Procedure 12-5.2: Back out high-speed OC-12 UPSR to OC-48 UPSR upgrade at node with single-rate circuit packs
Important!
This is not a stand-alone procedure. Perform this procedure only as directed by another procedure.
Steps
Important!
When optical fibers are disconnected during this procedure, inc. LOS, section DCC channel failed, and neighbor SYSCTL CP unavailable alarms are reported. The holdover mode active condition may also be reported depending on the provisioned system timing mode.
Complete the following steps to back out an OC-12 UPSR to OC-48 UPSR upgrade at a Alcatel-Lucent 1665 DMXtend node connected to the UPSR using single-rate circuit packs the Main slots.
1 |
Determine the current status of the upgrade at the node.
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2 |
If required, verify the active/standby status of the OC-48 OLIU circuit pack in Main slot M2 and perform manual switches to switch traffic away from an active circuit pack. Reference: Procedure 12-5.3: Verify active/standby status of circuit pack/port to be backed out | ||||||
3 |
Important! If the circuit pack is active for timing and/or transmission, opening the latch causes timing and/or transmission switches. Transmission hits (less than 60 ms) will occur for each separate protection switch. Open the faceplate latch on the OC-48 OLIU circuit pack in Main slot M2. Disconnect the optical fibers from the OC-48 OLIU circuit pack in Main slot M2. Then replace the OC-48 OLIU circuit pack in Main slot M2 with the original OC-12 OLIU circuit pack. Result: The system reports an unexpected CP type alarm for Main slot M2. The FAULT LED may light on the circuit packs in the Main slots, and the opposite end of the optical spans may report inc. OCN sig. degrade (BER) and section DCC channel failed alarms. Reference: Procedure 4-2: Install OLIU circuit packs in Main slots | ||||||
4 |
If required at both ends of the optical span to be backed out, perform the following to connect the original OC-12 OLIU circuit pack in Main slot M2 and the required OC-12 circuit pack/port at the opposite end of the original OC-12 optical span:
Result: At the opposite end of the original OC-12 optical span, the inc. OC12 LOS alarm clears. Reference: Procedure 14-4: Perform connection and verification of optical facility | ||||||
5 |
Important! The UPD/INIT button does not work during this upgrade. At the System View select Configuration → Update System → Upgrade. Select main-2 as the Directed Slot Choice and click OK. Result: A dialog box appears asking you to confirm executing this command. Click Yes. The original OC-12 OLIU circuit pack in Main slot M2 is tested and autoprovisioned. The system performs an automatic path protection switch, and all traffic is now active on Main slot M2. Transmission hits (less than 60 ms) occur as traffic switches from the circuit pack in Main slot M1 to the circuit pack in Main slot M2. The unexpected CP type alarm for Main slot M2 clears, and the system reports an unexpected CP type alarm for Main slot M1. Alarms may also be reported at other nodes in the ring. Transmission is now supported on the original optical span between Main slot M2 and the required OC-12 circuit pack/port at the opposite end of the original OC-12 optical span. | ||||||
6 |
Important! Perform this step only if the opposite end of the original optical span is an OC-12 port in a Function/Growth group and the Optical Synchronization Source is to be reprovisioned to the original OC-12 port. If required at the opposite end of the original optical span, select Configuration → Timing/Sync to reprovision the Optical Synchronization Source to the original OC-12 port on the OC-12 OLIU circuit pack in slot 1 of the Function/Growth group. Reference: Procedure 6-5: Network Element synchronization provisioning | ||||||
7 |
Important! Do not reconnect the optical fibers until instructed to do so. The optical fibers are reconnected after the OC-48 circuit pack/port is backed out at each end of the optical span. Open the faceplate latch on the OC-48 OLIU circuit pack in Main slot M1. Disconnect the optical fibers from the OC-48 OLIU circuit pack in Main slot M1. Then replace the OC-48 OLIU circuit pack in Main slot M1 with the original OC-12 OLIU circuit pack. Result: The original OC-12 OLIU circuit pack in Main slot M1 is tested and autoprovisioned. The unexpected CP type alarm for Main slot M1 clears, and the system reports an inc. OC12 LOS alarm for Main slot M1. Reference: Procedure 4-2: Install OLIU circuit packs in Main slots The following figure shows the state of the current node and the adjacent optical spans. 
STOP! To complete backing out the UPSR upgrade, return to the procedure that directed you to perform this procedure. End of steps |