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7UPS Network Management Card 2 User’s Guide
Link-RX/TX (10/100) LED
This LED indicates the network status of the Management Card.
Watchdog Features
Overview
To detect internal problems and recover from unanticipated inputs, the Management Card uses internal,
system-wide watchdog mechanisms. When it restarts to recover from an internal problem, a System:
Warmstart event is recorded in the event log.
Network interface watchdog mechanism
The Management Card implements internal watchdog mechanisms to protect itself from becoming
inaccessible over the network. For example, if the Management Card does not receive any network
traffic for 9.5 minutes (either direct traffic, such as SNMP, or broadcast traffic, such as an Address
Resolution Protocol [ARP] request), it assumes that there is a problem with its network interface and
restarts.
Resetting the network timer
To ensure that the Management Card does not restart if the network is quiet for 9.5 minutes, the
Management Card attempts to contact the default gateway every 4.5 minutes. If the gateway is present, it
responds to the Management Card, and that response restarts the 9.5-minute timer. If your application
does not require or have a gateway, specify the IP address of a computer that is running on the network
and is on the same subnet. The network traffic of that computer will restart the 9.5-minute timer
frequently enough to prevent the Management Card from restarting.
Condition Description
Off One or more of the following situations exist:
• The Management Card is not receiving input power.
• The cable that connects the Management Card to the network is disconnected or
defective.
• The device that connects the Management Card to the network is turned off or not
operating correctly.
• The Management Card itself is not operating properly. It may need to be repaired or
replaced. Contact APC Customer Support. See “APC Worldwide Customer
Support” on page 108.
Solid green The Management Card is connected to a network operating at 10 Megabits per
second (Mbps).
Solid orange The Management Card is connected to a network operating at 100 Mbps.
Flashing green The Management Card is receiving or transmitting data packets at 10 Mbps.
Flashing orange The Management Card is receiving or transmitting data packets at 100 Mbps.