Shenzhen E-Lins Technology Co., Ltd.
CDMA Router, M2M WiFi Router with WiFi GPS DIO
CDMA Router, M2M WiFi Router with WiFi GPS DIO
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E-Lins CDMA mobile wifi routers covers 2G CDMA1x and 3G CDMA2000 EVDO.

For single sim CDMA router, the main models are H685, H685m, H820. For dual sim CDMA routers, the main models are H700, H750, and H720.


Sim Slot Quantity

Module Quantity

Ethernet Port





WAN RJ45 * 1

LAN RJ45 * 1

With serial port and DIO port for option




WAN RJ45 * 1

LAN RJ45 * 1




WAN RJ45 * 1

LAN RJ45 * 3

With serial port and DIO port for option




WAN RJ45 * 1

LAN RJ45 * 4

Can built in battery;

With serial port and DIO port for option




WAN RJ45 * 1

LAN RJ45 * 4

Can built in battery;

With serial port and DIO port for option

CDMA lte wifi router adopts high-performance 32-bit industrial-grade ARM9 communications processor. With embedded real-time operating system as software support platform, the system integrates a full range of communication protocols from logical link layer to application layer, supporting static and dynamic routing, PPP server and PPP client, VPN (including PPTP and IPSEC), DHCP server and DHCP client, DDNS, firewall, NAT, DMZ host and other functions.

CDMA mobile wifi wireless router provides users with a safe, high-speed, stable and reliable wireless routing network. At this stage the construction of CDMA network is mature, CDMA data communication is stable, the data transmission speed is quick, the data quantity is a big and excellent point. Downlink speeds up to 150kbit / s or so, uplink speeds up to 75kbit / s or so. The cdma wireless router now is widely used in finance, water conservancy, environmental protection, electricity, postal services, meteorological and other industries.

Typical Topology

CDMA Router Typical Topology

Typical Topology

Industrial CDMA Router Specification


Compatible Mobile Networks


CDMA2000 EVDO Rev 0, Rev A, Rev B

Cellular Frequency

CDMA1x/EVDO: 800/1900Mhz, option for 450Mhz;



Rev B: 14.7Mbps downlink, 5.4Mbps uplink
Rev A: 3.1Mbps downlink, 2.4Mbps uplink

Rev O: 2.4Mbps downlink, 153.6kbps uplink 

Notes: the bandwidth is peak value. Real value depends on carrier network support.

Network and Band Lock Feature (Option)

Default is unlocked, can use this feature to lock

Main Features and Performance

USB Host


SMS and SMS/Voice Control and Alarm

Receive and Send the SMS;

WAN Cell APN configuration via SMS;

SMS/Voice Control and Alarm. SMS or Call to control router to be online, offline, reboot, signal and status monitor; SMS is default feature, Voice is option

GPS (Option)

GPS feature

DTU (Option, only for H685)

With DTU feature (Serial to Cellular Gateway feature, RS232 or RS485 port option).


Serial Baudrate: 300bps, 600bps, 1200bps, 2400bps, 4800bps, 9600bps, 19200bps, 38400bps, 57600bps, 115200bps;

Serial Parity: none, even, odd;

Serial Databits: 7, 8;

Serial stopbits: 1, 2;

Serial flow control: none, hardware, software;

Mode: Server (up to 4 server centre, can OEM to be more), Client;

Protocol: TCP, UDP ;

Heart Beat : Yes;

VPN (option)

PPTP, L2TP, IPSec, GRE, Tunnel(PPTP server, PPTP client, L2TP client, IPSec client, IPsec server), OpenVPN is option

OpenWRT (Option)


VRRP (Option)



Static Route;

Optional for Dynamic Route (BGP, BGPD, OSPF, Zebra, Rip);


Support V1, V2. V3


Support multi-LAN IP address, support two IP address


Optional,802.11b/g/n; 150Mbps default.

