- CABLETRON Systems, Inc, SmartSwitch User's Guide 2E42-27, 2E42-27R, 2E43-27, 2E43-27R

2E42-27/2E42-27R/2E43-27/2E43-27R User’s Guide B-1
APPENDIX B
FE-100TX, FE-100FX, AND FE-100F3
SPECIFICATIONS
The 2E4X-27 supports three Fast Ethernet Interface Modules:
• FE-100TX (Section B.1)
• FE-100FX (Section B.2)
• FE-100F3 (Section B.3)
This appendix provides the specifications for these modules.
B.1 FE-100TX
The slide switch on the FE-100TX determines the crossover status of the
cable pairs. If the switch is on the
X side, the pairs are internally crossed
over. If the switch is on the
= side, the pairs are not internally crossed
over. Figure B-1 shows the pinouts for the FE-100TX in both positions.
Figure B-1 FE-100TX Pinouts
NOTE
To ensure proper operation, use only Category 5 Unshielded
Twisted Pair (UTP) cabling that has an impedance between 85
and 111 ohms.
Position X
(crossed over)
1. RX+
2. RX-
3. TX+
4. NC
5. NC
6. TX-
7. NC
8. NC
Position =
(not crossed over)
1. TX+
2. TX-
3. RX+
4. NC
5. NC
6. RX-
7. NC
8. NC
FE-100TX
10
16651_05
100
=
x