Getting Started

This page is a work-in-progress documenting what you need to do to get connected to the Community_TDMSS7_Network using an icE1usb.

Required Hardware

  • icE1usb hardware (contact for an OCTOI community special price of EUR 75 excl. VAT/shipping)
  • GPS antenna with SMA male plug (not included)
  • Some equipment with an E1 interface which you want to connect to the community network. Typically this is a PBX with E1/PRI/S2M upstream connection.
  • Some computer running Linux with a USB host controller to connect the icE1usb to. Note: Many USB XHCI host controllers suffer from bugs, restricting operation to only one of the two E1 ports, see Isochronous_USB_Issues for details. If you have a system with UHCI/OHCI/EHCI, use that.

Major steps required for setup

  1. Installing latest gateware and firmware into the icE1usb
  2. installing osmo-e1d
  3. requesting a connection with the OCTOI hub
  4. creating a config file for osmo-e1d

Installing latest gateware and firmware into the icE1usb

Please follow the instructions of the icE1usb user manaul

Firmware is available from

You will need dfu-util for performing the USB device firmware upgrade. Most distributions should have a package for this.

installing osmo-e1d

via packages

from source

As the protocol is still under fluctuation, the lastest patches may not yet be part of the master branch and hence not available as a binary package yet. If you want to try those, you will need to build osmo-e1d from source.


You will need
  • build-essential (gcc, binutils, make, ...)
  • autotools (autoconf, automake)
  • libtool
  • pkg-config
  • talloc
  • libosmocore
  • libusb-1.0

If using distribution packages, make sure you install the development packages (e.g. libtalloc-dev).


autoreconf -fi

installation (optional)

you can run osmo-e1d from the build directory, there's no strict need to install it.

If you do install it using the below instructions, the binary will be in /usr/local/bin or whatever is configured at configure time.

make install

requesting connection

Please contact laforge with your IP address and port number. Right now the protocol does not yet support dynamic IP addresses.

creating a config file

A minimal configuration file osmo-e1d.cfg looks like shown below. osmo-e1d looks for the config file in the current working directory from where you start the program, or you can specify it with -c e.g. osmo-e1d -c /path/to/my/osmo-e1d.cfg.

log stderr
 logging filter all 1
 logging color 1
 logging print category-hex 0
 logging print category 1
 logging print thread-id 0
 logging timestamp 1
 logging print file 1
 logging level e1d info
 logging level linp info
 interface 0 icE1usb
  usb-serial SERIAL_NR
  line 0
   mode e1oip
octoi-client HUB_IP HUB_PORT
 account USER_NAME
  mode ice1usb
  ice1usb serial-number SERIAL_NR

Where you need to substitute the upper-case terms as follows:

Variable Description
SERIAL_NR The serial number string (iSerial) of your device as visible for example using lsusb -v -d 1d50:6145. Should be a hex digit sequence like dc697407e74f292
LOCAL_IP The local IP address to be used by osmo-e1d for this line (can be for automatic)
LOCAL_PORT The local UDP port to be used by osmo-e1d for this line
HUB_IP The remot IP address to be used by osmo-e1d for this line. Provided by laforge
HUB_PORT The remote UDP port to be used by osmo-e1d for this line. Provided by laforge
USER_NAME The username provided by laforge

Checking status

osmo-e1d like most Osmocom software offers a cisco style command line interface called VTY. The VTY of osmo-e1d listens to localhost:4269, so you can use telnet localhost 4269 to reach it. Check commands like show line, show interface, show octoi-client and show stats for start.

GPS lock status

To avoid cycle slips, the GPS-DO needs a proper GPS fix

osmo-e1d> show interface 
Interface #0 (dc697407e74f2922), Driver: usb
 GPS-DO: mode=AUTO, fix=TRUE, state=TUNE_FINE antenna=OK, tune=2055/2078, freq_est=30720000

If things are good, the state should be TUNE_FINE and antenna=OK. If you see other output, please check your antenna setup.


There are a number of metrics exported by osmo-e1d that help you to analyze the performance and status of your setup.

See Monitoring_via_collectd or Monitoring_via_Grafana

Configuring your E1 device

You should configure your device (PBX, etc.) with settings along the following lines:

Physcal E1

  • channelized E1 with CRC4
  • clock master must be the icE1usb. Your device (PBX) must recover the clock it receives from icE1usb and use that clock to transmit towards the icE1usb. This is the classic mode of operation for user equipment attached to public networks.


  • Your PBX is in "User" role, the hub is "Network" role (just like connecting to public ISDN)
  • Layer 2: Q.921 (LAPD) on TS16
  • Layer 3: Q.931, ideally DSS1 (Euro-ISDN)
  • Country Code 49
  • Area code 030
  • Phone number: +49-30-xxxx-yyyy where xxxx has to be registered with laforge and entered into Phonebook
  • All other TS (1-15,17-31) can be used for both inbound or outbound channels
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Updated by laforge 3 months ago · 11 revisions

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