SMC Networks SMC7904WBRAS-N2 V2 - QUICK, User Manual

Page: 148 / 156

A
PPENDIX
C
| Cables and Pinouts
10/100BASE-TX Pin Assignments
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10/100BASE-TX P
IN
A
SSIGNMENTS
Use unshielded twisted-pair (UTP) or shielded twisted-pair (STP) cable for
RJ-45 connections: 100-ohm Category 3 or better cable for 10 Mbps
connections. Also be sure that the length of any twisted-pair connection
does not exceed 100 meters (328 feet).
The RJ-45 port on the router supports automatic MDI/MDI-X operation, so
you can use straight-through or crossover cables for all network
connections to PCs, switches, or hubs. In straight-through cable, pins 1, 2,
3, and 6, at one end of the cable, are connected straight through to pins 1,
2, 3, and 6 at the other end of the cable.
S
TRAIGHT
-T
HROUGH
W
IRING
If the twisted-pair cable is to join two ports and only one of the ports has
an internal crossover (MDI-X), the two pairs of wires must be straight-
through. (When auto-negotiation is enabled for any RJ-45 port on this
gateway, you can use either straight-through or crossover cable to connect
to any device type.)
Figure 88: Straight-through Wiring
Table 5: 10/100BASE-TX MDI and MDI-X Port Pinouts
PIN
MDI Signal Name a
a. The “+” and “-” signs represent the polarity of the wires that make up each wire pair.
MDI-X Signal Name
1 Transmit Data plus (TD+) Receive Data plus (RD+)
2 Transmit Data minus (TD-) Receive Data minus (RD-)
3 Receive Data plus (RD+) Transmit Data plus (TD+)
6 Receive Data minus (RD-) Transmit Data minus (TD-)
4, 5, 7, 8 Not used Not used
White/Orange Stripe
Orange
White/Green Stripe
Green
1
2
3
4
5
6
7
8 1
2
3
4
5
6
7
8
EIA/TIA 56 8 B RJ-45 Wiring Standard
1 0/ 1 00BASE-TX Straight-through Cable
End A
End B
Blue
White/Blue Stripe
Brown
White/Brown Stripe