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: When the UTP port is congured for MAN, the port is congured for 100Mbps
full-duplex.
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 gure 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 4 are used to congure the link modes. It is recommended
to keep link mode DIP-switches in the default Down position during the initial installation.
After the circuit has been tested and operational, congure 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 Propagate + Remote Fault Detect
Redundant Uplink (ALP+RFD RU)
P1 + P2
P3
Down Up Up
Asymmetrical Link Propagate + Remote Fault Detect
Multi-Tenant 1 (ALP+RFD MT1)
P3
P1 & P2
Up Up Up
Asymmetrical Link Propagate + Remote Fault Detect
Multi-Tenant 2 (ALP+RFD MT2)
P1
P2 & P3
Figure 4: 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
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 GM4 module available to registered users on Omnitron’s web site.
DIP-SWITCH BANK 2
DIP-switch Bank 2 is available on units with product revision of xx/45 or later. The product
Page 2 Page 3
revision is located on the label on the bottom of the unit. These features are available through
management access.
The function of DIP-switch Bank 2 is outlined in the Figure 5 below.
Switch Position Description Down (Default) Up
1 Reserved - -
2 Reserved - -
3 Reserved - -
4 Zero Touch Disable Enable
Figure 5: DIP-switch Bank 2
SW1, SW2 and SW3: Reserved
These DIP-switches are reserved and must be left in the default Down position.
SW4: Zero Touch
This DIP-switch congures the Zero Touch Provisioning (ZTP) behavior. ZTP utilizes DHCP
and TFTP to automatically congure the module during the initial setup.
ZTP is disabled by default. When SW4 is in the UP position, ZTP is enabled. When enabled,
the module will start the DHCP process on power up or module reboot. Through the process,
the module will request an IP address and the IP address of the TFTP Server. After the DHCP
process has been completed and a TFTP Server IP address has been obtained, the module
will request conguration les from the TFTP Server. When the les have been received,
the module will load the conguration les and restart.
2) INSTALL STANDALONE MODULE AND CONNECT CABLES
a. The GM4 Ethernet Demarcation Device is available as a tabletop or wall-mount model.
For wall-mount installation, attach the module to a wall, backboard or other at surfaces
with appropriate screws (not included). For tabletop installation, place the module on
a at and level surface. Attach the rubber feet to the bottom of the module to prevent
the module from sliding. Make sure the module is placed in a safe, dry and secure
location.
To power the device using the AC/DC adapter, connect the DC plug at the end of the
wire on the AC/DC adapter to the DC connector on the device, Then connect the AC/
DC adapter to an AC outlet. A ‘P’ clamp is included to provide strain relief for the AC/
DC cable. Attach the ‘P’ clamp to the safety ground screw located at the rear of the
module. Conrm that the module has powered up properly by checking the Power
LED located on the front of the module.
NOTE: When using the ‘P’ clamp, attach the ‘P’ clamp to the safety ground screw.
Make sure the ‘P’ clamp in installed between the washer and the screw.
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
indicates 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.