Cables Flashcards
A cable jacket is…
The outermost layer around a cable
Resistance is…
The “push-back” that occurs from metal during a transmission.
Over a short run, this is almost unnoticeable.
The longer the run, the greater the resistance. This causes network signals to degrade over distance, referred to as attenuation.
Attenuation is…
The loss of network signal over a long run.
Advantages and disadvantages of copper-clad aluminum Ethernet cables
Advantage: costs less.
Disadvantages:
- greater resistance
- poorer network signals (faster signal attenuation)
- greater resistance generate more heat
Marked as “CCA”
When would you want to use solid core cables?
Longer cable runs.
There is decreased resistance, but greater metal fatigue.
When would you want to use stranded cables?
Shorter cable runs.
There is increased resistance, but less metal fatigue.
What is interference with cabling?
What are some examples?
Disruptions that come from outsides sources, also referred to as electromagnetic interference (EMI).
Examples:
- power cables
- HVAC units
- vacuums
- elevators
In Ethernet cables, why are paired wires twisted around each other?
To help cancel out fields in regard to EMI
What are the steps for terminating CAT6 RJ45 Connectors?
1) Prepare the cable
2) Arrange and trim the wires
3) Insert the wires into the RJ45 connector
4) Crimp
5) Terminate the other end of the cable
6) Test the cable
CAT 5e cables
were the go to standard for many years.
It is an unshielded cable that supports speeds up to 1 gig
CAT 6 cables
The wires pairs are wound more tightly than a CAT5e cable.
They have a plastic core, which helps reduce interference between wire pairs.
CAT 6 Shielded cables
Has a thicker copper wire and shielding.
Fully supports 10gig Ethernet for distances up to 100 meters.
CAT 7a cables
Have shielded outer jackets, as well as shielding around each pair to protect even more against interference.
Maximum run length for Ethernet cables
100 meters / 330 feet
What type of cable should be used for runs between buildings?
Fiber-optic
It’s non-conductive and will not transfer a surge to the connected building.
If two hosts are connected via a switch, what is the maximum possible cable run distance?
200 meters
What is an uplink/downlink?
A cable that connects two switches together
