Transition Networks SM24-100SFP-AH Manuel d'utilisateur télécharger pdf (Page 44)

B-2

Cables

Straight-Through Wiring

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 switch, you can use either

straight-through or crossover cable to connect to any device type.)

You must connect all four wire pairs as shown in the following diagram to support

Gigabit Ethernet connections.

Figure B-2. Straight-through Wiring

Crossover Wiring

If the twisted-pair cable is to join two ports and either both ports are labeled with an

“X” (MDI-X) or neither port is labeled with an “X” (MDI), a crossover must be

implemented in the wiring. (When auto-negotiation is enabled for any RJ-45 port on

this switch, you can use either straight-through or crossover cable to connect to any

device type.)

You must connect all four wire pairs as shown in the following diagram to support

Gigabit Ethernet connections.

Table B-1. 10/100BASE-TX MDI and MDI-X Port Pinouts

Pin MDI Signal Name MDI-X Signal Name

1 Transmit Data plus (TD+) Receive Data plus (RD+)

2 Transmit Data minus (TD-) Receive Data minus (RD-)

Receive Data plus (RD+) Transmit Data plus (TD+)

Receive Data minus (RD-) Transmit Data minus (TD-)

4,5,7,8

Not used Not used

Note: The “+” and “-” signs represent the polarity of the wires that make

up each wire pair.

White/Orange Stripe

Orange

White/Green Stripe

Green

EIA/TIA 568B RJ-45 Wiring Standard

10/100BASE-TX Straight-through Cable

End A

End B

Blue

White/Blue Stripe

Brown

White/Brown Stripe

1 2 ... 39 40 41 42 43 44 45 46 47 48 49 ... 59 60

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Transition Networks SM24-100SFP-AH Manuel d'utilisateur Page 44