Interconnection Faults Between the LOA Card Enabled with the FC800 Service on the OSN 6800 and the Storage Switch

Publication Date:  2014-01-06 Views:  1391 Downloads:  0
Issue Description
In the entire interconnection process, the following faults occur in sequence:
1. The client side of the LOA card reports an R-LOS alarm. The storage switch has no receive optical power.
2. The client side of the LOA card reports an L-SYNC alarm. The storage switch has transmit optical power, and the connection fails.
3. The client side of the LOA card reports an R-LOS alarm for multiple times, and the client side of the peer site reports an REM-SF(CLIENT-SF) alarm. The interconnection with the storage device fails.
Alarm Information
1. The client side of the LOA card reports an R-LOS alarm. The storage switch has no receive optical power.
2. The client side of the LOA card reports an L-SYNC alarm. The storage switch has transmit optical power, and the connection fails.
3. The client side of the LOA card reports an R-LOS alarm for multiple times, and the client side of the peer site reports an REM-SF(CLIENT-SF) alarm. The interconnection with the storage device fails.
Handling Process
Troubleshoot the faults as follows:
1. Check the status of the client-side laser of the LOA card, the optical module type and rate, and receive optical power. Check relevant configurations on the storage switch.
2. Check the service type, level, and mode at the sites.
3. After verifying the preceding items, perform loopback tests by segment as follows:
a. Perform a software outloop test on the client side (RX or TX interface) of the local LOA card. If the corresponding interface on the storage switch can sense the loopback, the optical fibers, optical module on Huawei device, and optical module on the storage switch are normal. If this interface does not sense the loopback, you are advised to use jumpers or optical interface loopback to verify that the optical modules and physical optical fibers are correct.
b. Perform an inloop test from the internal logical channel of the local LOA card to the storage switch. If the corresponding interface on the storage switch can sense the loopback, the service type and channel are correctly configured. If this interface does not sense the loopback, check the service configurations.
c. Perform a hardware loopback test on the DWDM-side interface of the local LOA card. If the corresponding interface on the storage switch can sense the loopback, the service type and channel are correctly configured. If this interface does not sense the loopback, check the service configurations, internal logical channels, and DWDM-side optical module.
d. Perform a software outloop test on the DWDM-side interface of the local LOA card. If the corresponding interface on the storage switch can sense the loopback, the service type and channel are correctly configured. If this interface does not sense the loopback, check the mapping between the D40 interface and channel, and verify that the DWDM-side optical module is normal.
4. Use the preceding methods to perform loopback tests on storage switches at both ends. Complete fault location at each side and rectify the faults.
Root Cause
Fault 1: The client side of the LOA card reports an R-LOS alarm. Check whether the storage switch has transmit optical power and whether the optical module rate and the wavelength match. If the storage switch has no receive optical power, check whether automatic shutdown is enabled for the client-side laser of the LOA card and whether the DWDM-side laser is forcibly enabled.
Fault 2: Check whether the service type is correctly set on the LOA card and on the optical module of the storage switch, and whether the interface rate is correctly set on the storage switch.
Fault 3: Check whether services are correctly configured on the LOA card, whether the channel is normal, whether loopback occurs along the channel, and whether a fault occurs on the LOA card.
Suggestions
During the interconnection with the storage device, fault symptoms vary. Therefore, ensure correct configurations and optical fiber connections. Perform loopback tests by segment to locate the faults.

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