This is a sample "Read_Me" text file sent to the board manufacturer with the various Gerber files and drill files in an effort to prevent any misunderstandings.  This particular file was part of the zipped package for the manufacture of PCB 106AC-1d, and was named "Read_Me_106AC-1d.txt" (cleverly enough).  This is a very simple version of such a text file, and a great deal more information may be required for more complex PCBs.

106AC-1d

Order Information:
  Date Ordered:           April 17, 2010
  Number of Pieces:       30 Count
  Lead Time Requested:    8 Days
  PCB Identifying Marks:  106AC-1d
  Units of Measure:       Inches / Mils (.001 Inch)
  Changes / Alterations:  Changes Must Be Approved

PCB Specifications:
  Size (Each):    0.8 x 2.3 Inches (20.32 x 58.42 mm)
  Layers:         Double Sided
  Laminate:       TG-170 or Higher FR-4
  Thickness:     .062 / .063 Inch (1.6 mm)
  Copper Weight:  One Ounce (35 �m)

PCB Finish:
  Finish:         ENIG*******BOTH Sides
  Solder Mask:    BLUE LPI***BOTH Sides
  Silk Screen:    WHITE******BOTH Sides

Traces / Pads / Holes Data:
  Minimum Copper to Board Edge Clearance: .008 Inch
  Minimum Trace Width:  .010 Inch
  Minimum Annular Ring: .012 (Restring)
  Number of Pads:         61
  Number of Vias:          0
  Number of SMDs:          6
     SMDs in Top:          4
     SMDs in Bot:          2
  Number of Holes (NPTH):  0
  Total Number of Drills: 61
  Different Drill Sizes:   5
  Smallest Drill Size:  .025 Inch
Drilling Diameters Specified After Plating (PTH Barrel ID)

Stackup / Gerber RS-274X File Extension Key:
  Stackup: .plc - .stc - .cmp - .sol - .sts - .pls  (.dim and .drd)
Extension        Description                 Eagle Layers Used
  .plc  -  Top Silk Screen Legend            21-tPlace
  .stc  -  Top Solder Mask Stop              29-tStop
  .cmp  -  Top Copper / Component Side        1-Top/17-Pads/18-Vias
  .sol  -  Bottom Copper / Solder Side       16-Bot/17-Pads/18-Vias
  .sts  -  Bottom Solder Mask Stop           30-bStop
  .pls  -  Bottom Silk Screen Legend         22-bPlace
  .dim  -  Dimensions / PCB Outline          20-Dimension
  .drd  -  Plated-Thru Drillings (Excellon)  44-Drills/[45-Holes]
* .hol  -  Unplated Drillings (Excellon)*   [45-Holes]
* .mill -  Milling*                          46-Milling
  .info -  Information Files (May Disregard)
  .brd  -  Eagle Board File for Reference
  .txt  -  This Text File               
                         *Not Used if Absent*
Contact Information:
  Syd H. Levine
  AnaLog Services, Inc.
  Phone:   
  Telefax:
  E-mail: 
  Web URL:

Shipping or Mailing Address:
  Syd H. Levine
  AnaLog Services, Inc.
 
  Reynolds Station, KY  42368

05-01-10
Last 05-20-10