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Return to E1/T1 Interface.

Why not TDMoIP / CESoIP?[edit]

Usual E1/T1 over IP protocols use generic frames over IP transfer that makes 2 megabits constant rate with up to 8000 packets per second. That approach:

Fur such kind of integrations we prefer to have our own agent software on-site with hardware E1/T1 interfaces.

icE1usb[edit]

IcE1usb-usb side.jpg

We have chosen Osmocom icE1usb as a primary interface for our projects for several reasons:

User manual can be found here.

Driver installation[edit]

We maintained Osmocom E1D in our Debian repository (amd64, arm64). It has no modifications so you can use any source of packages you want or build from the sources.

sudo apt install osmo-e1d

Driver configuration[edit]

/etc/osmocom/osmo-e1d.cfg[edit]

log syslog daemon
e1d
 interface 0 icE1usb
  usb-serial [interface serial number]
  line 0
  line 1

More information about logging section can be found here, here and here.
(If you care about configuration file format, please check the sources here).

How to find a serial number of connected icE1usb:

sudo lsusb -d 1d50:6145 -v 2> /dev/null | grep iSerial

Reload a service:

sudo systemctl restart osmo-e1d

You can also test your configuration from the command line:

sudo osmo-e1d -c /etc/osmocom/osmo-e1d.cfg

Issues with the second E1 port[edit]

``Please note that on many XHCI host controllers there seem to be implementation flaws in the XHCI host controller firmware preventing the activation of both icE1usb ports simultaneously. The XHCI controller firmware erroneously claims that there is insufficient bus bandwidth. However, the same icE1usb hardware/firmware works perfectly fine with OHCI, UHCI and EHCI host controllers. See https://osmocom.org/projects/e1-t1-adapter/wiki/Isochronous_USB_Issues for a user-maintained list of USB hosts / controllers and whether or not they work with two E1 ports``