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ATTENTION
Before connecting the EDS to the DC power inputs, make sure
the DC power source voltage is stable.
Communication Connections
EDS-305 models have 4 or 5 10/100BaseT(X) Ethernet ports, and 1 or 0 (zero)
100 BaseFX (SC/ST-type connector) fiber ports.
10/100BaseT(X) Ethernet Port Connection
The 10/100BaseT(X) ports located on the EDS’s front panel are used to
connect to Ethernet-enabled devices.
Below we show pinouts for both MDI (NIC-type) ports and MDI-X
(HUB/Switch-type) ports, and also show cable wiring diagrams for
straight-through and cross-over Ethernet cables.
MDI Port Pinouts
MDI-X Port Pinouts
8-pin RJ45
Pin
Signal
Pin
Signal
1
Tx+
1
Rx+
2
Tx-
2
Rx-
3
Rx+
3
Tx+
6
Rx-
6
Tx-
RJ45 (8-pin) to RJ45 (8-pin) Straight-Through Cable Wiring
Straight-Through Cable
RJ45 Plug Pin 1
Switch Port
RJ45
Connector
RJ45
Connector
Tx+
Tx-
Rx+
Rx-
NIC Port
Cable Wiring
3
3
6
6
1
1
2
2
Rx+
Rx-
Tx+
Tx-
RJ45 (8-pin) to RJ45 (8-pin) Cross-Over Cable Wiring
Cross-Over Cable
RJ45 Plug Pin 1
Switch Port
(NIC Port)
RJ45
Connector
RJ45
Connector
Tx+
Tx-
Rx+
Rx-
(Rx+)
(Rx-)
(Tx+)
(Tx-)
(Tx+)
(Tx-)
(Rx+)
(Rx-)
Switch Port
(NIC Port)
Cable Wiring
3
1
6
2
1
3
2
6
Rx+
Rx-
Tx+
Tx-
100BaseFX Ethernet Port Connection
The concept behind the SC/ST port and cable is quite straightforward. Suppose
you are connecting devices I and II. Contrary to electrical signals, optical
signals do not require a circuit in order to transmit data. Consequently, one of
the optical lines is used to transmit data from device I to device II, and the
other optical line is used transmit data from device II to device I, for
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