10-19-2005, 05:13 PM
Network topology is not only what devices you have, but how they're connected. The easiest way to represent it is graphically.
Crossover is mapped thusly:
1 -> 3
2 -> 6
3 -> 1
4 -> 4
5 -> 5
6 -> 2
7 -> 7
8 -> 8
The swapped pairs (one/three, and two/six) are two sets of Tx and Rx lines. The "crossover" is plugging the other host's transmit lines into your receives, and vice versa. The rule of use is "crossover for like devices", so if you connect to another computer to access the Internet, you'd use it. Household routers are made such that they always take straight-through, even going between routers. If you have cisco switches, they have a little 'x' under RJ45 ports to indicate how it's wired.
That's why it's important to know the topology.
Crossover is mapped thusly:
1 -> 3
2 -> 6
3 -> 1
4 -> 4
5 -> 5
6 -> 2
7 -> 7
8 -> 8
The swapped pairs (one/three, and two/six) are two sets of Tx and Rx lines. The "crossover" is plugging the other host's transmit lines into your receives, and vice versa. The rule of use is "crossover for like devices", so if you connect to another computer to access the Internet, you'd use it. Household routers are made such that they always take straight-through, even going between routers. If you have cisco switches, they have a little 'x' under RJ45 ports to indicate how it's wired.
That's why it's important to know the topology.