Finish refreshing DCIM models documentation

docs/models/dcim/rack.md

@@ -1,12 +1,51 @@
 # Racks
 
-The rack model represents a physical two- or four-post equipment rack in which devices can be installed. Each rack must be assigned to a site, and may optionally be assigned to a location and/or tenant. Racks can also be organized by user-defined functional roles. The name and facility ID of each rack within a location must be unique.
+The rack model represents a physical two- or four-post equipment rack in which [devices](./device.md) can be installed. Each rack must be assigned to a [site](./site.md), and may optionally be assigned to a [location](./location.md) within that site. Racks can also be organized by user-defined functional roles. The name and facility ID of each rack within a location must be unique.
 
 Rack height is measured in *rack units* (U); racks are commonly between 42U and 48U tall, but NetBox allows you to define racks of arbitrary height. A toggle is provided to indicate whether rack units are in ascending (from the ground up) or descending order.
 
 Each rack is assigned a name and (optionally) a separate facility ID. This is helpful when leasing space in a data center your organization does not own: The facility will often assign a seemingly arbitrary ID to a rack (for example, "M204.313") whereas internally you refer to is simply as "R113." A unique serial number and asset tag may also be associated with each rack.
 
-A rack must be designated as one of the following types:
+## Fields
+
+### Site
+
+The [site](./site.md) to which the rack is assigned.
+
+### Location
+
+The [location](./location.md) within a site where the rack has been installed (optional).
+
+### Name
+
+The rack's name or identifier. Must be unique to the rack's location, if assigned.
+
+### Status
+
+Operational status.
+
+!!! tip
+    Additional statuses may be defined by setting `Rack.status` under the [`FIELD_CHOICES`](../../configuration/data-validation.md#field_choices) configuration parameter.
+
+### Role
+
+The functional [role](./rackrole.md) fulfilled by the rack.
+
+### Facility ID
+
+An alternative identifier assigned to the rack e.g. by the facility operator. This is helpful for tracking datacenter rack designations in a colocation facility.
+
+### Serial Number
+
+The unique physical serial number assigned to this rack.
+
+### Asset Tag
+
+A unique, locally-administered label used to identify hardware resources.
+
+### Type
+
+A rack can be designated as one of the following types:
 
 * 2-post frame
 * 4-post frame
@@ -14,12 +53,18 @@ A rack must be designated as one of the following types:
 * Wall-mounted frame
 * Wall-mounted cabinet
 
-Similarly, each rack must be assigned an operational status, which is one of the following:
+### Width
 
-* Reserved
-* Available
-* Planned
-* Active
-* Deprecated
+The canonical distance between the two vertical rails on a face. (This is typically 19 inches, however other standard widths exist.)
 
-Each rack has two faces (front and rear) on which devices can be mounted. Rail-to-rail width may be 10, 19, 21, or 23 inches. The outer width and depth of a rack or cabinet can also be annotated in millimeters or inches.
+### Height
+
+The height of the rack, measured in units.
+
+### Outer Dimensions
+
+The external width and depth of the rack can be tracked to aid in floorplan calculations. These measurements must be designated in either millimeters or inches.
+
+### Descending Units
+
+If selected, the rack's elevation will display unit 1 at the top of the rack. (Most racks use asceneding numbering, with unit 1 assigned to the bottommost position.)