Cables, etc.

Question 1

What is the pinout for a crossover cable?

Answer 1

1 to 3, 2 to 6, 3 to 1, 6 to 2

TIA/EIA 568 crossed wiring:
1 - 3
2 - 6
3 - 1
4 - 7
5 - 8
6 - 2
7 - 4
8 - 5

Question 2

What type of cable would you use to connect a PC to a router’s ethernet port?

Answer 2

Crossover

Question 3

What is the 568A color coding standard? 568B?

Answer 3

568A:

GW, G, OW, Bl, BlW, O, BrW, Br

568B:

Orange-white, orange, green-white, blue, blue-white, green, brown-white, brown.

Question 4

What is the pinout for a 568A to 568B cable? What is this type of cable called? What devices can it connect?

Answer 4

1 2 3 4 5 6 7 8

3 6 1 4 5 2 7 8

Or

1-3, 2-6, 3-1, 4-4, 5-5, 6-2, 7-7, 8-8

568A to 568B (or vice versa) is a crossover cable, which can be used to connect similar devices. The only exception to this rule is that a PC to router ethernet port also requires a crossover cable.

| | | | | | |

Question 5

What type of cable is a 568B to 568B (mirrored)? What’s the pinout? What devices would you use this cable to connect?

Answer 5

A rollover (rolled) cable:
GW, G, OW, Bl, BlW, O, BrW, Br
| | | | | | | |
Br BrW O BlW Bl OW G GW

You can use a rollover cable to connect a PC to a router’s console port.

Question 6

How many wire pairs does 100 base-T use? What’s the IEEE standard? What’s the pinout on a 100-base-T crossover cable?

Answer 6

2 pairs

802.3u

1 - 3 2 - 6 3 - 1 6 - 2

Question 7

How many wire pairs does 10-base-T use? What’s the IEEE standard? What’s the pinout on a 10-base-T crossover cable?

Answer 7

2 pairs

802.3i

1 - 3 2 - 6 3 - 1 6 - 2

Question 8

How many wire pairs does 1000-base-T use? What’s the IEEE standard? What’s the pinout on a 1000-base-T crossover cable?

Answer 8

4 pairs

802.3ab

1 - 3 2 - 6 3 - 1 4 - 7 5 - 8

6 - 1 7 - 4 8 - 5