Alcatel-Lucent 9500 MXC User Manual page 505

Additional Procedures for IDU 20x
3DB 23063 ADAA - Rev 004 July 2007
The IDU 20x supports normal terminal protection for capacities to 20xE1 or
16xDS1 using the Hot Standby: Tributary Y-cable, or Hot Standby: Tributary
Always-On options. Follow the standard IDU protection configuration
procedures.
It also supports Hot Standby: Non-protected Tributary, which provides for
termination of 40xE1 or 32xDS1 tribs using separate 20xE1 or 16xDS1
connections to each IDU. In this configuration trib and PSU protection is not
supported, however RAC/ODU and path protection functions are retained,
though such protection is not hitless for traffic on the failed path/ODU.
• For 40xE1 or 32xDS1 operation, traffic from the standby IDU is routed to the
online IDU to support termination of 40xE1 or 32xDS1 tribs; 20/16 tribs from
each IDU. Figure 8-7 illustrates normal data flows for the two sets of trib traffic.
• Protection is provided for all 40/32 tribs for a path / ODU failure. Each IDU
can take Rx data from its directly connected ODU (default), or from the
partner ODU/IDU via the IDU-IDU expansion cable.
Switching on a failed path is not hitless; the 20/16 tribs assigned on the
failed path are restored from the remaining path (via the IDU-IDU
expansion cable) within 200 ms, the 20/16 tribs assigned on remaining path
are not affected. Figure 8-8 illustrates data flows for the two sets of trib
traffic for an offline ODU failure.
• Protection is not provided for all 40/32 tribs for a tributary module or PSU
equipment failure. Tribs terminated on the failed IDU (20/16 tribs) will be
lost; tribs terminated on the partner IDU will not be affected, providing the
recommended (default) protection configuration is used where each IDU is
taking Rx data from its directly connected ODU.
Configuration is identical to the standard IDU protection procedure except that:
• The IDUs are configured for 40xE1 or 32xDS1 link capacities in the Plug-ins
screen. These capacities must be supported by the appropriate license. Refer to
Volume IV, Chapter 4.
• Hot Standby: Non-protected Tributary must be selected in the Protection
screen.
• Ensure the default protection configuration has been applied. Use the System/
Controls screen to check that the following status is confirmed. If not, use the
Tx Online and Rx Source locks to force a change, then restore locks to Auto.
• Tx online is Primary.
• Primary Controls > RX Source is Primary (Primary IDU is taking its traffic
from its directly-connected ODU).
• Secondary Controls > RX Source is Secondary. (Secondary IDU is taking
its traffic from its directly-connected ODU).
9500 MXC User Manual
Vol. IV-8-23