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Orange and green wires send and receive data. The orange pair sends data, while the green pair receives data. Blue and brown wires are reserved for future bandwidth capacity. The cable standards folks designed CAT-5 with the extra colored wires so that they could be used for higher bandwidths in the future.

The green pair receives data Striped wires are positive, and solid wires are negative. Solid wires are negative. Network speed tells us the rate at which data can move on a wire.

Bandwidth is a capacity; speed is a rate. Bandwidth tells you the maximum amount of data that your network can transmit. Speed tells you the rate at which the data can travel. The speed of a CAT-5 cable changes depending on conditions. What is Base-T? Base-T refers to the different standards for Ethernet transmission rates.

The 10 Base-T standard transfers data at 10 megabits per second Mbps. The Base-T standard transfers data at Mbps.

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The Base-T standard transfers data at a massive Mbps. Megabits per second Mbps is a bandwidth rate used in the telecommunications and computer networking field. One megabit equals one million bursts of electrical current aka binary pulses. Megabytes per second MBps is a data transfer rate used in computing.

One megabyte equals 1, , bytes, and one byte equals 8 binary digits aka bits. All you need is a pair of wire cutters, a utility knife, a crimping tool, and an RJ connector. Cut the broken part out. Cut the cable well before the break to ensure that you have a good set of wire ends. Make the cut as straight as possible so that the individual wires are the same length.

Untwist the wires so that you can line them up with the slots on the RJ connector. Each wire fits into a slot in the RJ connector. Are you trying to get me electrocuted or something?

How do I know which position each wire goes in? Do you expect me to just guess??? Where you put each wire is important. It allows you to plug your cable into a wall jack or the network port of a network device like a computer.

Each wire in the cable goes into a slot inside the RJ connector, and this connects it to a pin in the connector. Each wire in the cable goes into a slot in the RJ connector. This fixes the wire to a pin in the connector. So which wire goes where?

The position of each wire is important. When you plug an RJ connector into a jack, the pins on the connector make contact with pins in the jack. If the wires are in the correct position, this allows information, in the form of electrons, to flow. The order of the wires in an RJ connector conforms to one of two standards. These standards are A and B. Striped green, solid green, striped orange, solid blue, striped blue, solid orange, striped brown, solid brown.

Can you see any similarities between the A and B wire orders? The order for each standard is basically the same except the orange and green wires are switched over. So which standard should you use?

When you attach an RJ connector, the key thing is that both ends of the cable use the same standard. Before fitting a new RJ connector, take a look at the other end of the cable. If the other end of the cable uses standard A for the RJ wire order, then fit your new RJ connector using the A standard. If it uses B, then use this standard instead.

Striped orange, solid orange, striped green, solid blue, striped blue, solid green, striped brown, solid brown. Striped wires alternate with solid colored wires. The B wire order is like the A wire order but with the position of the green and orange wires switched around. What should the wire order be on the other end? Draw a line between each wire and its rightful slot. Normally, he could jump on his favorite search engine to find the pin and wire color arrangement, but the storm has taken out his connection to the Internet.

What can he do? Suddenly, Jack has an idea and leaves the room armed with a pair of scissors. How did Jack solve the problem without looking up Standard B? Five Minute Mystery Download at Boykma. The good end of the broken Coconut Airways network cable has an RJ connector wired up using standard B.

Both ends of the cable need to follow the same wiring standard, so make a note of what the other end uses. Once the lines are in their proper slots, place the RJ into the crimping tool, and then squeeze the tool to crimp the RJ snugly onto the cable.

Check the end of the RJ connector to ensure that the wire is seated correctly in each slot. Five Minute Mystery Solved Q: Through common use, we have come to call an 8P8C connector an RJ connector. The acronym 8P8C stands for 8 positions, 8 contacts.

The RJ connector looks a lot like an 8P8C connector, so over time, many folks mislabeled the connector. Now, through that common but incorrect use, more people call an 8P8C connector an RJ connector.

Why should I always use the same wiring standard on both ends of the cable? Always check the opposite end of the cable and match the wire pair configuration.

What is a crossover cable used for? Suppose you want to connect a laptop to a desktop computer. One way of doing this would be to use a crossover cable, a cable that can send and receive data on both ends at the same time. A crossover cable is different from a straight-through cable in that a straight-through cable can only send or receive data on one end at a time.

How long should I make my CAT-5 cable? The general rule of thumb is that you measure the distance between the devices you want to connect and add one to two feet for flexibility of movement.

The maximum length of CAT-5 is feet meters. Before too long, all of their scheduled flights are fully booked and ready for take-off. Hey, not so fast! What do you think might have gone wrong? They need you to save the day for them again. It looks like a hungry critter has taken a good chunk out of one of the coaxial cables, and the damaged cable has brought things to a standstill. What differences do you see between the two networks? Why do you think they are different? Coaxial T-Connector to connect a workstation to the coaxial bus.

Coaxial Terminator Without this, the network crashes. The rest of the building The basement coax network Download at Boykma. Just like CAT-5 cables, coaxial cables are used to create networks. There are two key differences between them.

