Wireless Network coverage system knowledge points, wireless network coverage knowledge points

Wireless Network coverage system knowledge points, wireless network coverage knowledge points

1. What is AP?

A: AP-WirelessAccessPoint AP is a HUB in a traditional wired network and the most common device used to build a small wireless LAN. AP is equivalent to a bridge connecting a wired network and a wireless network. Its main function is to connect various wireless network clients and connect the wireless network to Ethernet to achieve wireless network coverage.

2. What is the difference between AP and AP "?

(1) thin AP (FITAP ):

• It is also called a wireless bridge and a wireless gateway, which is also called a "thin" AP.
• Thin AP: it cannot be configured, and requires a dedicated device (Wireless Controller) for centralized control and management configuration.
• "Controller + thin AP + router architecture" is generally used for wireless network coverage, because when there are a large number of APs, only the controller is used to manage the configuration, which will simplify the workload.

(2) fat AP (FATAP)

The so-called fat AP in the industry is also called a wireless router. A wireless router is different from a pure AP. In addition to the wireless access function, it generally has two WAN and LAN interfaces, supports the address translation (NAT) function, and supports DHCP server, DNS, and MAC address cloning, and security functions such as VPN access and firewall.

3. What is AC?

A: The Wireless AccessPoint Controller is a network device used to centrally control the controllable Wireless AP in the LAN. It is the core of a Wireless network and manages all Wireless aps in the Wireless network, AP management includes distributing configurations, modifying related configuration parameters, RF smart management, and access security control. (Currently, all AC and AP in the market can be managed by the same manufacturer)

4. What is POE power supply and POE switch?

Answer: POE (PowerOver Ethernet) is also known as a LAN-based power supply system (PoL, Powerover LAN) or an Active Ethernet, this means that, without any changes to the existing Ethernet Cat.5 cabling infrastructure, IP-based terminals (such as IP phones, wireless LAN Access Points AP, and network cameras) while transmitting data signals, it can also provide DC power supply technology for such devices. POE technology can ensure the security of existing Structured Cabling while ensuring the normal operation of existing networks, minimizing costs.

Public Application-POE switch: the POE switch can provide the power supply function for the other end of the network cable in addition to the transmission function of the common switch. Power supply + Data Transmission integration, no need to add a power supply module or POE Power Supply Module to power the device, a Cat.5 line to complete all the work.

5. The difference between the ''standard'' and ''nonstandard ''of POE Power Supply

• Standard poe: According to the IEEE 802.3af/at specification, it is necessary to detect the 25 k feature resistance of the powered end and perform a handshake. If the handshake succeeds, the power supply is provided. Otherwise, only data is transmitted ).
• For example, if the POE power supply device is inserted into the computer Nic, the computer NIC will not be burned down and can only access the Internet normally because the data can pass through.
• Non-standard POE: it is also called a strong supply type. The AC power supply is one-pass power supply. If the power supply end is not detected first, the power supply is 48 V or 54V without handshaking.
• For example, if the POE power supply device is inserted into the computer Nic, the computer can access the Internet normally, but the power supply is 48 or 54 V without negotiation, the device may be burned out.

The market is generally divided into 48 V, 24 V and 12 V output voltage (DC)

6. What software and hardware are required to deploy a wireless project?

Basic hardware: Router POE switch AC controller Wireless AP

High-end hardware: Firewall Router Traffic and behavior management bypass main switch floor switch POE switch AC controller Wireless AP

7. Is the higher the AP power, the better?

A: No. The higher the AP power, the higher the signal strength. Literally, it will lead you to misunderstandings. The stronger the signal, the better, however, if the signal is strong, both parties transmit the signal in the wireless network. Both the transmitting end and the receiving end transmit data to each other. If the sending end signal is too strong, it will inevitably affect the receiving end's return data, this will cause network transmission latency or packet loss.

In a common sense, when you talk to another person in a single space, the voice of the other person is too loud and your voice is too small, the other person will not be able to hear what you are talking about, thus affecting the quality of the call.

What are the key points and notes in a large-scale wireless project?

8. Key points from the engineering perspective:

(1) Design

The actual construction drawing determines the direction and position of the cabling. For example, concealment, damage to the building (Structural Characteristics of the building), and use the existing space to avoid power lines and other lines at the same time, necessary and effective protection requirements for cables and so on in the field.

(2) router location

Vrouters are generally used in underground Weak Current rooms (stay away from strong Electrical rooms to avoid strong electromagnetic interference). Note that the router is ventilated and kept dry. It is best to have a cabinet and put it together with the core switch.

(3) Position of the POE Power Supply Switch

The POE switch must be properly positioned in the middle of the AP to reduce cabling costs and shorten the distance from the switch to the AP.

(4) AP Location Selection

Select the central area of the scenario to deploy the AP points to the periphery. The coverage range of the AP must overlap to reduce the signal blind zone. The distance between the AP and the POE switch is no more than 80 meters (for example, the genuine ampu network cable)

(5) network cable laying

The network cable is used as the transmission carrier of network signals. During the laying process, pay attention to the line protection. Do not break the network cable or break it down. If necessary, use an iron pipe or place it in the roof tray. Special attention is given to the principle of high-voltage wires to reduce signal interference.

Considerations for practical debugging and later maintenance:

A. Internet and route: the outer network cable is connected in place to ensure the normal internet access conditions of the line, connect the route, and ensure that the route itself can communicate with the Internet normally. During construction, connect the main switch and the construction floor switch, ensure that the master network communication is normal.

B. debugging walkie talkie: In the debugging stage, a set of walkie talkie devices must be seconded to the mall to facilitate debugging.

C. In the construction and debugging phase, sufficient spare parts must be reserved for the AP, switch, network cable, and other construction and debugging hardware.

D. Construction Drawing: before each construction, ask the construction party to submit two construction drawings to our staff.

• Construction Network Topology: Requirements, detailed floor switch, route information and location, number of AP and other hardware and Connection Methods on each layer.
• Construction Equipment connection line identification diagram: Requirements, routing and switch and AP connection information, corresponding ports, etc. All connection lines are theoretically roughly the length of the network cable (including the path-switching-AP ).

E. Construction wiring and line label planning:

• Information identification record: Mac information record of AP points: When the construction party places an AP, it must record the floor number and location number of the AP and the corresponding Mac information (note the AP Number of the corresponding floor chart, for example: the format of mac information on the first floor is 1F-1: AC: 11: 22: 33: 44: AP ). This information is recorded in the shop construction drawing of the Word document floor according to the floor distribution or directly recorded in the free area on the side of the construction drawing, which is convenient for later maintenance and use.

Line Mark record:

• On the input and output lines of the vswitch, You need to specify the floor at which the ID or serial number is connected to the AP of the position number (note the AP Number of the corresponding floor chart, for example: the format of the first floor is 1F-1), and the incoming Internet line must also be wired: "Internet access needs to be indicated.
• Interconnection between switches on all floors: the source of the line connection head of the switch must be indicated by the ID or serial number. (Note the floor and switch labels, for example, switch 1 on the first floor, in the format of 1F-1 SW)

On-site check whether the installed AP is powered on and works properly:

After the construction is completed, all APs are inspected on site for normal power-on and normal status when power-on is in place: Green Indicators on the AP are on long, such as routes in place and running, you can use software to check whether the AP emits signals normally and accesses the internet.

If the above information is completely clear, it is not necessary for the construction personnel to be on site. If the above information is completely unclear, the construction personnel should cooperate with each commissioning.