3DB 23063 ADAA - Rev 004 July 2007 Vol. IV-8-1
Chapter 8. Protection
Node and Terminal protection are considered separately. Refer to:
• Node Protection on page 8-1
• Terminal Protection on page 8-17
Node Protection
Link and Tributary protection mechanisms are supported.
Standard Link Protection configurations are:
• Hot-standby with two RACs
• Space diversity with two RACs
• Frequency diversity with two RACs
• Ring with two RACs or with a RAC/DAC 155oM pairing
For hot standby and diversity, the payload, auxiliary data, and remote alarm I/O
connections are protected.
For ring, the payload and remote alarm I/O connections are protected; auxiliary
data is not protected.
Dual Link Protection configurations provide master protection over two
protected link pairs. Options are:
• Frequency diversity over hot-standby
• Frequency diversity over space diversity
Table 8-1 summarizes the dual link protection options; two protected subordinate
links are in turn protected by a higher, master protection option. All RACs (RAC
30 or RAC 3X) must be located in the same INUe.
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