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The cables use different sorts of connectors and terminators. CAT-5 cables use RJ connectors. Coaxial cables, on the other hand, use BNC connectors, T-connectors, and terminators. The sort of connector you use depends on why you need it. A coaxial cable has a jacket on the outside, just like a CAT-5 cable. It has a copper core or conductor, with a layer of insulation made of plastic and other materials.

Coaxial Bus Coaxial networks aka RG networks count on a central line, called a bus. The bus functions as the spine of the network. Each workstation on the network or node must be connected to the network with a T-Connector. If the bus is broken, unterminated, or has a broken T-Connector, the entire network will go down.

Network professionals use a kind of shorthand, symbolic diagram to depict a bus network. These diagrams show how all of the parts of a network are organized to work as a whole. We call these structural ideas network topologies. The rodents must have chewed through the bus. If we cut out the chewed part of the cable and stick on another connector, that should fix it. So can we fix the cable? Does this give us enough knowledge to fix the Coconut Airways coaxial network?

You can either crimp or solder the new connector onto the end of the cable. The Accounts staff are still seeing network error messages whenever they try to access their systems. Hmm, I wonder. Not all cable damage is visible from the outside. So how can we detect this sort of damage?

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To do that, we need to dig a bit deeper into how coaxial cables actually work. Do many organizations still use coaxial networks now? Coaxial networks are being phased out by most network administrators. However, the principles behind coaxial network are important for a network professional to understand. No one can predict when all the coaxial networks will become extinct. If coax is being phased out, why do I still need to know about it?

Knowing how coaxial networks work is essential for troubleshooting. Why does a coaxial network need a terminator? Great question! The metal conductor allows electrons to move through it, and the electrons carry your network data. As long as the path of the conductor is complete and unbroken, electrons can flow through it and the network data can travel along the cable.

So what goes on inside a coaxial cable? Electrons flow freely along a continuous metal conductor. The center of the coaxial cableis made of copper. This is a goodconductor for electrons.

A break in the conductor stops the electrons—and the network data—passing through. Connectors conduct electrons, so adding connectors to coaxial network cables helps to maintain continuous electrical flow. Connectors allow electrons to bridge the gap between cables, or between cables and network devices, and this allows your network data to get through. When the conduction is not looped back through the copper core, we say that it is not terminated. A terminator ensures that the signal in the cable keeps moving.

The terminator does this by ensuring that the electrons stay in an electrical loop. If the main cable is not terminated, the network will not function. So how do we find a break in continuity in a coaxial cable network? We need to listen to electrons Resistor Terminator Insulator Insulator Copper core Shielding Shielding The terminator contains a resistor which redirects the electrons and keeps the signal moving. One way of finding a continuity break in a coaxial cable is to listen for signs of life from the electrons, and we can do this using a toner-tracer set.

A toner-tracer set is a tool used by network professionals to detect noises from electrons. You attach the toner part of the toner-tracer set to the network cable, and the toner then sends a generated signal along the cable. You then use the tracer to listen for the signal by placing it on the cable.

The tracer sounds when it hears electrons carrying the signal. It amplifies the signal. Can you hear me? Attach the toner to the network cable. The toner generates a signal and then sends it along the wire. Where electrons are flowing, they carry the signal the toner generates along the wire.

Boop The tracer sounds when it hears the signal. As long as the electrons are flowing where the tracer is, the signal can get to it. Coaxial cable The tracer, or tone-detector Download at Boykma. Did you say something? The toner generates a signal.

The break in continuity is the point where the electrons go quiet. This means that you can find the continuity break by repositioning the tracer until you find the point where the electrons go silent. Dude, are you reading me? Get the medics! A toner is attached to the network cable, and so are several tracers. Assume that each T-connector goes to a functioning workstation. Where do you think the continuity break is if: Only Tracer F is silent.


Only Tracers G and H are silent. None of the tracers are silent. All of the tracers are silent. Only Tracers F and H are silent.

Head first networking

The transmission capacity of a computer network or telecommunication system 4. Signal generator 5. Another name for a straight-through cable. Point where the electrons go quiet. To make a true electrical bus network, use this media. Maximum length of a CAT-5 cable in feet Down 2. A symbolic diagram that shows how a network works.

Equals one million bursts of electrical current 6. A cable that can send and receive on both ends at the same time. How Smart is Your Network? A switch sends frames, and only sends them where they need to go Switches store MAC addresses in a lookup table to keep the frames flowing smoothly The switch has the information Chapter 6 Connecting Networks with Routers: How do we get network traffic to move between networks?

Routers connect networks by doing the math Back at the Moonbase Are you ready to program the router? You just created this router config file! Chapter 7 Routing Protocols: Routing tables tell routers where to send packets Each line represents a different route So how do we enter routes? Routes help routers figure out where to send network traffic So are the moonbases now connected? Back on the moon So how do we troubleshoot bad routes?

The network address changes keep on coming We have lift off! Chapter 8 The Domain Name System: First install a DNS name server The emails are working! Chapter 9 Monitoring and Troubleshooting: