Principle of outdoor 4g router‌ is to connect operator’s 4G LTE network through built-in 4G module to realize remote wireless transmission data function. Specifically users insert SIM card into outdoor 4g router, then dial up network through operator’s 4G network such as TD-LTE or FDD-LTE, after connection is succeed, users can perform data transmission and high-speed Internet access with Ethernet port, Wi-Fi and serial port etc.

Outdoor 4g router usually consist of following main parts:

WIFI Interface‌: Allows to connect Wi-Fi device and expands coverage of the network.

Ethernet WAN port‌: Connect to external network and provide Internet access function.

Ethernet LAN port‌: Used to connect Ethernet devices to expand network coverage.

RS232/RS485/RS422 interface‌: Used to connect serial devices to achieve transparent data transmission.

Outdoor 4g router are widely used in various scenarios due to their high stability and ability adapt to harsh environments which include as below:

Smart Agriculture‌: agricultural monitoring, smart irrigation etc.

Smart life‌: smart home, smart security etc.

Public safety‌: emergency communications, video surveillance etc.

Smart grid‌: power monitoring, distribution automation etc.

‌Intelligent transportation‌: traffic monitoring, vehicle dispatching etc.

‌Environmental monitoring‌: meteorological monitoring, environmental monitoring etc.

Industrial automation‌: industrial control, equipment monitoring etc.

When outdoor 4g router connect to different networks or network segments, it can translate data information between these networks so that both parties can “read”, this make communication between different networks or network segments happen. Meanwhile it also has function of determining network address and selecting path, as well as filtering and separating network information flows. At present, outdoor 4g router have become the hub for connections within various backbone networks, between backbone networks and between backbone networks and Internet.

ICMP: Full name is Internet Control Message Protocol, it is a sub-protocol in TCP/IP protocol set, mainly used to transmit control information between hosts and outdoor 4g routers, including reporting errors, exchanging restricted control and status information etc..

PPPoE: Full name is Point-to-Point Protocol on Ethernet, users of broadband modems such as ADSL Modem can obtain personal authentication access to broadband network and create virtual dial-up connection for each user with this technology, so can connect to Internet with high speed. Outdoor 4g router has this function so can realize automatic dial-up connection of PPPoE, users connected to the outdoor 4g router can automatically connect to Internet.

DDNS: Full name is Dynamic Domain Name Server, usually called “Dynamic DNS”, because ordinary broadband Internet access uses dynamic IP address provided by ISP (Internet Service Provider). If a server is established in the LAN and needs to be accessed by Internet users, the dynamic IP address can be resolved to a fixed domain name through DDNS function of outdoor 4g router such as www.junhaoyue.com, so that Internet users can use the fixed domain name access intranet server.

DHCP: Full name is Dynamic Host Configuration Protocol. Outdoor 4g router can dynamically assign IP addresses to hosts in the network without requiring each user to set a static IP address and distribute TCP/IP configuration parameters with DHCP function, to legitimate network clients within the LAN.

NAT: Full name is Network Address Translation, outdoor 4g router can convert IP address inside the LAN into a legal IP address and provide Internet access with NAT function. For example, there is a computer with an IP address of 192.168.0.1 inside the LAN. Of course it can communicate with other computers on the intranet through this IP address, but if the computer want to access external Internet network, then 192.168.0.1 need to be converted with NAT function, it is a legal WAN IP address such as 210.113.25.100.