I started to attend network class and there we were taught that when checking for encoding methods we should care about these 4 things:

1) Frequency of signal change in order to encode the data

2) Is there a dc component of the signal?

3) Is a separate clock wire required or is the encoding self-clocking?

4) Error Detection(asy 

How can I successfully meet these 4 criteria?

I have a wireless g connection with that connects to a wireless n adapter, the link speed is 11Mbs when I check under the properties of the connection type. How can I improve the link speed to around 54Mbs for the connection between the router and the adapter? And can the speed be fixed at a certain value?

I have an infrared based phone and wanted to know what would be the range for the connection of this device with my laptop that is fully compatible infrared. How fast can I transfer data between the hone and the laptop given the fact that its a point to point connection? What security measures are there like the encryption?

How many WPS connections can routers do at a given time? Is it possible to do a WPS based security connection to two devices simultaneously or is the connection alternatively? How safe is the WPS over the WPA encryption method and what may be some of the demerits of one over the other? I have noticed that many still use WPA despite the easier to operate WPS security.

I have a wireless adapter USB that I would want to reduce the transmission beacons, what would be effects to the network in terms of performance and power consumption for the wireless adapter? How can I then save on power due to connections on a wireless adapter? what is the best transmission of beacons or should I just choose the default? I want to be able to save on power when the adapter is no linking up to the network.

In my area there are 10 wifi networks and I was primarily concerned about the frequency interface of the devices to other devices. Is it possible to change the frequency of a wifi network transmitter from 2.4Ghz to another value? How would you establish that another wireless signal is cause interference to your own network?

I have a RJ 45 cable that is unshielded, is there a way that I can shield this to avoid interference? I was made away of the shielded cables and their speeds are quiet fast, I would like to achieve these high speeds. Do I need to buy another or can I just use these cables but how can their speeds be improved?

I have an existing wireless connection that connects me to the internet with my neighbor. However one of our neighbors wanted to join, but the wireless range is too long. I head of a power line adapters, how can I integrate this with a wireless signal? is there a way I can use a bridged connection to the adapters?

I backed up my MacBook to my  iCloud account. When I went back to restore my machine there was folders showing. But all the folders are empty. Where did my files go and how can I get them back to my MacBook? Did I just lose everything or can this be fixed?

I have a wireless signal that is not reaching the intended clients in my area, I overhead about a wireless extender, what is the principle of operation? How does the extender differ from a repeater and at what distance within the signal range should in be located? Do the extender give a directional or a radial signal?