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[[Εικόνα:Greek.jpg]][[Κατηγορίες Κατάλληλων Καλωδίων (για το ethernet και το wireless) και βυσμάτων]]
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== Cables for Wired Networks==
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=== Hardware ===
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The cable used is  RJ-45 UTP cat 5,6 (Unshielded Twisted Pair) or STP (Shielded) which consist of 4 twisted pairs of thin cables.
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Ethernet protocol sets the maximum cable distance to be 100m from host to host. This though can generally be more than 100m without great losses.
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A ready made RJ-45 cat5 you can find in a computer store (with connectors attached of course):
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[[Εικόνα:Rj-45 cable connector.jpg]]
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The 4 pairs of thin cables consisting the RJ-45 cat5.
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[[Εικόνα:Rj-45 cable.jpg]]
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The connectors for the Rj-45 cable are from a see-through plastic material:
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[[Εικόνα:Rj-45 connector.jpg]]
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Connectors are attached to the rj-45 cables with a special tool (crimper):
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[[Εικόνα:Rj-45 crimper.jpg]]
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The procedure of how to attach a Rj-45 connector to its cable:
 
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[[Εικόνα:Rj-45 ready to crimp.jpg]][[Εικόνα:Rj-45 before crimp.jpg]][[Εικόνα:Rj-45 crimp1.jpg]][[Εικόνα:Rj-45 after crimp.jpg]]
 
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===  UTP cable howto ===
 
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This is the pinout of the normal and crossover utp.  
 
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For Ethernet devices without auto sense (e.g. 2 computers - usually older models) without a hub or switch between them, the utp ethernet cable must be  crossover. This means that on one side the utp cable and the connector follows the Normal pinout whereas on the other it follows the Cross pinout.
 
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Auto sense equiped devices (modern gigabit controllers, switches, bridges etc. ) the Normal pinout can be used in both ends of the cable.
 
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[[Εικόνα:Utp_normal_cross.png]]
 
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== Cables for Wireless Devices ==
 
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The cables used for wireless devices - networks are high quality coaxial  cables which vary in diameter, and loss in different frequencies. When using low quality coaxial cables 1-2m is the maximum acceptable length. On the other hand when using high quality cables you could have 30+m.
 
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=== Coaxial Cables ===
 
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==== Coaxial Cables Diameter ====
 
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There are 3 main categories: The thinnest ones like LMR100, Medium ones like RG58, RG223 and LMR200 and the Big ones like H1000, RG213, LMR400 and Aircom Plus.
 
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[[Εικόνα:Coaxial cables.jpg]]
 
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====Coaxial Cables Losses====
 
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If we put them in descending order from the best to the worst:
 
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Medium Cables: LMR200 > RG223 > > RG58
 
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Big Cables:AIRCOM PLUS > LMR400 > H1000 > RG213
 
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LMR200 has almost the same losses with RG213 of the next diameter category.
 
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=== Connectors for Coaxial Cables===
 
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==== Connectors Types (how it is attached to the cable)====
 
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There are 2 categories: The clamp and crimp ones. You need a special tool (crimper) to attach the last ones to the coaxial cable. The first ones on the other hand can be attached using regular tools. The crimped ones are the ones to prefer as they are attached easier and faster.
 
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[[Εικόνα:Crimps.jpg]]
 
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====Connectors Type ====
 
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=====UFL (The most widely used connector in minipci wifi cards) =====
 
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[[Εικόνα:Ufl.jpg]]
 
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=====MMCX (A little bigger than the UFL - also common in  minipci wifi cards)=====
 
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[[Εικόνα:Connector_mmcx.jpg]]
 
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=====RP-SMA (The small connector in most pci wifi cards)=====
 
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[[Εικόνα:Rp-sma lmr 100 crimp.jpg]]
 
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[[Εικόνα:Rp-sma male lmr 200 crimp.jpg]]
 
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=====RP-TNC (Common in linksys (and possibly Cisco) devices)=====
 
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=====Ν-ΤYPE (The most common connector for the out-door equipment - antennas cables etc.)=====
 
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[[Εικόνα:N-type lmr 400 crimped.jpg]]
 
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[[Εικόνα:N-type lmr 400 clamp.jpg]]
 
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[[Εικόνα:N-type lmr 200 crimp.jpg]]
 
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====Male-Female ====
 
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For all the above types there are the corresponding male and female connectors. The way to tell the male from the female is that male connectors are composed of 2 pieces whereas the female are in one piece.
 
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[[Εικόνα:Male_female.png]]
 
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===Pigtails===
 
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The pigtails are short in length cables  with different types of connectors on their sides. They are generally used to connect wifi cards (which are usually equipped with really small conectors like ufl,mmcx,rp-sma) to big connectors (N connectors) used in out-door wifi devices (antennas and cables).
 
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[[Εικόνα:Pigtail.jpg ]]
 
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[[Εικόνα:Pigtail rpsma.jpg]]
 
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[[Category: Hardware]]
 
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[[Category: Φτιάξ'το μόνος σου]]
 
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[[Category: Ενημερωτικά Κείμενα]]
 

Αναθεώρηση της 04:26, 24 Οκτωβρίου 2008

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