User guide

When to Change Part Numbers
E-6: Parts and Part Numbers
Revisions are distinguished by whether they are
major
or
minor
. See
Part
Numbers
on page E-1 for how these are expressed in the various numbering
schemes in use at Bay Networks.
When to Pull a New Number
You need a new part number:
• For any custom component whenever there is a plan to diverge in a product’s
application, regardless of whether your pre-released product reports into
single or multiple objects or products.
• For programmed parts, if there is a change in the raw device for functional
reasons, or if the part comes in a different physical package.
• For PCB assemblies that report into multiple products, whenever any form or
function change cannot be used in all the applications.
When to Change the Embedded Rev for a Part Number
The instructions in this section tell you when you should run Part Manager to
update the
embedded rev
portion of a part number. For common part numbers, this
refers to the -A, -B, and so on portion of the number. You can also request an
update for legacy numbers for custom-made parts.
See
When to Update the Minor Rev of a Part Number
on page E-7 for information
about minor revision changes that do not affect the part number itself but do affect
the revision level as stored in the SAP database: these revs are a natural product of
PCNs.
Programmed Parts
A major revision change is necessary:
• For single-product reporting, if the raw device changes for functional reasons,
or comes in a
different physical package
, or you need to use old and new parts
at the same time in production.
• For multiple-product reporting, if different products phase-in at different
times any of the minor revision changes noted above.