Digital Equipment RapidPrint 500, Reference Manual

Page: 106 / 192

Reverse Telnet (RTEL) UNIX Host Setup
10 - 10
10.3.1 Components of RTEL
RTEL provides two main types of interfaces to the server. The first is a printer backend filter for
BSD, SYSV, and AIX type printing subsystems. The second method of printing with RTEL uses a
UNIX named pipe as the actual interface to the host system.
The backend filter simply accepts data from the queue manager (LPD for BSD, lpsched for SYSV,
and qdaemon on AIX) and moves that data over the network to the terminal/print server. The
backend filter can perform simple reformatting of the job, such as tab expansion, <CR> to <CR>
<LF> expansion, and banner pages. It cannot, however, perform complicated tasks such as Post-
Script conversion. See the RTEL-backend man page for more information.
The named pipe interface allows host-supplied or third party software to send output to a device
(the pipe) after which the RTELPD daemon process sends the data to the server. See the RTELPD
man page for more information.
10.3.2 Installing Reverse Telnet Software
Installing the RTEL software is a fairly simple process. The first step is getting the software onto
the target machine. The software will be provided on the distribution CD-ROM in tar format and
can be restored into a local directory. Set your current directory to the RTEL directory.
Figure 10-18: Restoring RTEL software
NOTE: The word “cdrom” in the example above should be replaced with the name of the
current distribution CD-ROM.
For MS-DOS, the source code will be in a single tar archive file (rtel_src.tar). This file contains all of
the source code, but does not contain any executables. Simply copy the tar archive file onto the
host system, remembering to use binary mode during the copy, and untar it. Since the rtel_src.tar
file does not contain any executables, it will be necessary to recompile the software on the target
machine.This will be done automatically for supported systems.
Once all the files are in place, issue the command ./lpinstall. The results are shown in Figure 10-19.
# mkdir /tmp/rtel
# cd /tmp/rtel
# tar xvf / cdrom/products/servers/rtelv4_2_2/rtel_src.tar