Installation guide

RJ45 (10-pin) to DB25 (F) Cable Wiring
RJ45 Plug Pin 1
DCD
DSR
RTS
GND
TxD
RxD
CTS
DTR
DCD
DTR
CTS
GND
RxD
TxD
RTS
DSR
1
2
3
4/7
5
6
8
9
8
6
4
7
2
3
5
20
10/100BaseT(X) Ethernet Port Connection
The 10/100BaseT(X) port is on the VPort 251’s front panel and is used to
connect to Ethernet-enabled devices. The following table shows pinouts for
both MDI (NIC-type) ports and MDI-X (hub/switch-type) ports. Cable wiring
diagrams are also provided for straight-through and cross-over Ethernet cables.
(MDI) Port Pinouts (MDI-X) Port Pinouts 8-pin RJ45
Pin Signal
1 Tx+
2 Tx-
3 Rx+
6 Rx-
Pin Signal
1 Rx+
2 Rx-
3 Tx+
6 Tx-
18
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-
VPort Ethernet
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
NIC Port
RJ45
Connector
RJ45
Connector
Tx+
Tx-
Rx+
Rx-
(Rx+)
(Rx-)
(Tx+)
(Tx-)
(Tx+)
(Tx-)
(Rx+)
(Rx-)
VPort Ethernet
Port
Cable Wiring
3 1
6 2
1 3
2 6
Rx+
Rx-
Tx+
Tx-
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