Panasonic 324566-A User Manual

Page of 172
Nortel Secure Router 8012 
Hardware Description 
5 Cables 
 
Issue 5.3 (6 April 2009) 
Nortel Networks Inc. 
5-5 
 
5.5 
Ethernet cable 
5.5.1 Introduction 
The Ethernet cable consists of two types: straight-through cable and crossover cable. 
Straight-through cable 
Straight through cable
 is also called standard cable. The wire sequences of the twisted pairs 
crimped in the RJ45 connectors at both ends are the same. Straight-through cable connects a 
terminal device (a PC or the router) to a hub or a LAN switch. The cables delivered with the 
equipment are straight-through cables. 
Crossover cable 
Crossover cable
 is also called direct connection cable. The wire sequences of the twisted pairs 
crimped in the RJ45 connectors at both ends are different. Crossover cable connects two 
terminal devices (a PC or the router). 
5.5.2 Structure 
Both straight-through cable and crossover cable use shield cables and RJ45 connectors. Figure 
5-3 a
nd Figure 5-4 show the pin assignment. 
Figure 5-3 Schematic diagram of straight-through cable 
1
2
3
6
1
2
3
6
RJ45
RJ45
 
 
Figure 5-4 Schematic diagram of crossover cable 
1
2
3
6
1
2
3
6
RJ45
RJ45
 
 
Table 5-3 and Table 5-4 describe the pin assignment of straight-through cable and crossover 
cable.