Specifications

Niagara Release 2.3
Revised: May 22, 2002 Niagara Networking & Connectivity Guide
Chapter 2 Configuration and Troubleshooting Tools
Niagara Configuration Tools
2–14
Wiring a Silver Satin Null Modem Cable—You can make a null modem cable
by attaching the RJ-45 connector upside down on one end, which effectively
connects the input signals on one connector to the output signals of the other.
However, you should wire pins 4 and 5 straight through, which means you need to
actually cross them over in the reversed end (see Table 2-17).
Telnet
Telnet is terminal emulation utility commonly used in IP networking for
command-line access to a variety of hosts.
In the Niagara environment, you can use Telnet to connect to the target shell of a
JACE-4/5 over a LAN (see “About the VxWorks Target Shell”, especially the
Caution). You can then use it to change settings if the Admin Tool is not adequate.
Enabling Telnet
on a JACE-4/5
However, in order to use Telnet, it must first be enabled on the JACE-4/5. This
involves editing the system.properties file, which is one of a number of configuration
files used by Niagara hosts. Use the following procedure to enable Telnet on the
JACE-4/5.
Caution Enabling Telnet on a JACE creates a greater security risk since Telnet is a
utility available on most operating systems. There is a greater risk that
someone could access the host with Telnet, rather than with our Admin Tool,
which has a restricted installation.
Procedure 2-7 Enabling Telnet on the JACE-4/5.
Step 1 Start the Admin Tool (see steps 1—5 of “Starting the Admin Tool and accessing
network settings.”).
Step 2 From the menu choose Host > Edit System Properties.
The system.properties file opens in a text editor window.
Step 3 Add a new empty line to the bottom of the file by placing your cursor at the end of
the last text line and pressing ENTER.
Table 2-17 Silver satin null modem cable pinouts.
Connector #1
Cable Lines
Connector #2
RJ-45 Pin Signal Signal RJ-45 Pin
1 RTS ----------------------- CTS 8
2 DTR ---------------------- DSR 7
3 TXD ---------------------- RXD 6
4 GND DCD (not used) 5
5 DCD (not used) GND 4
6 RXD ---------------------- TXD 3
7 DSR ---------------------- DTR 2
8 CTS ---------------------- RTS 1