3.4 Powering the DFG48000 Managed Fiber Switch
The DFG48000 Switches incorporate an internal universal power supply and have a recessed male
IEC connector for the AC power cord at the left-rear. A manual power ON-OFF switch is adjacent. A
six-foot 115 VAC 60 Hz standard power cord is supplied with each unit shipped within the United
States and Canada. The auto-ranging power supply supports installation environments where the
AC voltage is from 100 to 240 volts with a power input frequency between 47 and 63 Hz. The 25-
port units will consume over 20 watts of power typically. When connecting the Ethernet cabling,
there is no need to power down the unit. Individual segments can be connected or disconnected
without concern for AC power-related problems or damage to the unit.
3.4.1 Alarm Contacts for monitoring internal power, and Software Traps
The Alarm Contacts feature, optional on DFG48000’s, provides two Form C Normally Closed (NC)
contacts to which the user can attach two sets of status monitoring wires at the green terminal
block. When this option is present, the terminal block for Alarm Contacts is part of the Power Input
panel in the DFG48000 case. The AC or DC power input connection is in the same panel. A manual
On-Off Switch for power to the unit is not available on DFG48000 units with the Alarm Contacts
option, as these two features occupy the same space in the case. The first NC Alarm Contact (top
position) is a “Software Alarm”, operated by user settings in the DFG48000 software. The user can
disable the Software Alarm feature with a software configuration command if desired. When the
Software Alarm is enabled, the Form C Normally Closed (NC) contact is held close during normal
software operation. A user-defined software malfunction, such as an SNMP Trap or a Software
Security violation or an S-Ring Fault, causes the contact to open and thus trigger an alarm in the
user’s monitoring system The second (bottom position) NC Alarm Contact is held close when there
is power on the main board inside of the DFG48000. This provides a “Hardware Alarm” because
the NC contacts will open when internal power is lost, either from an external power down condition
or by the failure of the power supply inside of the DFG48000 Switch. Useful info. About Alarm
contacts:
1. There is four terminal block (1, 2, 3, 4) provided next to AC/DC power supply
2. The top two pins (1, 2) are software operated
3. The bottom two pins (3, 4) are hardware operated
4. By default it is NC (normally closed)
5. The software operation needs to be enable and set to get the Alarm traps. For detail information
about the Software Alarm and software control of SNMP alarm traps, please reference the
DFG48000 Software User Manual.
3.5 DFG480XX (Port Module) Card Installation
The DFG48000 Switches are normally received from the factory with all required DFG480XX
modules installed. There may be situations where DFG480XX cards need to be added or replaced.
In cases where additional cards are needed, the faceplate for an available front-mounted slot must
be removed. The following procedure describes this operation.