
VC-400LT/RT+ VDSL2 CO&CPE Router MANUAL Ver.B3
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Appendix C: Cable Requirements
A CAT 3, 4 or 5 UTP (unshielded twisted pair) cable is typically used to connect the
Ethernet device to the modem. A 10Base-T cable often consists of four pairs of wires, two
of which are used for transmission. The connector at the end of the 10Base-T cable is
referred to as an RJ-45 connector and it consists of eight pins. The Ethernet standard uses
pins 1, 2, 3 and 6 for data transmission purposes. (Table C-1)
Table C-1 RJ-45 Ethernet Connector Pin Assignments
MDI
MDI-X
PIN
#
Signal
Media
Dependa
nt
interface
Signal
Media
Dependant
interface-cross
1 TX+
Transmit
Data +
RX+
Receive Data
+
2 TX-
Transmit
Data -
RX-
Receive Data
-
3 RX+
Receive
Data +
TX+
Transmit
Data +
4 --
Unused -- Unused
5 --
Unused -- Unused
6 RX-
Receive
Data -
TX-
Transmit
Data -
7 --
Unused -- Unused
8 --
Unused -- Unused
Figure C-1 Standard RJ-45 repectacle/connector
Note:
Please make sure your connected cables are with same pin assignment as above table before
deploying the cables into your network.
Figure C-2 Pin Assignments and Wiring for an RJ-45 Straight-Through Cable