9500 MXC User Manual
3DB 23063 ADAA - Rev 004 July 2007 Vol. II-3-73
Protected Operation
This section provides data on the Node protection options and their operation.
Refer to:
• Protection Overview on page 3-73
• Hot Standby and Diversity on page 3-75
• Dual Protection on page 3-76
• Ring Protection on page 3-77
• Super PDH Rings on page 3-78
• Super PDH Ring Operation on page 3-79
• 1+1 Protected Ring Links on page 3-84
• Co-channel XPIC Operation on a Ring on page 3-86
• Ethernet Traffic on a Ring on page 3-87
• DAC/Tributary Protection on page 3-92
• Protection Switching Criteria on page 3-93
• NCC Protection with NPC Option on page 3-101
For additional information on protection operation, refer to Appendix I.
Protection Overview
9500 MXC Node includes options for protection of hardware, radio path,
tributary, and NCC functions.
Hardware and Radio Path Protection
RACs and ODUs are used in pairs to support hot-standby, space diversity,
frequency diversity, or ring protection.
Generally speaking path protection is about providing for protection against
changes in radio-path variables, such as anomalies caused by signal reflection
over water or by ducting. Such protection demands hitless (errorless) receive
switching between the alternate (protected) radio paths.
Hardware/equipment protection is about providing backup (alternate) hardware
that can be switched into service in the event of a hardware failure. Such
Protected operation between an INU and IDUs is not supported. Where protected
IDUs are to be used, they must be at both ends of the link.
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