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Offering dual mode CAT-M and NB-IoT, GNSS & cellular-based positioning engine, an MCU subsystem, and an integrated SIM (iSIM), this chip remains connected without taking up space. Add in Altair’s Small Antenna technology to get the market-smallest devices without compromising on performance. The LTE chip will be integrated into various add-on expansion boards from various third-party partners, according to PC World. Altair claims that its LTE chips are supported by multiple network providers across the globe. The firm also added that drivers and software required for its LTE chips to work on a Raspberry Pi are also ready for roll out. ALT3800 is a CAT-4 chipset supporting advanced LTE and LTE-A standards, setting the benchmark for high speed broadband access power consumption and cost. The GobiNet driver is instead very complex. The driver also exposes a control interface (e.g. /dev/qcqmi) and a network interface, but all the work that is done through the internal CTL service is done at kernel-level. So all client allocations/releases for the different services are actually performed internally, not exposed to user-space. The Digi XBee Cellular embedded modem is a pre-certified, ready-to-integrate communications device that offers 4G LTE Cat 1, Our quick-to-market embedded cellular modem allows OEMs to add wireless communication to products with a minimum of development time and certification expense. The Digi XBee Cellular embedded modem is the only embedded cellular modem on the market based on the.

CAT-4 High Speed Broadband Access Chipset

Architected to support the most advanced LTE and LTE-A standards, this chipset and software platform sets the benchmark for high speed broadband access performance, power consumption and cost.

The chipset includes a baseband processor and an RF transceiver as a highly optimized and system-tuned solution, together with a set of turnkey hardware and software reference designs, accelerating product time to market and minimizing development and carrier acceptance investment.

The ALT3800 chipset is used in a wide variety of devices, including tablets, netbooks, connected consumer devices, dongles, indoor and outdoor CPEs, mobile hotspots and M2M modules.

The ALT3800 leverages highly mature, carrier-certified and mass market deployed software as well as a comprehensive manufacturing and test solution ecosystem.

LTE

• 3GPP Release 9 and GCF Compliant
• FDD and TDD support with real time handover
• CAT-4 throughputs (150/50 Mbps DL/UL)
• Evolved Multicast Broadcast Service (eMBMS)
• Integrated VoLTE with HD voice support
• Integrated IMS and OTA-DM

SoC and Software

• 3^rd generation Software Defined Radio (SDR) architecture featuring high flexibility with extremely low power
• High performance CPU subsystem with native Linux and user space application support
• Pre-integrated high performance Wi-Fi routing stack/drivers
• Extremely low power consumption
• Robust, carrier certified and field hardened protocol stack and L1 software
• OS drivers – Android, Linux, Win 7/8.1, MAC OSX, Chromebook

RF Features

• System-level optimized and tuned RF transceiver
• Six RF ports supporting multiple FDD/TDD band combinations between 400 – 3800 MHz
• SAW-less TX operation
• Integrated LNAs

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Interfaces

• USB2.0/HS/OTG, HSIC, SDIO 3.0 host/device, I2S/PCM, RMII/RGMII, USIM, UART

Interference cancellation

• Altair’s proprietary INCA™ noise cancellation technology

Products

Related Resources

NCM (Network Control Model) is ethernet over USB protocol used by some fast speed USB modems/dongles.

For more information about different protocols used:

• ppp, see How to use 3g/UMTS USB Dongle for WAN connection
• qmi and mbim, see How to use LTE modem in QMI mode for WAN connection
• rndis, see How to use LTE modem in RNDIS mode for WAN connection

Modem Preparation

You need to switch modem to provide native NCM interface instead of Modem interface.

Please read about AT commands for your modem.

Once you've done - you can disconnect modem from the PC and connect it to the router.

Router Preparation

1. Install OpenWRT

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2. Complete steps OpenWrt Configuration

Router should be turned on and connected to the Internet to get the needed packages. Please refer to: Internet Connection.

Required Packages

To make use of NCM protocol, package kmod-usb-net-huawei-cdc-ncm and comgt-ncm are needed.

