B-2
Cables
B
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-)
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
Note:
The “+” and “-” signs represent the polarity of the wires that make
up each wire pair.
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 568B RJ-45 Wiring Standard
10/100BASE-TX Straight-through Cable
E
nd
A
E
nd B
Blue
White/Blue Stripe
Brown
White/Brown Stripe
Summary of Contents for FGL-2870
Page 1: ...LevelOne FGL 2870 24 FE 4 GE Combo SFP L2 SNMP Switch Installation Guide Version 1 0...
Page 2: ......
Page 4: ...FGL 2870 E122009 WM R01 149100000059A...
Page 12: ...viii...
Page 22: ...Introduction 1 6 1...
Page 36: ...3 8 Installing the Switch 3...
Page 52: ...C 4 Specifications C...
Page 59: ......
