User`s guide

When connecting to the NPS unit via network, modem or console port, the following factors should be kept in mind:
One Connection at a Time: Only one port can access the command mode at a time. When a command port is
busy, the NPS will react as follows:
Network Port Busy: If a second user attempts to connect via the Modem Port, the NPS will send a
message which reads "NPS is Busy, Session in Progress". If a second user attempts to connect via the
Console Port, the port will not wake.
.
Modem Port Busy: If a second user attempts to connect via the Network Port, the connection will be
refused. If a second user attempts to connect via the Console Port, the port will not wake.
b.
Console Port Busy: If a second user attempts to connect via the Network Port, the connection will be
refused. If a second user attempts to connect via the Modem Port, the Console Port will disconnect and the
Modem Port will be granted access; the Modem Port has priority over the Console Port.
c.
1.
Ping Packet Size: The NPS will not accept Ping Packets larger than approximately 1000 bytes.2.
Net Card Reset Cycle: If the NPS is pinged at the precise moment when the network card is being reset, Ping
Packets will not be returned. Therefore, if the NPS unit is continually pinged, you will occasionally see missing
packets. In most cases, this does not indicate a problem with the unit.
3.
Timeout Values: The Disconnect Timeout (General Parameters, Item 7) should be set at approximately the same
value as your ARP timeout. If the NPS timeout period is longer than the ARP timeout, this can create a problem.
Example: Assume that the ARP timeout is 2 minutes and the NPS Disconnect Timeout is 60 minutes. If the ARP
entry times out after two minutes of inactivity, you will not be able to reconnect to the NPS until its 60 minute
timeout has elapsed.
4.
If you have any questions regarding configuration or operation of the NPS unit, please contact WTI Technical Support as
described in Appendix C.
A. Interface Descriptions
A.1. Console Port Interface
Figure A.1: Console Port Interface
NPS Series Network Power Switch -- User's Guide
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