Wires and Interfaces of Telecommunication Cable

First of all, the concept of male and female needs to be distinguished. Generally speaking, the interfaces provided by the equipment are female, and the plugs provided by the connecting cables used to connect to the equipment are male. Specifically to the network cable, routers, switches, 86 boxes to provide RJ-45 interface are female, crystal head are male.

Currently the most sold on the market is Category 5 cable (CAT5), as some users have gigabit demand, there are also super Category 5 (CAT5E), Category 6 cable (CAT6) sales. From the performance point of view, Category 6 cable has the best performance. From the price point of view Category 5 line price is the lowest.

From whether with shielding layer, can be divided into the following categories

UTP - Unshielded Twisted Paired Unshielded Twisted Pair cable (wire).

STP - Shielded Twisted Pair Shielded Twisted Pair cable (wire).

FTP - Foiled Twisted Pair aluminum foil shielded twisted pair cable (wire).

ASTP--Armour Shielded Twisted Pair Armored Twisted Shielded Cable (wire).

From the shielding effect, naturally ASTP shielding effect is the best, but also the most expensive

In summary, the most common for the general consumer market is Category 5 unshielded twisted pair cable (UTP CAT5)

For the network cable, from the device connection type, and divided into direct line and crossover cable, the connection between different devices with a direct line, the same device connection with crossover cable. The connection between your own computer and the router is made with a direct cable.

Speaking of direct lines and crossover lines, it is necessary to talk about the problem of line sequences

Line sequence is divided into 568A and 568B, from the purchase of the network cable, most of the direct line to do is 568B

568B line sequence, when you face the crystal head, copper contacts towards themselves, copper contacts in the lower, plastic shrapnel in the upper, from left to right are orange white, orange, green white, blue, blue white, green, brown white, brown

568A line sequence, when you face the crystal head, copper contacts towards themselves, copper contacts in the lower, plastic shrapnel in the upper, from left to right are green white, green, orange white, blue, blue white, orange, brown white, brown

That is, 1236 feet of 12 feet and 36 feet to adjust

Direct line is the crystal head of both ends are made into 568B or 568A, crossover line is made into 568B and the other end into 568A

From the above definition can be seen, 10M/100M network only need to pin 1236 four lines through to work properly, so the electrician in the construction, for simplicity, the network cable four and telephone two integrated into a network cable. In fact, this practice is currently feasible, but the future is not necessarily. Gigabit network 8 lines all to use.

Of course, as 10M/100M only need four lines of transmission, then the remaining 4578 can also be used to do POE power supply, which is the POE idle corner power supply, 45 feet to do the positive 78 feet to do the negative, you can get 48V, 13W power to the device. POE is generally used by enterprises, the family use of POE power supply is relatively small. POE later development also realized the function of data foot transmission power.