• usb-modeswitch - It will automatically issue a “special” command to the modem for switching it into the “Working” state

Optional Packages

1. Add support for PC Interface (ttyUSB0)

• kmod-usb-serial-option

3. Add support for FlashCard of your dongle - refer to: USB Storage

Installation

1. Install all the needed packages

If your have not enough space on your device - think of installing Rootfs on External Storage (extroot)

Another option is Hardware memory upgrade. Refer to your router Forum thread for possibility and instructions.

2. Reboot the router

3. Check that everything is OK and you got new device:

If you have no such device - try to find out what went wrong:

try dmesg to read kernel logs on USB init

or look info about USB devices and interfaces present in the system:

See Troubleshooting Section of this page for more information.

Configuration

Protocol Configuration

UCI is supporting NCM network protocol configuration.

The package comgt-ncm + modem specific driver must be installed to use NCM.

You can configure UCI manually using uci command line or text editor or with Luci package luci-proto-ncm.

If you are using option mode, an AT command setting the mode is sent to modem on every connection. Most of modems (at least all Huawei models) store this setting in internal flash. So on each connection Openwrt writes to modem flash. It is recommended to remove this option after a required mode is set once.

Network configuration

Now you should add new Interface to /etc/config/network

You can do this using the vi text editor, but if you're not comfortable with that, point your browser to 192.168.1.1 again, choose Network → Interfaces and click Add new interface.

Write wwan as the name of the interface and make it cover the wwan0 interface. Choose ncm as the protocol.

Insert a screenshot of LUCI add Interface.

Firewall configuration

The only thing that is left - Add wwan interface to WAN zone

Using LUCI:

• go to Network → Firewall, scroll down to wan and click the Edit button
• add a checkmark to the wwan box under Covered networks heading, click Save & Apply

Insert a Screen Shot from LUCI.

Additional Info

Some providers of the cellular internet use redirection to their pages for access activation, when you are connected first time.I.e. YOTA in Russia.

Normally this would be blocked by dnsmasq:

You have 2 options:

• Allow rebind responses RFC1918 (In LUCI goto Network → DHCP and DNS and uncheck Rebind protection checkmark)
• Add Yota.ru domain to Whitelist (In LUCI goto Network → DHCP and DNS and type in “yota.ru” without quotes to the Domain whitelist field.

Save & apply

Troubleshooting

My router is not detecting the dongle. What should I do?

Try the following commands:

It should respond with a message about your USB device is detected. If it does, issue the next command. If it doesn't, you might want to get help from the forum.

Then wait for the dongle to get issued an IP from your ISP.

I have to issue //usbmode -l// and //usbmode -s// every time I reboot my router to detect my USB device. How can I automate it?

Include the following codes into /etc/rc.local just before exit 0:

My modem doesn't reconnect after it loses the connection

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This script GitHub oilervoss will check the connection pinging a public IP and, under failure, it will send AT commands to the serial interface of the modem restarting it.

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To achieve continuous monitoring of the connection, it must be called recurrently through a cron job as:

I am using 'huawei_cdc_ncm' module and the /dev/cdc-wdm0 does not respond. What do I do?

This is probably related to ticket #18673 (https://dev.openwrt.org/ticket/18673).You should be able to use the modem by starting ndis manually by sending the following to /dev/ttyUSB1

It is possible to automate this task using hotplug. Below are some scripts fetched from http://forum.ixbt.com/post.cgi?id=print:14:59307&page=4. Do not forget to modify them to your needs. The scripts are for Huawei modems obviously.

/etc/init.d/ncm-network:

/etc/hotplug.d/usb/70-ncm-network

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Some modems does not reconnect after losing connection.Here is a connection check sh script which checks if it can ping remote servers with time intervals. If all pings fail, it tries to start the network by executing /etc/init.d/ncm-network start

If your SIM receives a voice call. It will downgrade to CS network which means you will downgrade into 3G mode.To avoid this, set the stick to use only PS network by creating `/etc/hotplug.d/iface/99-ifupwwan` file with following code.Make sure to modify it to use correct serial interface and correct AT command for your device.