9500 MXC User Manual
3DB 23063 ADAA - Rev 004 July 2007 Vol. II-3-75
Tributary Protection
E3/DS3 and STM1/OC3 DACs, may be paired to provide hot-standby tributary
protection.
The protectable DACs are:
• 2xDAC 3xE3/DS3M
• 2xDAC 155o or
• 2xDAC 2x155o
• 2xDAC 2x155e
• 2xDAC 155oM
Trib protection switching is not hitless.
Except for the DAC 155oM, Tx and Rx tribs are switched independently.
When a switch occurs, all tribs either Tx or RX, or Tx and Rx depending on the
failure mode, are switched together.
NCC Protection
The NPC plug-in provides protection for the NCC bus management and power
supply functions:
• Bus management switching is not hitless.
• Power supply protection is hitless.
For more information on the NPC and its protection function, refer to NPC on
page 3-71.
Hot Standby and Diversity
The INU supports three non-protected links, or one protected plus one
non-protected link. The INUe supports up to three protected links.
Two RACs and two ODUs are used for protected operation. For single-antenna
protected operation, the two ODUs are direct-mounted on a coupler, which in
turn is direct or remote mounted to its antenna.
Space and frequency diversity can be combined to provide hybrid diversity.
Receive path switching is hitless between two online-receiving RAC 30s,
RAC 3Xs, and RAC 40s.
Transmit switching for hot-standby and space diversity is not hitless. Refer to
Hot-standby and Diversity Switching Criteria on page 3-93.
For single antenna protected operation, equal or unequal loss couplers are
available:
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