Cisco Systems 7401ASR manual 3 34 5

A-7
Cisco 7401ASR Installation and Configuration Guide
OL-5419-01 B0
AppendixA Specifications Fast Ethernet/Ethernet RJ-45 Port Pinouts
FigureA-1 RJ-45 Port and Connector
Note With reference to the RJ-45 pinouts in Table A-8 , proper common-mode line terminations should be
used for the unused Category 5 UTP cable pairs 4/5 and 7/8. Common-mode termination reduces
electromagnetic interference (EMI).
Use the pinouts shown in Figure A-2 for straight-through and crossover twisted- pair cable co nnec tio ns
for your RJ-45 interface cabling requirements.
FigureA-2 Fast Ethernet/Ethernet Pinouts—Straight-Through or Crossover Cable
1RJ-45 connector
TableA-8 RJ-45 Receptacle Pinouts
Pin1
1. Any pin not referneced is not connected.
Description
1TxD+
2
2. TxD = Transmit Data
2TxD–
3RxD+
3
3. RxD = Receive Data
6RxD–
57574
12345678
1
1Straight-through cable pinout, Ethernet port to
a hub or repeater 4Hub
2Crossover cable pinout, Ethernet port to a
DTE 5DTE
3Ethernet port
1 TxD+
2 TxD–
3 RxD+
6 RxD–
1 RxD+
2 RxD–
3 TxD+
6 TxD–
57607
1 TxD+
2 TxD–
3 RxD+
6 RxD–
1 TxD+
2 TxD–
3 RxD+
6 RxD–
1 2
3 34 5