77
·
If the alarm input generates an active-high signal,
switching to Reversed operation means
the E1 WAN Mux 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
E1 WAN Mux will declare an alarm in the absence of the active-low signal, creating the practical
equivalent of an active-high alarm.
·
If the alarm input is normally open,
switching to Reversed operation converts it to a normally
closed alarm point.
·
If the alarm input is normally closed,
switching to Reversed operation converts it to a normally
open alarm point.
Q. I'm unsure if the voltage of my power supply is within the specified range. How do I test the
voltage?
A.
Connect the black common lead of a voltmeter to the ground terminal of the battery. Connect the red
lead of the voltmeter to the batter's VCD terminal. The voltmeter should read between -36 and -
72VDC.
SNMP FAQs
16.2
Q. Which version of SNMP is supported by the SNMP agent on the NetGuardian?
A.
SNMP v1 and SNMPv2c.
Q. Does the NetGuardian 16A support MIB-2 and/or any other standard MIBs?
A.
The NetGuardian 16A supports the bulk of MIB-2.
Q. Does the NetGuardian 16A SNMP agent support both NetGuardian 16A and T/MonXM
variables?
A.
The NetGuardian 16A SNMP agent manages an embedded MIB that supports only the NetGuardian
16A's RTU variables. The T/MonXM variables are included in the distributed MIB only to provide
SNMP managers with a single MIB for all DPS Telecom products.
Q. How many traps are triggered when a single point is set or cleared? The MIB defines traps
like "major alarm set/cleared," "RTU point set," and a lot of granular traps, which could imply
that more than one trap is sent when a change of state occurs on one point.
A.
Generally, a single change of state generates a single trap.
Q. What does "point map" mean?
A.
A point map is a single MIB leaf that presents the current status of a 64-alarm-point display in an
ASCII-readable form, where a "." represents a clear and an "x" represents an alarm.
Q. The NetGuardian 16A manual talks about control relay outputs. How do I control these from
my SNMP manager?
A.
The control relays are operated by issuing the appropriate set commands, which are contained in
the DPS Telecom MIB.
Q. How can I associate descriptive information with a point for the RTU granular traps?
A.
The NetGuardian 16A alarm point descriptions are individually defined using the Web Browser.
Q. My SNMP traps aren't getting through. What should I try?
A.
Try these three steps:
1. Make sure that the Trap Address (IP address of the SNMP manager) is defined. (If you changed
the Trap Address, make sure you saved the change to NVRAM and rebooted.)
