Twisted Pair Facts

Question 1

Twisted Cabling is composed of what?

Answer 1

• 4 pairs of copper wires carry the data signals ( one positive one negative
• Wires twisted to reduce EMI/Crosstalk
• PVC plastic insulation surrounds each copper wire

Question 2

UTP

Answer 2

• Only has an outer plastic sheath

* Are easy to work with and less expensive than shielded cables

Question 3

STP

Answer 3

• Has grounded outer copper shield around either the entire wire bundle or each wire
• Provides additional EMI protection* Cos considerable more than UTP

Question 4

Cat 5

Answer 4

• Connector: FJ-45
• Speed: 100 Mbps
• Frequency : 100 MHz
• Supports up to 100 Mbps Ethernet

Question 5

Cat 5e

Answer 5

• Connector: FJ-45
• Speed: 1000 Mbps
• Frequency : 100 MHz
• Similar to Cat 5 but provides better EMI protection. Supports gigabit Ethernet (gigabit connections require the use of all four twisted pairs)

Question 6

Cat 6

Answer 6

• Connector: FJ-45
• Speed: 10 Gbps
• Frequency : 250 MHz
• 10 Gbps are limited to cable lengths less than 55 meters

Question 7

Cat 6e

Answer 7

• Connector: FJ-45
• Speed: 10 Gbps
• Frequency : 500 MHz
• Provides additional shielding and tighter cable twists than standard Cat 6

Question 8

Cat 7

Answer 8

• Connector: FJ-45
• Speed: 10 Gbps
• Frequency : 600 MHz
• Has the strictest specification for crosstalk and noise

Question 9

Twisted Pairs uses what kind of connector

Answer 9

RJ-45

Question 10

RJ-45 Characteristics

Answer 10

• Have 8 connectors (pins)
• Support up to 4 pairs of wires
• Use a locking tab to keep the connector secure in an outlet

Question 11

Cat 5 communication pins

Answer 11

• Pin 1: Tx+
• Pin 2: Tx-
• Pin 3: Rx+
• Pin 4: Unused
• Pin 5: Unused
• Pin 6: Rx-
• Pin 7: Unused
• Pin 8: Unused

Question 12

Cat 5e communication pins

Answer 12

• Pin 1: Bi+
• Pin 2: Bi-
• Pin 3: Bi+
• Pin 4: Bi+
• Pin 5: Bi-
• Pin 6: Bi-
• Pin 7: Bi+
• Pin 8: Bi-

Question 13

Auto-MDIX

Answer 13

• Devices that are capable of 1000 Mbps or faster

* Can automatically change the sending/receiving pin positions depending on the connected device

Question 14

10/100 Mbps devices require a crossover cable when making following device connections

Answer 14

• Switch to switch
• Switch to hub
• Hub to hub
• Workstation to router
• Workstation to workstation
• Router to router