GarrettCom Quad - Manual (Page 52)

Magnum Quad-Series Fiber Switches Installation and User Guide (06/09)
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Input Voltage: 36 - 70 VDC
Power Supply (Internal 24 VDC Option)
DC Power Connector: 3 terminals: “ - “, “GND”, “+”
Input Voltage: 20-36 VDC
Power Supply (Internal 125 or 100VDC Option)
DC Power Connector: 3 terminals: “ - “, “GND”, “+”
Input Voltage: “125” = 120 - 160 VDC range, “100” = 90 to 160VDC range
Surge Suppression: Varistors are installed inside to avoid QS internal damage from
power spikes or excess outside electrical noise coming in on the DC power input lines
Power Consumption: all DC Model QS5108, QS5116: 30 watt typical,50 watts max.
With the exception of the power supply, all specifications and functions of
Magnum Quad-Series Switches-48VDC, 24VDC, 100VDC and 125VDC models are
identical to those listed in the main manual.
B2.0 -48VDC, 24, 100, and 125VDC POWER OPTION, THEORY OF OPERATION
The -48VDC, 24, 100 and 125VDC power options are designed using diodes
inside on each DC power input line behind the two external power connection terminals,
so that the power from an external source can
only flow into the unit. This allows the Quad-
Series Switches to operate only whenever DC
power is correctly applied to the two inputs.
It protects the Quad-Series Switches from
incorrect DC input connections. An incorrect
polarity connection, for example, will neither affect the Quad-Series Switches, its
internal power supply, nor will it blow the fuse in the internal power supply.
The manual power “On-Off” Switch (optional) is used for powering the unit on
and off when it is placed into or taken out of service.
B3.0 APPLICATIONS FOR DC POWERED ETHERNET SWITCHES
Magnum Quad-Series Switches are easily installed in a variety of applications
where -48VDC, 24, 100 or 125VDC power is used as the primary power source. The DC
power configurationcapability provides an Ethernet networking solution utilizing a
special power supply in switches with a proven track record.
The –48VDC solution is particularly useful in the telecommunication industry,
where it is common for facilities to operate on -48VDC power. Such companies include
regular and wireless telephone service providers, Internet Service Providers (ISPs) and
other communication companies. In addition, many high availability equipment services,
such as broadcasters, publishers, newspaper operations, brokerage firms and other
facilities often use a battery backup system to maintain operations in the event of a power
failure. It is also frequently used for computer system backup, management and
operations monitoring equipment.
The 24, 100 and 125VDC options are particularly useful in the Industrial environment,
where it is common for facilities to operate on 24VDC or 125VDC power. The 100 and
A+
A-
GND
GND CHASSIS
FUSE
+
-
SUPPLY
HUB
POWER SWITCH