# Method used to determine whether the corrected error count is proper

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Question:
A huge corrected error count commonly exists on OTU boards with FEC. How do I determine whether the number is proper?
None
Analysis:
The corrected error count is associated with bit error rate.
Bit error rate = Corrected error count/(Time x Board rate).
The corrected error count is expressed in bits, and the board rate is expressed in bit/s. Therefore, the time must be converted into seconds. For example, the rate of an LWF board is 10 Gbit/s. If the 24-hour corrected error count is 5 million, the BER is calculated as follows: (500 x 10000)/(24 x 3600 x 10 x 1000000000) = 5.79 x 10E�?. Then, you can determine whether the corrected error count is proper.

###### Other related questions:
Whether the corrected error count is proper
The corrected error count is expressed in bits, and the board rate is expressed in bit/s. Therefore, the time must be converted into seconds. For example, the rate of an LWF board is 10G bit/s. If the 24-hour error correction count is 5 million, the corresponding BER is calculated as follows: (500 x 10000)/(24 x 3600 x 10 x 1000000000 = 5.79 x 10E-9. In this way, you can ascertain whether the corrected error count is proper.

Method used to determine whether ECC traffic is too heavy
When the network scale is too large, the ECC communication traffic between NEs might be too heavy for the NE processing capability and cause the SCC boards to reset frequently. First, check the network scale. The number of NEs on the network must be less than 100. If the network scale exceeds the number, subnet the ECC network and set up a DCN management channel for each subnet. Second, check the scale of each site. When multiple devices are connected through a hub (or through subrack cascading) to communicate with each other through the extended ECC function of the network ports, the size of the extended ECC network (the total number of servers and clients) cannot be greater than 8. Otherwise, the NE may be reset. When the number of servers and clients is smaller than or equal to 4, either automatic or manual mode can be used. When the number is greater than 4, the manual mode is recommended.

Method used to determine whether a board supports tunable wavelengths
On the NMS, query the manufacturer information of the desired board. If "Tunable" is included in the information, the board supports tunable wavelengths.

Method used to determine whether optical fiber connections are correct between a router and a WDM board on the client-side of WDM equipment
Disable the ALS function for the client-side laser of the WDM board and enable the laser to forcibly emit light. If the optical port on the router receives optical signals, the optical fiber in the transmit direction is correctly connected. Stop the router from emitting light. If the WDM board reports an R_LOS alarm, the optical fiber in the receive direction is correctly connected.

How to determine whether an AP is faulty
Determine whether an AP is faulty using the following methods: 1. Check whether the AP indicators are in normal state. For description of AP indicators, see Indicator Description in the Hardware Installation and Maintenance Guide of an AP. 2. Log in to the AP through the console port, Telnet/STelnet, or the web system, and check whether the login succeeds. Fit APs do not support the web system. - If the login succeeds, the AP works properly. - If the login fails, restore the factory settings of the AP by holding down Default, and then log in to the AP again. If a Fit AP has been added to an AC offline, run the display ap all command on the AC to view the AP state. If the AP state is normal or download but not fault, the AP works properly.

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