In a previous job I used to work as a CAD operator, a few years later when I was working in broadcast enginneering I was looking at creating some more standard Autocad templates and blocks for broadcast drawings. Ive never really got around to it, each time I do a drawing I just modify an old one from an existing template a colleague of mine made.
So ive decided to get back on it and create myself a better, more automated workflow.
One of the first things I was looking at is how to standardise layers. A few google searches later I found that the AIA (American Institute of Architects) had a system that seemed perfect (AIA CAD Layer Guidelines). With a few modifications I came up with the following….
themoog’s layering standards for broadcast Autocad drawings
As recommend by the 1997 AIA CAD layer Guidelines, layer names may be as short as six characters (discipline code + major group) or as long as sixteen characters (discipline code + major group + minor group + status). See bellow for examples.
|B-VID||= discipline code + major code|
|B-VID-SDI||= discipline code + major code + minor code|
|B-VID-EXST||= discipline code + status code|
|B-VID-SDI-EXST||= disincline code + major code +minor code + status code|
The discipline code is a two character field with either a hyphen or user defined modifier.
The major group filed is a four character field that identifies the system such as VIDEO, AUDIO etc…. Although most major groups are logically associated with specific discipline codes, it is possible to combine major group codes with any of the discipline codes. For example, B-VID, T-VID
This is an optional four character field for further differentiation of major groups fro example, B-VID-SDI, B-VID-CVBS
|SDI||serial digital video|
|CVBS||composite video burst and sync|
|ABAL||analog balanced audio|
The status field is an optional four character designator that differentiates new builds from remodeling and changes. For example B-VID-SDI-EXST
|EXST||existing to remain|
|DEMO||existing to demolish|
|MOVE||items to be moved|
|NICN||not in contract|
|*-ANNO-LEGN||legends and schedules|
|*-ANNO-NPLT||non-plot info e.g. viewports|
|*-ANNO-TTLB||title blocks and sheet borders|
As a general rule for all projects, drawing entities should assume the colour of the layer in which they reside. This means all colours are applied by ‘layer’ not ‘entity’
|B-AUD-ABAL||Analog balanced Audio||5-blue||continuous|
|B-AUD-AUB||Analog Unbalanced Audio||5-blue||continuous|
BTW, if anyone has any better solutions i’m still happy to hear, also I really want to know if anyone has any good cable numbering systems!