Outline the rules for creating CSMA/CD network access including the need to limit cable distances?
369708
Defining SSMA/CD...\nShort for Carrier Sense Multiple Access / Collision Detection, a set of rules determining how network devices respond when two devices attempt to use a data channel simultaneously (called a collision). Standard Ethernet networks use CSMA/CD to physically monitor the traffic on the line at participating stations. If no transmission is taking place at the time, the particular station can transmit. If two stations attempt to transmit simultaneously, this causes a collision, which is detected by all participating stations. After a random time interval, the stations that collided attempt to transmit again. If another collision occurs, the time intervals from which the random waiting time is selected are increased step by step. This is known as exponential back off. \nCSMA/CD is a type of contention protocol.  Networks using the CSMA/CD procedure are simple to implement but do not have deterministic transmission characteristics. The CSMA/CD method is internationally standardized in IEEE 802.3 and ISO 8802.3. \n\nCable distances are limited to 100m for cat 5 cableing which includes the length of the run as well as the patch cable lengths...Any longer is strongly not recommended, as it causes a "lag" time for transmitting data that results in a conflict as indicated in the info above!
102618
this question has a lengthy answer, so i hope you wouldn't mind if i just point to some sources of mine: \n\nhttp://www.homenethelp.com\n\nhttp://www.theresourcefork.com/WWWserver/techinfo/Build_Your_Own_Crossover_Cable/index.shtml
20482
How far do you want to extend your network? Do you alrady have an established wired LAN? If this is a simple home network, you could get a new wireless router. The 250 Mbs wireless routers (~100 Mbs actual) are now shipping which is speed is comparable to a wired LAN, with the range of a Pre-N. \n\nIf you already have a wireless router, you may be able to swap out the antennas. Otherwise if you want an industrial solution, you could use a high gain antenna or even an amplifier http://www.hyperlinktech.com/\n\nNote: if you use a wireless extender/repeater, then your client-side thruput will be cut in half.\n\n-Vic
435687
Not a good question for you to be asking when you've already been entrusted to this.  You can use private IP space if you have the capability to use NAT.
947396
ideally and cheaply put one in the center of the house... this not only gives you good range for single access point but also reduces the amount of signal that goes out to the surrounding area.... so that someone in the street finds it harder to find your signal...\n\nIm not sure what kind of wireless router options Comcast offer... but make sure you get a wireless router/modem option that has strong security / encryption for your signal.. as the signal transmitter will be close to an external wall... \nI have a Belking wireless modem/transmitter for my connection that not only has a strong signal and encryption but also has an option for "Bridge".\n\nThis means i can get more of them and use them in Bridging mode. You then enter the MAC addresses of the routers on either side of it and it will talk  to them (only them)  and pass the signal along.\nNo extra network cables... all you need are places that you can put a extra hardware with a plug socket. I have used this configuration in 4 story houses and it worked fine.\n\nso bascially find a quality router that offers the bridge option.\n\nremember that you WILL need a computer with a nic card in it to set the routers up... if its a laptop even better... as you will need to check them just like any access point that is not directly attached to a network cable.\n\ngood luck.
198965
About.com usually have articles on setting up WLAN\n\nCNET has some good stuff too.
866263
Token passing is an excellent way to eliminate collisions.  Only stations with "the token" are permitted to communicate...kind of like "raising your hand" in a classroom to prevent everyone from talking at the same time.\n  \nThis is fundamentally different from the CSMA/CD technology that standard ethernet uses to reduce collisions.  (basically...after a collision, each station waits a random amount of time before retransmitting):\nhttp://www.webopedia.com/TERM/C/CSMA_CD.html
818206
Check the wireless networking forum at dslreports.com.  Also, rephrase your question so that it makes more sense.   What do you mean by 2000 km and 200 nodes?  Do you mean each node needs to have a range of 2000 km?
989097
Some routing software allows such a limit\n\nYou will probably need to have a linux based router though and spend some time configing it
526139
1. dont broadcast ssid\n2. create a ssid that is long and alpha numeric\n3. use wep or wpa\n4. use mac address filter\n5. use time restriction\n6. use wireless station listing\n7. set password to admin \n8. change the above once in a while
534435
You will need the following\n* wireless cards for each host\n* wireless access point\n\nYou should also consider enabling WEP or WPA encryption.  Other settings that will help you keep out novice hackers are MAC Filtering, and disabling the broadcast of the SSID.