Can be used as AP and client;

Frequency from 2.4GHz to 2.483GHz,Access Points,Routers and Gateway Server Applications, wireless up to254 PC users

Fail Over Redundancy (network Backup feature)

Auto-dial feature, keep alive link;

LCP, ICMP check;

Built-in watch dog;

Cellular (2G/3G/4G), RJ45 WAN (xDSL, DHCP, Fixed IP), WiFi client three line redundancy;

Two H685/H685m dual sim same network(Network1+ Network1);

Two H685/H685m dual sim two network (Network2+ Network 2);

Two H685/H685m dual sim dual mode network (WCDMA+CDMA2000, WCDMA+LTE, CDMA2000+LTE);

Cold Backup is default, Hot Backup is option;
Cold Backup=WAN RJ45 and Cellular WAN not online at the same time. One line online and the other line standby, switch freely with triggers;

Hot Backup=WAN RJ45 and Cellular WAN are online at the same time. Data goes the main line, and switch to the other line. Hot Backup switch time is shorter than Cold Backup.

POE (only for H685)

POE for LAN/WAN RJ45 (use with POE adapter)

Firmware update

support firmware update locally or remotely (LAN, WiFi and OTA WAN)


local and remote



DHCP Server



DNS proxy;

Optimized EMC design;

Real-time clock (NTP, support update with defined hours);

WAN/LAN/Memory statistics;

Local/remote profiles backup and retrieve;


Management System




Ethernet RJ45LAN1 or 2

Ethernet RJ45 WAN*1


2 antenna for Wi-Fi (detachable,SMA interface * 1, Internal *1)

3antenna for Cellular and GPS (detachable,50Ω SMA female interface), Cellular supportdiversity receiving (MIMO) option


H685: SYS*1, VPN*1, Cell Signal*1, Cell*1, WAN*1,LAN*1, WiFi*1

H685m: SYS*1, Cell Signal*1, Cell*1, WAN*1,LAN*1, WiFi*1




1 console port

Serial port (only for H685)

RS232 or RS485 built-in terminal block interface

IO Port(option, only for H685)



Easy to use and management;

Web/Telnet/SSH/CLI, support remote management



RMS (Remote Management System)

At command


UIM/SIM Card Slot

Support1.8V/3V UIM/SIM cards, one sim card slot

DC Jack

Two types of input jack for DC

2.5mm DC jack * 1

Terminal Block * 1


Power supply

DC5V-50V / DC5V-60V, typical DC 9V1A or 12V1A,12v CAR USE;

DC5V~40V is the default, DC5V~50V is the option


Idle: about 100mA@12VDC

Communication: about 260mA@12VDC


Device Management

WEB interface (Internet Explorer v6 or Later; Mozilla Firefox v1.5 or Later, or other Java-enabled Browsers, Chome, Opera, Sarafi, etc.)

Minimum System Requirements

Windows, Linux, Mac OS, IOS, Symbian, Android, other OS support web browser;

Network Interface Card


Operating Temperature

Storage Temperature: -40 ~ 85°C

Working Temperature: -30 ~ 75°C


95% Maximum (Non-condensing)


H685 Model

PCBA: 96mm x56mm x14mm

With case:100mm x60mm x21mm


H685 Model

220g (not including the antenna)
330g (including the antenna)
650g (including all accessories, without package)


Metal Gray-Black, OEM is available



1 Year default.Option extends to 5 years maximum.

Package Contents

H685/H685m SeriesCDMA Router

Ethernet Cable

Power Adapter


Others depends on option features

What to do when M2M WiFi router network slows down suddenly?

Sometimes the speed of M2M industrial wireless router's internet slows down suddenly while the wired speed is all normal and ruled out. Since there is nothing wrong with line or hardware, then you should be considered whether the channels conflict.  Then E-Lins will teach you how to deal with it.

1. HTTP:// enter into the Tp-link modify Settings page, access with the WiFi password.

2. Click on wireless Settings-basic settings, and then you will see your wifi name and the channel you are using is whether automatic or optional. There are a total of 1-13 channels to choose from, but which channel should be chosen to make WiFi work best?

3.Click on the WDS option to find a scan option below to see which channel your nearby WiFi are using. The best WiFi channels are 1, 6 and 11. These three channels do not interfere with each other and all have strong penetration. If most of your neighbors are using 1, choose 6 or 11 to avoid using one channel at a time.

4. Search the nearby WiFi signal, and select the nearest WiFi, write down its name (public WiFi accounts of Mobile or Unicom are not considered). For example, the closest to me is Liuxuhao and 123, they are respectively using 6 and 11. So I should change my channel to 1, then the download speed will go back to the 1M.

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