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? Specification Application Principles

Huawei products are manufactured based on the following standards and

documents, which are sorted by priority: Huawei drawings, Huawei enterprise standards, generic telecommunication equipment standards, and national standards of China. If there is any discrepancy between this document and Huawei drawings, the drawing shall prevail. Among Huawei enterprise technical standards, dedicated standards take precedence over generic standards.

? Drawing Frame Description

There were three kinds of drawing frames in huawei drawings, they are part

drawings frame (figure 1), assembly drawing frame(figure 2) and BOM bill frame(figure 3). A Huawei part drawing frame consists of a title bar, change description bar and

drawing status bar. An assembly drawing frame more than part drawing frame a details bar .BOM bill frame is consists of a title bar, change description bar and header field. Only assemble like DKBA4.XXX.XXXX has the BOM bill. The table 1 is descrambles in a drawing frame

Change description bar Drawing status bar Title bar

? Part Drawings Frame Details bar

Drawing status bar Title bar

Change description bar

? Assemble Drawing Frame

Drawing status bar Title bar

? BOM Bill Frame

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Describes in a drawing box.

Area Code Description View projection Name Drawing number Remarks First-angle projection is used in Huawei drawings. N/A DKBA4.XXX.XXXX indicates an assembly diagram. DKBA6.XXX.XXXX indicates a component diagram. DKBA8.XXX.XXXX indicates a part diagram. DKBA4.XXX.XXXXMX indicates a part list. TITLE DWG NO. Title bar PART NO. Material number N/A UNIT'S FINISH MSSS(Kg) Measurement unit Surface processing code Component and part weight and quantity N/A Reference to section 5 of this specification N/A SCALE PRODUCT SHEET Drawing scale Product name Page N/A The product which first used this part The number in front of OF is the current page number, and the number after OF is the total number of pages. N/A Reference to section 4 of this specification N/A N/A N/A N/A Release: officially archived drawing Prototype: temporarily archived drawing N/A N/A N/A Filled with REPLACE by default. For details about changed descriptions, see the attachment. REV MAT'L DRAW CHKD STAD APPD Drawing status bar FILE NAME REV Change Description bar DESCRIPTION ECA NO. RELEASE LEVEL Product version Name of part materials Designer Reviewer Standardization reviewer Approver Drawing status Document name Drawing change version Drawing change number Change description ? Marked Description of Dimensions

?

Drawing description

Unless otherwise stated, the dimensions and tolerance in the drawings are the final dimensions and tolerance for spare parts or assemblies.Dimensions with are key dimensions, and they should be well ensured during manufacturing. For dimensions only signed with , their tolerance takes the default tolerance, sheet-metal parts refer to DKBA0.450.0040Specification For Sheet-metal Punching Part, and diecasting and

maching parts refer to DKBA0.400.0178 Tolerance Technical Specification of Die casting and Machining Parts,plastic and rubber parts refer to DKBA0.400.0193 General Quality