277958
Find out if your local ISP supports Muti-Link accounts. If not,let them know that they can have a market from those without the access to broadband for better connection speeds over rural areas. This is how to setup a home PC and/or network with two modems and a phone. This can increase the speed of dial-up users in remote areas.It requires a minimum of Windows 98 or above, two phone lines, one dial-up connection with two logs-ins allowed. \n\n\n\n\nSteps --\n\nAlmost all computers come with one modem installed. It is best to have matching modems for the best connection speed. This means you will have to get another using a version of Windows or Linux. I have connected at a steady rate of 64K with two Rockwell based 56K modems, at a distance of about 25 miles from a local town. You will also need two separate phone lines for each modem. I am including a list of steps to take to set it up, and dial away. \n\nUnder the Windows Xp version I have tested, I use the dial-up creation dialog. \n\nClick next, and it will ask for what network type. Just leave it at the default setting (connect to the internet). \n\nClick next, and you can choose the type of service you would like to use. I chose to setup my account manually, and that works under both Windows and Linux. \n\nClick next and select connect using dial-up modem. \n\nClick the next button, give the dial-up connection a name which can be anything you care to name it. \n\nClick next, and enter the telephone number needed to access the net. Make sure that it's not a long distance number or toll charges will mount pretty quickly. \n\nClick next and enter the user name and password, which will be used for logging in to their server. Most any service provider uses PAP or CHAP authentication, though you may have to manually setup the primary and secondary IP addresses again depending on the type of service they are willing to provide. \n\nClick next and make sure that the check boxes are setup the way you want them to stay. I chose to allow anyone dial-up access on the computer. \n\nWith a family living in a rural area, it can take over TV time and sometimes make it hard to have time when sharing just one computer. \n\nThe last step in the dialog process is to create it. You can also put a check in the box to have windows create an icon to launch it from the desktop. \n\nMake sure both phones are clear in tone with no noticeable static or wavering noises. \n\nConnect the phone lines to each phone line junction box. Click finish.Now we are ready to edit the dialog for a specific setting. I chose to create an icon to place on the task bar under the quick start menu. \n\nDouble click on the name of the icon created for your connection. You will default to the general tabbed window of another dialog box, it is here that we want to change some settings. \n\nSince I have two computers I have hooked them up using CAT5 cable through a 5 port Switch. Setting up a local address should be in the range of 192.168.0.1 through 192.168.0.10. Although it is a very long subject, each network card should have its own IP address. \n\nNow click on the properties button on the connection dialog. Click on the networking tab in the dialog box and click on the settings button right below the "Type of Dial-up" settings. Another smaller dialog box will appear with three check boxes. Only two should be set and they are: \n\nEnable software compression, and negotiating multi-link for single dial-up. Leave "enable LCP extension" alone unless required by your particular service. \n\nClick the ok button, and if needed now you can setup whatever IP address is used for your connection. Some are best left as default unless you need to setup a separate DNS number such as a static IP address on your local internet service. \n\nUnder the advanced tab of this dialog, you must setup one computer for the gateway dial out. This is the one with the two modems. With the phones connected to the modems g
488242
no dail up is close to dls or cable modem
356544
Here are the different types of cabling and the maximum distance they can run:  \n\nUse a 10Base5 Thick Coaxial 500 meters\n  \n10BaseT Unshielded Twisted Pair 100 meters\n10Base2 Thin Coaxial 185 meters\n10Base5 Thick Coaxial 500 meters\n10BaseF Fiber Optic 2000 meters\n100BaseT Unshielded Twisted Pair 100 meters\n100BaseTX Unshielded Twisted Pair 220 meters
893150
http://www.cable-modems.org/q&a/index.php?one_question=17\n\nRead here....this is better\nhttp://antionline.com/archive/index.php/t-264483.html
982314
The router manufacturers will tell you they broadcast several hundred feet--but in reality (through walls and floors) don't expect more than 50 feet.  I had my best luck using a USB receiver on a pc (you can extend the usb connection about 20 feet before you lose signal through the cable.  (USB also lets you change computers quickly.)  If you extend your antenna wire (for your PCI card or on your router)--I was assured that you could add up to 100 feet of antenna cable (for a slight loss.)\n\nYou will find that experimentation with your particular system will yield your best results.
744036
put it in a central location in your house, preferably with the fewest number of walls between your computer and the router.\n\nMake sure your antennae are fully extended on router and receiver - and have a clear shot at each other(or as best as can be expected).