What is the Protection Relationship among Huawei OSN Products?

TPS protection relationship of all Huawei OSN products is listed as follows:

Huawei OSN 7500:

E1/T1: A maximum of one group of 1:4 protection. Slot 1 protects Slots 2, 3, 7 and 18.

E3/D3/E4/STM-1e: A maximum of one group of 1:3 protection. Slot 18 protects Slots 2, 3 and 7. 

Huawei OSN 3500:

E1/T1: A maximum of one group of 1:8 protection. Slot 1 protects Slots 2–5, 13–16.

E3/D3/E4/STM-1e: A maximum of two groups of 1:3 protection. Slot 2 protects Slots 3, 4 and 5. Slot 16 protects Slots 13, 14 and 15. A maximum of two groups of 1:1 protection. Slot 2 protects Slot 3 and Slot 16 protects Slot 15.

Huawei OSN 2500:

E1/T: If slots are not split, there is a maximum of one group of 1:4 protection. Slot 5 protects Slots 6, 7, 12 and 13. If Slots 5, 6 and 7 are split, there are a maximum of two groups of 1:2 protection. Slot 5 protects Slots 6 and 7. Slot 19 protects Slots 20 and 21.

E3/D3/E4/STM-1e: A maximum of two groups of 1:1 protection. Slot 6 protects Slot 7, and Slot 13 protects Slot 12.

Huawei OSN 2500CRG:

The OSN2500CRG does not support TPS protection.

Huawei OSN 1500I:

E1/T1: If slots are not split, there is a maximum of one group of 1:2 protection. Slot 11 protects Slots 12 and 13. If Slots 11, 12 and 13 are split, there is a maximum of one group of 1:2 protection. Slot 1 protects Slots 2 and 3, Slots 6 protects Slots 7 and 8, and Slot 11 protects Slots 12 and 13.

E3/D3/E4/STM-1e: A maximum of two groups of 1:1 protection. Slot 12 protects Slot 13.

Huawei OSN 1500II:

E1/T1: If slots are split, there is a maximum of one group of 1:1 protection. Slot 2 protects Slot 12. 

Planning Transparently Transmitted EPL Services on Huawei OSN2500

The transparently transmitted EPL services can be used to plan the Ethernet services.

Service Requirement
Company A and company B at NE 1 need to transmit data services respectively to company A
and company B at NE 2. It is required that services of company A and company B are totally
isolated from each other. Both company A and company B provide 100M Ethernet electrical
interfaces. Company A requires 10M bandwidth and company B requires 45M bandwidth.

Networking Application
Services of company A and company B are required to be transparently transmitted between NE
1 and NE 2. Two OptiX OSN 2500 systems can be used as NE 1 and NE 2.

At NE 1, services from company A and company B are accessed respectively from Ethernet

ports. At NE 2, services from company A and company B are also respectively accessed from

Ethernet ports.

In the line, the EPL service from company A is carried by one VCTRUNK and the EPL service

from company B is carried by another VCTRUNK.

Application Scheme

Use the port routing scheme for the transparently transmitted EPL services.

Hardware Configuration

Configure one EFS4 for NE 1 and NE 2 to access Ethernet services from company A and

company B respectively.

Alarm Clearing A_LOC on Huawei Optix OSN2500

The A_LOC on Huawei Optix OSN2500 is an alarm indicating the loss of clock in the upstream direction of the bus.

Parameters
When you view an alarm on the network management system, select the alarm. In the Alarm
Details field display the related parameters of the alarm. The alarm parameters are in the
following format: Alarm Parameters (hex): parameter1 parameter2...parameterN. For details
about each parameter, refer to the following table.

Impact on the System
When the A_LOC alarm occurs, the services carried by the board path are interrupted.

Possible Causes
The possible causes of the A_LOC alarm are as follows:
The PDH equipment interconnected to the service path is faulty.
The service type is incorrectly configured.
The service cross-connection is incorrectly configured.
The board hardware is faulty.
The cross-connect and timing board is faulty.

Procedure
Step 1 Check whether Huawei PDH equipment interconnected to the service path is faulty. If yes, take priority to remove the fault, and then check whether the A_LOC alarm is cleared.
Step 2 View the A_LOC alarm on the U2000, and then confirm the path number according to the alarm parameters.
Step 3 Check whether the service configuration of the path is correct. Make sure that the service type
at the local end is consistent with that at the remote end, and the cross-connection is correctly
configured. Then check whether the A_LOC alarm is cleared.
Step 4 If the alarm persists, check whether any hardware of the board that reports the A_LOC alarm is faulty on the U2000. If yes, perform a cold reset on the board. Then check whether the A_LOC
alarm is cleared.
Step 5 If the alarm persists, replace the board.
Step 6 If the alarm persists, perform a cold reset on the cross-connect and timing board. Then check
whether the A_LOC alarm is cleared.
Step 7 If the alarm persists, check whether the cross-connect and timing board is faulty. If yes, replace the cross-connect and timing board. Then the A_LOC alarm is automatically cleared.