Cabling of various network cables in the Network

The quality of twisted pair wires may affect the overall network performance during network construction. The connection of twisted pair wires between various devices is also very exquisite and should be connected according to specifications. This article mainly introduces the standard connection method of twisted pair wires and their connection methods with various devices. The purpose is to keep everyone familiar with the rules, improve work efficiency, and ensure the normal operation of the network.

Standard connection method for twisted pair wires

Twisted pair wire is generally used for star network wiring, each twisted pair wire through the two ends of the installation of RJ-45 connector commonly known as the crystal head) to connect a variety of network equipment. The standard connection method of twisted pair wires is not specified at will. The purpose is to ensure the symmetry of the cable connector layout, so that interference between cables in the connector can be offset.

Cat5e cables are the most commonly used network cables for network cabling. They are divided into two types: shielded and unshielded. If it is used outdoors, The Screen Shield is better. Generally, it is enough to use non-shielded five-category cables in the room. Because no Screen Shield is provided, the cables are relatively soft, but their connection methods are the same. In general, there are four pairs of lines twisted together in the cat5e category and marked with different colors.

Twisted Pair wires have two Connection Methods: EIA/TIA 568B standard and EIA/TIA 568A standard. The specific method is as follows:

T568A line Sequence
1 2 3 4 5 6 7 8
Green, white, orange, white, blue, white, orange, brown, white, brown
T568B line Sequence
1 2 3 4 5 6 7 8
Orange white orange green white blue white green brown white Brown

Express CONNECT: both ends are connected in T568B line order.

Crossover line: one end is connected in T568A line Order and the other end is connected in T568B line order.

When we create a network cable at ordinary times, if we do not follow the standard connection, although sometimes the line can be connected, but the interference between various lines within the line cannot be effectively eliminated, resulting in an increase in the error rate of signal transmission, this affects the overall network performance. Only by building standards can we ensure the normal operation of the network and facilitate the maintenance work in the future.

Connection Methods between devices

1. network card and network card

When the 10 M and M NICs are directly connected, no Hub is needed. Cross-line connection should be adopted.

2. Nic and optical transceiver module

Install the network adapter on the computer and set it up. Connect the transceiver to the power supply and operate it in strict accordance with the Instructions. Connect the computer and the transceiver with twisted pair wires; use optical jumpers to connect two receivers. For example, if the transceiver is single-mode, the jumper is also single-mode. When the optical jumper is connected, one end is connected to RX, and the other end is connected to TX. However, many optical modules now have the control function, which can be used for cross-line and direct-line connections.

3. Optical Transceiver Module and switch

Use a twisted pair to connect the computer with the transceiver.

4. Nic and switch

Twisted Pair wires are directly connected.

5. hubs and hub switches and switches)

Two hubs or switches) are connected through a twisted pair cascade. The distribution of the midline pairs of the twisted pair is different from that of the nic and hub. A crossover line is required. This situation applies to connections between hubs that do not indicate dedicated cascade ports. For convenience, many hubs provide a port dedicated to connecting to another hub, when cascade these hubs, the twisted pair wires should be connected through a direct connection.

How do users determine whether their own hub or switch needs cross-line connection? The main methods are as follows:

View Manual

If the hub requires a cross-line connection during cascade, it is generally described in the device manual.

View the connection Port

If the Hub does not require crossover during cascade, in most cases, one or two dedicated interconnect ports are provided and marked accordingly, for example, "Uplink", "MDI", and "Out to Hub" indicate that a direct connection is used.

Test

This is the most useful method. You can first create two twisted pair wires for testing, one of which is a straight line and the other is a cross line. Then, use one of the two hubs to connect to the two hubs. Observe the indicator lights corresponding to the connection port. If the indicator light is on, the connection is normal. Otherwise, use another twisted pair cable for testing.

6. Between a vswitch and a hub

The vswitch and the hub can also be connected in cascade mode. Level-1 connectivity is often an effective solution for connecting vswitches of different brands and between vswitches and hubs.

Another way to expand the number of ports is stack. Stacking is the quickest and most convenient way to expand ports, but not all switches support stacking. Dedicated stacking cables and dedicated stacking modules are usually required for stacking. In addition, the same group of stack switches must be of the same brand and must be set after the physical connection is completed to run properly. For the stacking method, I will not go into details here. Interested readers can refer to the relevant information further.