The value of this object is the index of the input sub-unit in the prtInputTable in the printer MIB that is the default input tray for this document. An index value of 0 indicates that neither the submitting client, the print server, nor printer has specified a default input tray for this document. The Printer MIB (RFC 1759) requires that input sub-unit indices remain stable across successive device power cycles. ISO DPA: Default-input-tray This attribute identifies an input-tray that the server shall use as the input-tray default for the pages of the document that require a specification. The correspondence between the simple-name of an input-tray (alphanumeric or numeric) and the actual tray in the printer is printer-dependent, and a tray named by such a simple-name may also have an OBJECT IDENTIFIER that names it as well. A server may try to convert a simple-name received from a client to one of the server's OIDs, depending on implementation. However, a server shall always return an input- tray as an OID to the client if the server identifies the input-tray using an OID. Examples: The simple-name strings: envelope, top, 2, or 02, or the OID value: id-val-input-tray-top. If the default-medium attribute is specified (either by the client or by a server default, i.e., the default-medium attribute of the initial-value-job object specified by the logical or physical printer), then the server shall use the default-medium value and shall ignore the default-input-tray attribute, if specified. If the page-media-select attribute is specified (either by the client or by a server default, i.e., the page-media-select attribute of the initial-value-job object specified by the logical or physical printer), then the server shall use the page-media-select value to override the default- input-tray specification on a page by page basis. If the document data, itself, specifies media or input trays, such specification shall override the default-input-tray attribute on a page by page basis. If the document data specifies media or input-trays which are not also values of media-used or input-trays-used, respectively, then a printer may receive a document which requires media or input-trays which are not ready. In such a case, an implementation may either abort the document or try printing the document using some alternative input-tray, such as the default input-tray. The following standard values are defined: top The top input tray in the printer. (id- val-input-tray-top) middle The middle input tray in the printer. (id- val-input-tray-middle) bottom The bottom input tray in the printer. (id- val-input-tray-bottom) envelope The envelope input tray in the printer. (id-val-input-tray-envelope) manual The manual feed input tray in the printer. (id-val-input-tray-manual) large-capacity The large capacity input tray in the printer. (id-val-input-tray-large- capacity) main The main input tray (id-val-input-tray- main) side The side input tray (id-val-input-tray- side)