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DLK-D350
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RF Characteristics:
CDMA protocol: CDMA2000 1X Rev0
Frequency Range: 800M (TX 824 ~ 849MHz RX 869 ~ 894MHz)
Data Service: IS-707A
Data transmission rate: Up to 153.6kbps
Transmit and receive frequency spacing: 45MHz
(450MHz and other special frequency could be customized)
 
Power Consumption:
Input Voltage: DC5 ~ 25V (DC 9V Adapter as standard)
SIM card operating voltage: 3V/1.8V
Current consumption:
Talk mode: 120mA (average)
Sleep mode: 3.0mA (max)
Idle mode: 10.0mA (max)
 
Features:
Messaging content: support digital, voice, SMS and fax
Module reset: reset using AT command or power-down
Voice coding: EVRC, 13k QCELP
Maximum transfer rate: 14.4KBPS
 
Volume:
Without mounting holes and interfaces: 64 * 46 * 18.5mm
With mounting holes and interfaces: 78 * 66 * 18.5mm
Weight: 200g
 
Appearance:
Shell Package: good electromagnetic shield and metal housing, durable; anti-electromagnetic interference, excellent cooling capacity in high-temperature
Interface: standard RS-232/RS-485/TTL level, DB9 Interface
Antenna: 50ohm/SMA/Female
Environment:
Operating temperature: -40℃ ~+ 65 ℃
Automatic shutdown: > / +70℃
Storage temperature: -50 ℃ ~ 85 ℃
Humidity: ≤ 90%
Magnetic compatibility: Electrostatic Discharge Immunity Test Level: 3
Radio frequency electromagnetic radiation: Immunity Test Level: 3
 
     DLK-D350 CDMA DTU is developed by Dial-Link for a simpler and more practical CDMA communication solution. TCP / IP protocol stack is embedded to avoid embedding the protocol in client system while using common modules, which have not TCP / IP protocol. DLK-D350 CDMA DTU achieves reliable transparent data transfer by making use of the CDMA network.
 
     DLK-D350 CDMA DTU is characterized for aspect below: (1) both interface design and external servo circuit is simplified to suit harsh industrial site. (2) 3 level interface of RS-232, RS-485, TTL. (3) AT+i commands complete data communication between terminals, largely reducing development time and maintenance effort for users.
 
     Moreover DLK-D350 CDMA DTU is able to realize flexible access of various equipments, and simple installation. The product widely applies to data collection and transmission system of serial communication SCM, PLC, RTU, and IPC, etc. The product enables wired serial devices of customer to change to wireless network communication devices immediately, reducing input of system update.
 
◆ Built-in ZTE MC8331A wireless module, and embedded TCP / IP protocol stack
◆ Smallest in similar products, suitable for embedded integration
◆ Power saving mode, fit for mobile devices
◆ Able to update Firmware, to reach better transmission quality
◆ Able to realize flexible networking including point to point, multipoint, and VPDN line, support two modes of CLIENT and SERVER
◆ Support dynamic IP analysis based on DNS protocol, save money of renting fixed IP
◆ Heartbeat function based on P ING mode, keep the link flow  
◆ CDMA and TCP / IP technology highly integrated, to combine the Internet and CDMA network
◆ TCP / IP protocol stack built-in, support multiple protocols including TCP, UDP, DNS, PPP, DHCP, etc.
◆ Transparent transmission mode, able to replace data radio to update the system without changing the original system
◆ Support ALWAYS ONLINE mode, support dropped reconnect
◆ Support CDMA data transmission on line, telephone wake-up, remote reset and upgrade
◆ Short connection function in transparent mode, timing automatic release and re-connect of link
◆ Real-time dynamic refresh to solve wireless network "false connection" phenomenon
 
Power: automation system of urban distribution network, real-time monitoring and automatic power compensation, remote automatic power meter reading
Highway weather station: data transmission of temperature, humidity, wind direction, wind speed and spatial resolution on highway
Oil: real-time online detection of pipeline temperature, oil field data collection
Mine: real-time online mine detection
Finance: POS machine networking
Communication: dynamic environment monitoring of telecommunication room, line information inquiry of communication maintenance workers 
Public security: monitoring and dispatching of public security and traffic police vehicles, police mobile data (ID card, crime files, etc.) inquiry
Heat: real-time monitoring and maintenance of thermal systems
Industry: industrial remote sensing, telemetry, remote control information return
Weather: meteorological data acquisition and transmission
Water: hydrological monitoring
Life: real-time data acquisition and automatic control of gas regulator station, real-time monitoring and maintenance of water and sewage pipes, gates and water plants
Transportation: street surveillance, traffic flow information, CDMA / SMS / GPS monitoring and dispatching system of motor vehicles; monitoring and dispatching of bank armored cars and postal vehicles
 
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