IPDS printing environment5-6 System Overview Guide• OL1: Overlay One• PS1: Page Segment One• Line mode data streamsEach of the data objects follow the same object rule of containingdelimiting fields with structured fields describing each object.Software features for IPDSThis section describes some of the software features for IPDSprinting.IOCA Replicate and TrimThe printer supports Replicate and Trim, which improves theprocessing of IM and IO images that contain large areas ofshaded graphics. (IM images are resolution-dependent imagesthat cannot be compressed or scaled; IO images are resolution-independent.)The IOCA Replicate and Trim capability allows for fastertransmission to the printer of AFP applications with IM imagesthat have large or widespread shaded areas. It also reduces thestorage area required on the host and on the printer.Trace facilityTo help diagnose problems, the system provides a tracemechanism. Trace files store system configuration information,maintain TCP/IP protocol headers, and time-stamp all records.For detailed information on this feature, refer to the “Using utilitycommands” chapter in the Guide to Configuring and Managingthe System.Overstrike, underscore, subscript, and superscriptSupport for the PT2 Subset of PTOCA enables the printer toprint overstrikes, underscores, subscripts, and superscriptswhere specified in jobs.