DLM two-way wireless transmission link module

• OFDM bidirectional wireless transmission link module
• Provide 2 wireless transparent 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 up to 30Mbps
• Modulation：QPSK/QAM16/QAM64 configurable
• Maximum transmit power：25±2dBm
• Receiving sensitivity：-103dBm(10MHz bandwidth)
• Support wireless link encryption and decryption
• At the same time, it has 2 bidirectional RS232 serial ports、Point-to-multipoint、relay、Mesh ad hoc network(Custom Edition)and other communication methods

Ethernet-1：Two-way wireless transparent transmission network port，4PIN 1.25mm spacing with buckle seat。
Ethernet-2：Two-way wireless transparent transmission network port，4PIN 1.25mm spacing seat or direct 4PIN soldering hole method。
Data-UART：Two-way transparent data serial port，TTL 3.3V level，3PIN 1.25mm spacing with buckle seat。
Main Antenna：Main Antenna Interface，IPEX seat。The antenna works in TDD transceiver mode。
Second Antenna：Auxiliary antenna interface，IPEX seat。Auxiliary antenna only receive but not transmit。When using DLM module communication，double take，send and receive。
Power：COFDM transmit interface，Support 7~25V wide voltage input，Maximum power consumption is less than 3.8 W。
USB：4Then send the network port data out，For DLM module configuration(default)。
Config UART：4Then send the network port data out，For DLM module configuration(optional)。
Switch：for driving external PA。
DLM module size 58*48mm(Dimensions that do not include interface components protruding from the edge of the board)，The height of the front device is less than 3.2mm，The back device height is less than 4.5mm，Thickness 1.6mm，Weight 31.5g。

External PA to increase transmission power

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

DLM networking application

    The use of DLM modules can realize long-distance two-way wireless data communication，Point-to-point two-way communication possible，It can also communicate bidirectionally in point-to-multipoint star network ，And relay and wireless ad hoc network Mesh mode(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，All nodes are in the same WLAN，All access nodes communicate with the central node to share wireless working bandwidth，The module will automatically distribute the system speed evenly。The data transmission from the central node to the access node is called downlink，The data transmission from the access node to the central node is called uplink。During point-to-point or point-to-multipoint communication，The downlink and uplink share wireless working 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，IP camera should be connected to the access node。The module will automatically and dynamically adjust the wireless transmission rate according to the carried business data stream，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，The wireless transmission distance can be increased by appropriately reducing the IP Camera video encoding bit rate。

peer-to-peer communication：

Star network：

relay mode：

Mesh wireless ad hoc network(Custom Edition)：