LPS CONNECTIONS
It is possible for a network connection to the 4890 to use more
than one communication module. For example, the Shiva
FASTPATH communication module converts AppleTalk protocol
on an AppleTalk network to TCP/IP on Ethernet. A second
communication module is required to convert TCP/IP to XNS.
Data streams required by the printer
As previously mentioned, the 4890 LPS supports three data
streams: line printer, Line Conditioned Data Set (LCDS), and
Interpress. All other data streams require conversion.
The type of data stream sent to the 4890 printer depends upon
the application software being run on the platforms connected to
the printer.
Conversion of PostScript data streams
Front end
A large number of the document creation applications available
for 4890 environments (particularly workstation environments)
produce PostScript data streams. These must be converted to a
format that is acceptable to the printer. Conversion of PostScript
data streams is done by a front end processor.
The Entire FIBRE 400/600 front end
The Entire FIBRE front end converts PostScript data streams to
Xerox .IMG files. The software for FIBRE runs on a Sun
SPARCstation 1+ (FIBRE 400) or SPARCstation 2 (FIBRE 600)
workstation, running SUN OS 4.1 (a UNIX-based operating
system).
FIBRE 400/600 accepts full color input and converts it to highlight
color output for printing on the 4890 LPS. This is done by
converting each page of PostScript data to a pair of .IMG files
(one for black, one for highlight color). The pair of .IMG files is
stored on the printer, then printed with an Interpress print job
that overprints the two files.
XEROX 4890 HIGHLIGHT COLOR LPS PRODUCT REFERENCE
4-11
