The SN is a string of 20 digits or letters. The meanings of the fields are as follows:
SN= category code (2 digits) +P/N (8 digits) +EMS code (2 digits) + year (1 digit) + month (1 digit) + serial number (6 digits)
---- category code (2 digits): 21 indicates the bar code of the component module.
----P/N (8 digits): Use the material item ID of the Huawei BOM system.
----EMS code (2 digits): Identifier code used to distinguish the identities of different vendors;
---- year (1 digit): Product production year, which is the last digit of the year, for example, 4 in 2004. Since 2010, 26 letters are used to indicate the year. "A" indicates 2010, "A" ~ "Z" indicates the subsequent years of 2010.
---- month (1 digit): Product production month. The value 1 to 9 indicates from January to September. A,B,C is used indicate October, November, and December respectively.
---- Serial number (6 digits): The value ranges from 000001 to 999999.
For example
<Huawei> display esn
ESN of device: 2102113374P0F4000046
F4 indicates that the production date of this component is April 2015.
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