xStack
®
DGS-3120 Series Layer 2 Managed Stackable Gigabit Switch Hardware Installation Guide
13
Connecting DC Power to the DGS-3120-24SC-DC
Follow the instructions below to connect the DC power supply of the DGS-3120-24SC-DC to the DC power source.
Figure 2- 4. Close-up view of Power Receptacle
1. The DC power supply has a three-terminal wiring block consisting of a positive (+), a negative (-) and a safety
ground terminal.
2. Firmly attach the DC power to the negative and positive contacts on the wiring assembly.
a. The negative pole (-) connects to the
-48V
contact.
b. The positive pole (+) connects to the
-48V Return
contact.
c. If available, an earth ground may be connected to the center contact post.
3. Tighten the contact screws to secure the connection.
NOTE
: Use a minimum 18 gauge (AWG) wire. All power connection wiring should conform to the
rules and regulations in the National Electrical Code (NEC), as well as any local codes. A branch
circuit over current protection must be rated between 2A to 10A.
CAUTION
: This equipment must be grounded.
CAUTION
: This equipment must be installed and maintained by qualified service personnel only.
Installing SFP Ports
The Switch is equipped with SFP (Small Form Factor Portable) ports, which are to be used with fiber-optical
transceiver cabling in order to uplink various other networking devices for a Gigabit link that may span great distances.
These SFP ports support full-duplex transmissions, have auto-negotiation and can be used with DEM-310GT
(1000BASE-LX), DEM-311GT (1000BASE-SX), DEM-312GT2 (1000BASE-SX), DEM-314GT (1000BASE-LH), DEM-
315GT (1000BASE-ZX), and DGS-712 (1G Copper, 1000BASE-T) transceivers. See the figure below for installing the
SFP ports in the Switch. In addition, DEM-210 (Single Mode, 100BASE-FX) and DEM-211 (Multi Mode, 100BASE-FX)
SFP transceivers are supported. WDM transceivers supported include DEM-330T (TX-1550/RX-1310 nm), DEM-330R
(TX-1310/RX-1550 nm), DEM-331T (TX-1550/RX-1310 nm), DEM-331R (TX1310/RX-1550 nm), DEM-220T
(100BASE-BX-D, TX-1550/RX-1310 nm), and DEM-220R (100BASE-BX-U, TX-1310/RX-1550 nm).
