DLM two-way wireless transmission link module

• OFDM bidirectional wireless transmission link module
• Provide 2 wireless transparent transmission Ethernet ports、1Wireless transparent transmission TTL serial port
• Dual antenna：The main antenna works in TDD transceiver mode，Auxiliary antenna works in receive mode
• Wireless band：2401.5~2481.5MHz、1427.9~1447.9MHz、806~826MHz，Support automatic frequency hopping within the frequency band
• Configurable wireless bandwidth：1.4MHz、3MHz、5MHz、10MHz、20MHz，Air interface rate can reach up to 30Mbps
• Modulation method：QPSK/QAM16/QAM64 configurable
• Maximum transmit power：25±2dBm
• Receive sensitivity：-103dBm(10MHz bandwidth)
• Support wireless link encryption and decryption
• Support peer-to-peer、point-to-multipoint、relay、Mesh ad hoc network(Customized version)and other communication methods

Ethernet-1：Two-way wireless transparent transmission network port，4PIN 1.25mm pitch with buckle seat。
Ethernet-2：Two-way wireless transparent transmission network port，4PIN 1.25mm pitch seat or direct 4PIN soldering hole method。
Data-UART：Two-way transparent data transmission serial port，TTL 3.3V level，3PIN 1.25mm pitch with buckle seat。
Main Antenna：Main antenna interface，IPEX seat。The antenna works in TDD transceiver mode。
Second Antenna：Auxiliary antenna interface，IPEX seat。The auxiliary antenna only receives but does not transmit。When applying DLM module communication，Can be sent and received twice，You can also send and receive。
Power：Power input interface，Supports 7~25V wide voltage input，Maximum power consumption is less than 3.8 W。
USB：4PIN 1.25mm pitch seat，For DLM module configuration(default)。
Config UART：4PIN 1.25mm pitch seat，For DLM module configuration(Optional)。
Switch：For driving external PA。
DLM module size 58*48mm(Does not include the size of the interface device protruding from the edge of the board)，Front device height is less than 3.2mm，The height of the back device is less than 4.5mm，Plate thickness 1.6mm，Weight 31.5 g。

External PA increases transmit power

    The maximum transmit power of the DLM module itself is 25±2dBm，We also provide matching power amplifier modules(2W/5W/10W)to increase transmit power，Meet the application needs of different scenarios and distances。The figure below is a schematic diagram of the connection between the DLM module and the matching power amplifier module.。

DLM networking application

    Using DLM module can realize long-distance two-way wireless data communication，Point-to-point two-way communication possible，Point-to-multipoint star networking can also be used for two-way communication. ，As well as relay and wireless ad hoc network Mesh methods(Custom firmware)Two-way communication。During point-to-multipoint communication，If communication is required between two access nodes, it must be relayed through the central node，Each node is in the same wireless LAN，All access nodes communicate with the central node and share the wireless working bandwidth，The module will automatically distribute the system speed evenly。Data transmission in the direction from the central node to the access node is called downlink，Data transmission in the direction from the access node to the central node is called the uplink.。When communicating point-to-point or point-to-multipoint，Downlink and uplink share wireless operating bandwidth。When the module is shipped，The default setting is the ratio of uplink rate to downlink rate = 4:1。therefore，If the module is used to transmit IP Camera video data，The IP camera should be connected to the access node。The module will automatically and dynamically adjust the wireless transmission rate according to the business data stream carried.，When the amount of business data carried is smaller,，Under the same conditions, the transmission distance will be farther。therefore，When using the device to transmit IP Camera video data，You can increase the wireless transmission distance by appropriately reducing the IP Camera video encoding bit rate.。

peer-to-peer communication：

Star networking：

Relay mode：

Mesh wireless ad hoc network(Customized version)：