OSN1500 transmission equipment expansion is the replacement and upgrading of various types of communication equipment that have been put into operation, which determines that the expansion process will inevitably have a certain impact on the existing equipment and communication, which may lead to communication interruption. In order to minimize the impact and improve the efficiency and quality of capacity expansion, the following principles and ideas should be followed when carrying out the construction of equipment capacity expansion: first, export the scripts of the involved network elements, carefully analyze the alarms, and back up the database. Second, prepare the data involved in the equipment to be changed. Third, carry out the replacement of the single board. Fourth, the data that has been prepared is distributed. Fifth, the newly constructed site should be counted for its service time slot when expanding into the network. Sixth, after the completion of the above operations, to be observed on the equipment and found that the business is normal, you can notify the data personnel to continue to observe in order to confirm that the data expansion is normal.

Problem description

With the rapid development of IP services, there are more and more demands for bandwidth upgrading of SDH networks. For example, the modification of the original network requires upgrading the SDH ring from STM-16 to STM-64. So the capacity of the link upgrade is inevitable, the current method of roughly two kinds of a method is to use the traditional method, the other method is to use the T2000 Expansion Wizard to do the link upgrades, the use of the Expansion Wizard upgrades due to the existing business does not affect so it is very convenient. On the use of T2000 Expansion Wizard for link upgrading our company has two versions of the guide, but the restrictions are not very specific, not all the restrictions listed clearly. In this paper, after the R & D confirmation of all the restrictions to explain.

1. Supported devices are OSN7500 (5.21.13.40 or later), OSN3500 (5.21.13.40 or later), OSN2500 (5.36.12.40 or later), OSN1500 (5.36.13.40 or later), this function is related to the command supported by the host computer, and the previous version is not supported. Other devices are not supported.

2. It does not support non-SDH devices, and does not support SDH devices upgraded by logical board position;

3. in the case of the existence of shared optical paths, only the upgrade of only one multiplexed segment protection group configured is supported, and the upgrade of multiple multiplexed segment protection groups configured is not supported;

4. Upgrade is not supported when the single board is equipped with AU3 services;

5. does not support the upgrade of link capacity across the WDM network;

6. does not support link capacity upgrade on multi-optical port single board. The function of single board change only supports the replacement of port rate consistency, for example, it does not support the original SL1 single board, and now it is to be replaced by SD4, so the single board change cannot realize the link capacity upgrade, and you need to use this wizard to complete the function.

7. Cross-REG link capacity upgrade is not supported.

8. The supported protection subnet types are: 2-fiber unidirectional multiplexing segment ring, 2-fiber bi-directional multiplexing segment ring, 4-fiber bi-directional multiplexing segment ring, 1+1 linear multiplexing segment, 1:N linear multiplexing segment, as well as unprotected chain, ring, PP ring and SNCP.

9. It is required that there is no fault in the protection subnet and no inversion occurs before the operation. When deleting the original protection group, the host service will not be deleted, and the service in the protection subnet will lose protection during the operation.

10. For intelligent network elements, routes must first be optimized and locked before links can be upgraded.

11. The version of the network management is required to be T2000V002R002C01 or later.

12. Conduct a multiplexing segment inversion test on the upgraded area to confirm that the working and protection channels are normal and that there is no abnormality in the inversion.

13. For multi-optical boards, it is not possible to upgrade by this method.

14. This method is only applicable to upgrade the link of the same slot of the same network element, and cannot be used for the replacement of the network element or the replacement of the slot.

Root Cause

No

Recommendations and conclusions

Before upgrading a link, carefully read the OptiX NG-SDH Line Rate Upgrade Guide - 20080110-B>> Circuit Technology White Paper (Capacity Expansion Wizard - Link Capacity Upgrade)>>. It is important to read both, as the content is different, to learn the specific upgrade procedures.

If the upgrade fails using this method, it is not recommended to rewind directly if time permits. You can use the traditional method to upgrade part of the link. The steps can be summarized as follows

1. Delete the service

2. Delete fiber

3.Delete protection group

4. Delete the clock setting that uses the upgrade board as the clock source.

5. Create a new protection group, create part of the VC4 protection group, so that the whole link does not need to be upgraded at once, while the service can be protected.

When the construction of communication transmission equipment expansion is completed, it is necessary to test the communication line that has been expanded to check whether its performance is normal, and carry out the trial operation of the project, which is also an important link to ensure the stable operation of the communication transmission project. In this section, the competent technical personnel should test the alarms and channel performance of each site, and cooperate with the network management center to confirm that there is no abnormality in the communication transmission after capacity expansion and then observe for at least one hour before leaving. At the same time, it is also necessary to focus on strengthening the quality of signal transmission in key areas such as communication equipment, interface terminals and signal converters to ensure that there is no danger in all aspects before arranging for the project to be put into operation.

This chapter of related technical information and SDH equipment troubleshooting process provided by Shenzhen Optical Transmission Network Technology Co., Ltd ( www.opticaltrans.com), reproduced please retain! Huawei SDH Optical Transmission Equipment,SDH Transmission Equipment Sales