Identifies the CLEI code number of the equipment. The CLEI code is a 10-character code that identifies communications equipment. It describes product type, features, source document, and associated drawings and vintages. CLEI codes have 4 data elements: - Characters 1 to 4: Define family or subfamily of product. - Characters 5 to 7: Define features. - Character 8: Manufacturer and System ID. - Characters 9 and 10: Identifies version, issue, and release #.