CANOGA PERKINS 3240S SNMP Managed Fiber Optic Multiplexer - Manual (Page 13)

3240S F I B E R O P T I C M U L T I P L E X E R
3240S Fiber Optic Multiplexer
1.3.4 -48 Volt DC External Supply
The -48 volt version of the 3240S base unit is intended for use with an external -48VDC power supply. A two piece terminal
block connector is provided in lieu of an AC connector. It is clearly marked as to which screw lug is to be attached to the
positive (+) and negative (-) 48 volts DC.
Check signal ground (Gnd) of the source supply and orientate it to the Multiplexer Gnd, or chassis
ground. Verify with a Digital Multimeter that (+) and (-) are not shorted prior to applying power.
1.3.5 Power Supplies
Your 3240S will employ either a single power supply or a redundant power supply. Redundant power supplies can be either
AC, DC, or both.
1.3.5.1 Single Power Supply
If only one power supply is installed, it is placed in the "B" power supply location. The Power B indicator on the front panel
will illuminate if the supply is properly operating.
1.3.5.2 Redundant Power Supplies
When redundant power supplies are installed in the 3240S,
the supplies are "load sharing" and both the Power A and
Power B LED indicators will be illuminated. Both supplies
provide power to the main board and I/O cards at the same
time. This reduces the operating load on each supply, which
may extend the life of the power supplies. If either of the
supplies fail, the second unit can handle the load for the
entire system and the monitor card will switch the bad sup-
ply out of the circuit. The respective Power A or B Indicator
on the chassis front panel will extinguish and an alarm will
be sent to the network management module, if so equipped.
The Power Monitor Card is situated between the two sup-
plies, is shown in Figure 1-3.
1.3.6 Optical Cable
The 3240S Multiplexer can be used with most standard size fiber: 50-62.5/125 micron multimode fiber optic cable or single
mode 8-10/125 micron fiber if the unit is equipped with laser optics. The optical cable connectors installed on the rear panel
are either ST or FC. The connectors are clearly marked , Tx for transmit which is the output fiber port, or Rx for receive which
is the input fiber port. Tx on the remote unit is linked to Rx on the local unit, and vise versa.
Always cover the cable ends and optical ports with the protective caps whenever the fiber ports are not
in use. Dust and other contaminants may degrade the optical signal.
Figure 1-3
Dual Supplies and Monitor Card
Locations
1-3