the DIP-switch should be set to the
Up “MAN” position. When in manual
mode, no capabilities are advertised
and the port operates in full-duplex
mode.
NOTE: If the UTP port is configured
for MAN, the port is configured for
100Mbps full-duplex.
Figure 2: DIP-switch Location
SW4 and SW5: SFP Port Redundancy
SW4 and SW5 control the port redundancy mode of the 3-Port GM4 module. When SW5 is
in the “Normal” (default) position, the SFP ports operate in a non-redundant (independent)
mode. When SW5 is in the “1:1” position, the redundancy mode is based on the position of
SW4. See figure 3 below for more information.
Switch 4
Switch 5
Function
RTP (Down)
Normal (Down)
Non-redundant mode - normal mode
OFF (Up)
Normal (Down)
Non-redundant mode - normal mode
RTP (Down)
1:1 (Up)
Redundant mode - return to primary (Port 1)
OFF (Up)
1:1 (Up)
Redundant mode - no return to primary (Port 1)
Figure 3: Port Redundant Modes
SW6, SW7 and SW8: Link Modes
The DIP-switches shown in Figure 3 are used to configure the link modes. It is recommended
to keep link mode DIP-switches in the default Left position during the initial installation. After
the circuit has been tested and operational, configure the module for the desired mode.
SW6
SW7
SW8
Function
Link Mode
Association
Down
Down
Down
Link Segment (LS)
Independent
Up
Down
Down
Asymmetrical Link Propagate Redundant Uplink (ALP RU)
P1 + P2
P3
Down
Up
Down
Asymmetrical Link Propagate
Multi-Tenant 1 (ALP MT1)
P3
P1 & P2
Up
Up
Down
Asymmetrical Link Propagate
Multi-Tenant 2 (ALP MT2)
P1
P2 & P3
Down
Down
Up
Remote Fault Detect 3-Port (RFD 3P)
Independent
Up
Down
Up
Asymmetrical Link Pro Remote Fault Detect
Redundant Uplink (ALP+RFD RU)
P1 + P2
P3
Down
Up
Up
Asymmetrical Link Pro Remote Fault Detect
Multi-Tenant 1 (ALP+RFD MT1)
P3
P1 & P2
Up
Up
Up
Asymmetrical Link Pro Remote Fault Detect
Multi-Tenant 2 (ALP+RFD MT2)
P1
P2 & P3
Figure 3: Link Mode Settings
Link mode association describes the relationship between the port(s) experiencing a fault
condition and to what port(s) the fault will propagate. P1+P2 P3 indicates faults on both
Page 2
Page 3
Port 1 and Port 2 will propagate to Port 3. If only Port 1 or Port 2 has a fault, the fault will not
be propagated to Port 3. It requires faults on both ports to propagate a fault condition.
For detailed information on the operation of the different Link Modes, download the complete
User Manual on the 3-Port GM3 modules by accessing Omnitron’s registration page and
register the product:
http://www.omnitron-systems.com/forms/product_registration.php
2) INSTALL STANDALONE MODULE AND CONNECT CABLES
a. The GM3 is available in tabletop and wall-mount models. For wall-mounting, attach the
GM3 to a wall, backboard or other flat surface. For tabletop installations, place the unit
on a flat level surface. Attach the rubber feet to the bottom of the GM3 to prevent the
unit from sliding. Make sure the unit is placed in a safe, dry and secure location.
To power the unit using the AC/DC adapter, connect the AC/DC adapter to an AC outlet.
Then connect the barrel plug at the end of the wire on the AC/DC adapter to the 2.5mm
DC barrel connector (center-positive) on the unit. Confirm that the unit has powered up
properly by checking the power status LED located on the front of the unit.
To power the unit using a DC power source, prepare a power cable using a two conductor
insulated wire (not supplied) with a 14 AWG gauge minimum. Cut the power cable to the
length required. Strip approximately 3/8 of an inch of insulation from the power cable
wires. Connect the power cables to the unit by fastening the stripped ends to the DC
power connector.
Connect the power wires to the DC power source. The Power LED should indicate the
presence of power.
WARNING: Note the wire colors used in making the positive and negative connections.
Use the same color assignment for the connection at the DC power source.
NOTE: If mounting with a safety ground attachment, use the safety ground screw at
the rear of the unit.
b. When using a GM3 model with SFP ports, insert the SFP fiber transceivers into the
SFP receptacles on the module.
NOTE: The release latch of the SFP fiber transceiver must be in the closed (up) position
before insertion.
When using Omnitron SFP fiber transceivers, the GM3 module will detect the speed
and automatically configure the port to match the speed of the SFP. The GM3 module
supports 100BASE-FX and 1000BASE-X SFP transceivers.
Some 3rd party SFP fiber transceivers will require configuration using the CFM CLI
option to set the speed of the port to match the speed of the SFP.
c. Connect the appropriate multimode or single-mode fiber cable to the fiber port of the
installed module. It is important to ensure that the transmit (TX) is attached to the receive
side of the device at the other end and the receive (RX) is attached to the transmit
side. When using single-fiber (SF) GM3 models, the TX wavelength must match the RX
wavelength at the other end and the RX wavelength must match the TX wavelength at
the other end.
d. When using a GM3 model with UTP port(s), connect the port via a Category 5 or better
cable to a 10BASE-T, 100BASE-TX or 1000BASE-T Ethernet device (depending on
the configuration of the port).
3) CONFIGURE MODULE VIA COMMAND LINE INTERFACE
To access the Command Line Interface (CLI), connect the GM3 RS-232 Serial Console
