Many friends have mentioned how to solve IP address conflicts, what is the difference between LAN port and WAN, how to superimpose multiple bandwidths, and so on.
1. What is the difference between LAN, WAN and WLAN ports?
Many friends do not have a clear understanding of the purpose of the LAN port and WLAN, especially when doing router bridging, the connection and setting of the WAN port and LAN are easy to be confused.
1、LAN 局域网(Local Area Network)接口，通俗讲就是路由和用户之间网线口；
2、WAN 广域网(Wide Area Network)，通俗讲就是和猫外部网连接的网线口；
3. WLAN wireless LAN (Wireless LAN), data is transmitted through electromagnetic waves;
In layman's terms, the WAN port is an external interface that deals with carriers and higher-level networks.
LAN and WLAN are internal interfaces, and internal computers, mobile phones, and pads are all connected to LAN or WLAN.
Second, the two connection methods of the bridge
1. Point-to-point connection
If multiple cameras are concentrated, you can connect the cameras to the switch.
If the cameras are scattered and far away, each camera can be equipped with a pair of bridges
2. Point-to-multipoint
If the angle between the position of the camera distribution and the monitoring center is less than 60 degrees, point-to-multipoint transmission can be considered. It can reduce the transmitter bridge and cost.
These two ways of bridge are used according to different scenarios, such as on the street, in the school, in the factory, in the office building, on the construction site, in the park, in the residential area, on the bank of the river, in the port wharf, and even in the forest, the Gobi Desert, etc. As long as there is a need to install a video surveillance system, you can use a wireless video surveillance system, which will use a bridge.
3. How to superimpose multiple bandwidths
Usually there may be two bandwidths at home, Unicom or Mobile, which may be charged and sent, but the network speed is not very good, don't be a pity, use it aggrieved, so what should I do?
1. Connect the two bandwidths to WAN1 and WAN2 at the same time.
2. The corresponding WAN port network parameters can be set for the two WAN ports respectively.
After the settings are successful, the two bandwidths can be superimposed.
Fourth, how to connect two crystal heads with a network cable
Many families decorate the home to the living room only buried a network cable, follow-up telecom broadband and IPTV, the two east and west lines are separated, to two network cables, only the split line processing, may need to divide a network cable into two.
Use a splitter, use a pair of splitters, if the office has laid a network cable and only one network port, to achieve two computers at the same time or one to connect to the computer and one to connect to the set-top box, you can use the splitter or switch:
5. How to select the power cord diameter
Assuming that the distance between four cameras and monitoring is less than 40 meters, each camera can separately deploy RVV2×0.5 power cord to the monitoring host and power supply with a small switching power supply; if 4 hemispheres or bolts, you can also choose 2 12V1A power supply or 1 12V2A power supply, 4 cameras adopt the way of parallel connection to take power, which is more wire-saving;
If the number of cameras is large, 8 cameras, then should use high-power 12V DC regulated power supply centralized power supply, at this time due to excessive current, must consider the voltage drop on the power line, under normal circumstances, 8 cameras of the system, the longest distance is not more than 40 meters, can be deployed RVV2 * 0.75 wire centralized power supply; if the 16 channel system centralized power supply, it is necessary to choose RVV2 * 1.0 power cord. The above is the selection of the power cord with a distance of no more than 40 meters from the camera to the monitoring host.
If the distance from the camera to the host is more than 40 meters, it is necessary to consider using 220V centralized power supply, and the voltage conversion to the camera end becomes 12V to supply power to the camera. Under normal circumstances, 220V power supply, as long as the system is not too big, less than 8 channels, within 200 meters of distance, you can choose RVV2 * 0.75 wire, if more than 8 channels, are high-power infrared cameras, you should consider using RVV2 * 1.0 power cord power supply, in addition, if the distance is farther, in order to ensure safety, it is best to use RVV2 * 1.5 wire.
6. How to solve IP conflicts in the LAN?
Regarding IP conflict, this question is asked by many friends in our weak current VIP technology group or in the background message.
IP address conflicts may often be encountered in projects, or there are many users in the local area network, and there is no reasonable management, IP conflicts may occur, so how to solve them?
This requires the use of a life signal:
ipconfig /release IP地 。
Then you need ipconfig /renew to get it again.
Let's take a look at how they work:
You can click "Start" → "Run" in the lower left corner, type: ipconfig /release, and click "OK" to release the IP address.
At this point, the network will be disconnected because the IP address has been released.
Click "Start" → "Run" again, type: ipconfig /renew, click "OK", and obtain the IP address again to resolve the IP address conflict.
At this point, the network will reconnect, but the IP address is no longer the same as before, and it is reassigned to an available IP address to connect to the network.
7. How to choose the camera lens
When doing surveillance projects, the choice of lenses is necessary.
Choice of camera lens size
The following suggestions are for the irradiation distance at which you can see the face clearly
8. Differences between access, hybrid, and trunk modes
When configuring the switch, there are three link types of Ethernet ports: access, trunk, and hybird, and many friends will ask how to use it.
Access port: can belong to only one VLAN and is generally used to connect to computer ports.
Trunk port: allows multiple VLANs to pass through and can receive and send multiple VLAN packets, which is generally used for switches and switch-related interfaces.
Hybrid port: allows multiple VLANs to pass through, receives and sends multiple VLAN packets, and can be used to connect switches or user computers.
access, trunk, and hybid are three port attributes;
A port with access can belong to only one VLAN and the port can be tagged.
A trunk port can belong to multiple VLANs, and all ports are tagged.
A port with the nature of HYBID can belong to multiple VLANs, and whether the port is tagged in the VLAN depends on the specific situation.