DPS Telecom D-PK-C16V2, Руководство пользователя

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Frequently Asked Questions
17
Here are answers to some common questions from NetGuardian users. The latest FAQs can be found on the
NetGuardian support web page,
http://www.dpstele.com.
If you have a question about the NetGuardian, please call us at (559) 454-1600 or e-mail us at support@dpstele.
com .
General FAQs 17.1
Q. How do I telnet to the NetGuardian?
A.
You must use Port 2002 to connect to the NetGuardian. Configure your Telnet client to connect using TCP/IP (
not "Telnet," or any other port options). For connection information, enter the IP address of the NetGuardian and
Port 2002. For example, to connect to the NetGuardian using the standard Windows Telnet client, click Start,
click Run, and type "telnet <NetGuardian IP address> 2002."
Q. How do I connect my NetGuardian to the LAN?
A.
To connect your NetGuardian to your LAN, you need to configure the unit IP address, the subnet mask and the
default gateway. A sample configuration could look like this:
Unit Address: 192.168.1.100
subnet mask: 255.255.255.0
Default Gateway: 192.168.1.1
Save your changes by writing to NVRAM and reboot. Any change to the unit's IP configuration requires a reboot.
Q. When I connect to the NetGuardian through the craft port on the front panel it either doesn't work
right or it doesn't work at all. What's going on?
A. Make sure your using the right COM port settings. Your COM port settings should read:
Bits per second: 9600 (9600 baud)
Data bits: 8
Parity: None
Stop bits: 1
Flow control: None
Important! Flow control must be set to none . Flow control normally defaults to hardware in most terminal
programs, and this will not work correctly with the NetGuardian.
Q. The LAN link LED is green on my NetGuardian, but I can't poll it from my T/Mon.
A.
Some routers will not forward packets to an IP address until the MAC address of the destination device has
been registered on the router's Address Resolution Protocol (ARP) table. Enter the IP address of your gateway
and your T/Mon system to the ARP table.
Q. What characteristics of an alarm point can be configured through software? For instance, can point 4
be used to sense an active-low signal, or point 5 to sense a level or an edge?
A. The unit's standard configuration is for all alarm points to be level-sensed. You cannot use configuration
software to convert alarm points to TTL (edge-sensed) operation. TTL alarm points are a hardware option that
must be specified when you order your NetGuardian. Ordering TTL points for your NetGuardian does not add to
the cost of the unit What you can do with the configuration software is change any alarm point from "Normal" to
"Reversed" operation. Switching to Reversed operation has different effects, depending on the kind of input
connected to the alarm point:
·
If the alarm input generates an active-high signal, switching to Reversed operation means the
NetGuardian will declare an alarm in the absence of the active-high signal, creating the practical equivalent of an
active-low alarm.
If the alarm input generates an active-low signal, switching to Reversed operation means the
NetGuardian will declare an alarm in the absence of the active-low signal, creating the practical equivalent of
an active-high alarm.