
offline
RAC/ODU (default primary) receiver fails or is
removed, the receive data stream will not be errored as the RAC designated as
online
is controlling the switching and driving the TDM bus.
• If the designated
online
RAC/ODU (default secondary) receiver fails, the
receive data stream will not be errored if the failure occurs
prior
to the RAC Rx
diversity bus (between ODU antenna input and the RAC Rx diversity bus).
• If the designated
online
RAC/ODU (default secondary) receiver fails
after
the
diversity bus (between RAC Rx diversity bus and the TDM bus) or is removed,
the offline (primary) RAC/ODU is switched to become the online bus-driving
RAC. This switching is not hitless, and the primary RAC remains as the online
bus-driving RAC until changed within 9500 MXC CT, or a subsequent
bus-drive switch event.
• Switching from the
online
to
offline
Rx RAC will not be initiated if the offline
Rx RAC has failed, or the offline Rx RAC has been removed or replaced by an
incorrect plug-in. Similarly, a switch will not be initiated if the ODU associated
with the offline RAC has failed or is disconnected.
RAC Rx Online Switching Criteria
An online RAC switch is triggered by one or more of the following conditions:
• RAC plug-in is missing
• RAC plug-in is incorrect
• RAC FPGA software load failure
One gate-array is employed between the Rx diversity bus and the TDM bus. It
provides a function that is directly equivalent to a receive protection switch.
Correct operation is monitored, and in the event of an alarm (software corruption)
a RAC switch command is initiated. A software auto-reload to the alarmed gate
array (from the embedded software set held in the NCC CompactFlash) is also
initiated to attempt to clear the alarm.
Summary of Contents for 9500 MXC
Page 5: ......
Page 6: ......
Page 28: ......
Page 29: ...Volume I 9500 MXC Health and Safety Requirements...
Page 30: ......
Page 39: ...Volume II 9500 MXC System Description...
Page 40: ......
Page 56: ...Chapter 1 9500 MXC System Overview Vol II 1 16 Alcatel Lucent...
Page 94: ...Chapter 2 9500 MXC Terminals Vol II 2 38 Alcatel Lucent...
Page 218: ...Chapter 4 Outdoor Units Vol II 4 4 Alcatel Lucent...
Page 236: ...Chapter 6 9500 MXC Performance and Diagnostic Features Vol II 6 14 Alcatel Lucent...
Page 237: ...Volume III 9500 MXC Installation...
Page 238: ......
Page 268: ...Chapter 2 Outdoor Installations Vol III 2 26 Alcatel Lucent Figure 2 16 BGXZ Surge Suppressor...
Page 282: ...Chapter 2 Outdoor Installations Vol III 2 40 Alcatel Lucent...
Page 300: ...Chapter 4 Installing the IDU Vol III 4 6 Alcatel Lucent...
Page 321: ...Volume IV 9500 MXC CT...
Page 322: ......
Page 332: ...Chapter 1 9500 MXC CT Introduction Vol IV 1 10 Alcatel Lucent...
Page 362: ...Chapter 2 Setting Up 9500 MXC CT Vol IV 2 30 Alcatel Lucent...
Page 374: ...Chapter 3 Installation and Configuration Process Vol IV 3 12 Alcatel Lucent...
Page 384: ...Chapter 4 Licensing Vol IV 4 10 Alcatel Lucent...
Page 388: ......
Page 390: ......
Page 508: ...Chapter 8 Protection Vol IV 8 26 Alcatel Lucent...
Page 542: ...Chapter 10 Networking Configuration Vol IV 10 18 Alcatel Lucent...
Page 546: ......
Page 550: ...Chapter 12 Date and Time Configuration Vol IV 12 4 Alcatel Lucent...
Page 558: ...Chapter 13 Software Management Vol IV 13 8 Alcatel Lucent...
Page 562: ......
Page 632: ...Chapter 15 Diagnostics Vol IV 15 70 Alcatel Lucent Figure 15 27 Example Parts Screen...
Page 636: ...Chapter 15 Diagnostics Vol IV 15 74 Alcatel Lucent...
Page 637: ...Volume V Commissioning and Troubleshooting...
Page 638: ......
Page 699: ...Volume VI Appendices...
Page 700: ......
Page 791: ...9500 MXC User Manual 3DB 23063 ADAA Rev 004 July 2007 Vol VI B 65...
Page 792: ......
Page 826: ......
Page 846: ...Vol VI D 20 Alcatel Lucent...
Page 856: ...Vol VI E 10 Alcatel Lucent...
Page 873: ...9500 MXC User Manual 3DB 23063 ADAA Rev 004 July 2007 Vol VI F 17...
Page 874: ......