What is the difference between the production of twisted pair wires and the cross line of a straight line?

Twisted Pair wires have two connection standards: EIA/TIA 568B standard and EIA/TIA 568A standard.

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 the T568B line sequence.

Crossover line:

One end is connected in T568A line Order and the other end is connected in T568B line order.

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 in strict accordance with the Instructions [Use civilized terms]. Connect the computer and the transceiver with twisted pair wires, the twisted pair cable should be a crossover line connection method. The optical jumper connects the two transceiver. For example, the transceiver is a single mode, and the jumper is also a 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. The basic network connection of the optical transceiver is shown in.

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", "[Please use civilized terms] I", and "Out to Hub", which indicates using a direct connection.

★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.