W10L3 - Ethernet: Signaling and Timing

Question 1

What does regular transitions in voltage ensure? (Ethernet)

Answer 1

What keeps clock running at an appropriate rate? (Ethernet)

Question 2

802.3 Manchester Encoding (finish the info)
Used on coax and 10Base-T Ethernet
Goal is to ensure regular voltage transition for clocking

Answer 2

802.3 Manchester Encoding (finish the info)
0 is conveyed by going from high to low
1 is conveyed by going from low to high
Clock rate is twice the data rate

Question 3

1000BaseTX (finish the info)
Reduces crosstalk by adding an extra level (0 volts)
Multi-level Transmit

Answer 3

1000BaseTX (finish the info)
1 = change the voltage
0 = keep the same voltage

Question 4

4B5B

Answer 4

Sending an extra bit to ask for a clock sync

Question 5

Crossover Cable

Answer 5

Cable where transmit pair has been wire to receiver pair at the other end and vice versa

Question 6

Cat5 links computers together without immediate hub or switch. What else?

Answer 6

Cat5 links hubs, terminals together. What else?

Question 7

How does 1000MBps get transmitted on a 125MHz cable?

Answer 7

Use all four pairs in both directions
Four levels
Add another bit to allow coding for error recovery
-2, -1, 0 +1, +2

Question 8

What keeps clock running at an appropriate rate? (Ethernet)

Answer 8

What does regular transitions in voltage ensure? (Ethernet)

Question 9

802.3 Manchester Encoding (finish the info)
0 is conveyed by going from high to low
1 is conveyed by going from low to high
Clock rate is twice the data rate

Answer 9

802.3 Manchester Encoding (finish the info)
Used on coax and 10Base-T Ethernet
Goal is to ensure regular voltage transition for clocking

Question 10

1000BaseTX (finish the info)
1 = change the voltage
0 = keep the same voltage

Answer 10

1000BaseTX (finish the info)
Reduces crosstalk by adding an extra level (0 volts)
Multi-level Transmit

Question 11

Sending an extra bit to ask for a clock sync

Answer 11

4B5B

Question 12

Cable where transmit pair has been wire to receiver pair at the other end and vice versa

Answer 12

Crossover Cable

Question 13

Cat5 links hubs, terminals together. What else?

Answer 13

Cat5 links computers together without immediate hub or switch. What else?

Question 14

Use all four pairs in both directions
Four levels
Add another bit to allow coding for error recovery
-2, -1, 0 +1, +2

Answer 14

How does 1000MBps get transmitted on a 125MHz cable?