LPS CONNECTIONS
Communication protocols
The 4890 does not accept input directly from an AppleTalk
network. AppleTalk must first be converted to Ethernet, so a
communication module such as Shiva’s FASTPATH is necessary.
FASTPATH converts AppleTalk communication protocols into
TCP/IP protocol on Ethernet. The TCP/IP print jobs can then be
converted into XNS print jobs by a front end.
Data streams
Macintosh application software that produces output for printing
produces PostScript data streams. The front end converts the
PostScript output to Xerox .IMG files that can be read by the
printer.
Color specification
PostScript masters may contain full color specifications, in which
case full color to highlight color mapping is required. The front
end performs the color mapping automatically when it converts
PostScript data to .IMG files. If exact printer colors are specified
through the use of a facsimile palette, then the colors print
exactly as specified.
Figure 4-16.
Macintosh AppleTalk network interface
Communication
module (Shiva
FASTPATH)
AppleTalk LAN
4890 HighLight Color
LPS
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Ethernet interface
It is possible to connect a Macintosh to a 4890 through an
Ethernet LAN. Each Macintosh connected to the network must
have its own Ethernet card. One or a few Ethernet cards are less
expensive than the communication module needed to convert
AppleTalk to Ethernet, but if you have several Macintosh PCs that
need to communicate directly with the printer it may be more
cost effective to use the AppleTalk Plus communication module
configuration.
You can use an Ethernet configuration to restrict printer
accessibility to a small number of Macintosh PCs at your facility
simply by installing Ethernet cards in only those few PCs you wish
to have connected to the printer.
XEROX 4890 HIGHLIGHT COLOR LPS PRODUCT REFERENCE
4-21
