View source for E1/T1 Interface ← E1/T1 Interface

== Why not TDMoIP / CESoIP? ==

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:
* not suitable for distributed sites with limited internet access
* makes constant parasite load on the servers
* requires delays to compensate jitters
* has issues with asynchronous-to-synchronous transition

Fur such kind of integrations we prefer to have our own agent software on-site with hardware E1/T1 interfaces.
* good timings driven by E1/T1 clock or GPS
* good framing due to synchronous composition on the site
* less traffic due to transfer only valuable demultiplexed information

= icE1usb =

[[Image:IcE1usb-usb side.jpg|300px]]

We have chosen [https://osmocom.org/projects/e1-t1-adapter/wiki/IcE1usb Osmocom icE1usb] as a primary interface for our projects for several reasons:
* good compatibility with big range of hardware hosts due to use USB
* in opposite to most of DAHDI interfaces it is in production
* open-source hardware design
* [https://github.com/osmocom/osmo-e1d open-source user-space driver], no need for the kernel driver
* suitable API for our purposes
* available at [https://sysmocom.de/products/lab/icE1usb/index.html Sysmocom's web shop]

[[https://ftp.osmocom.org/docs/latest/icE1usb-usermanual.pdf User manual]]

=== Driver installation ===

We maintained [[https://osmocom.org/projects/osmo-e1d/wiki Osmocom E1D]] in our Debian repositories. It has no modifications so you can shose any source of packages you want or build from the sources.

<pre>sudo apt install osmo-e1d</pre>

== Driver configuration ==

=== /etc/osmocom/osmo-e1d.cfg ===

<pre>
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
e1d
 interface 0 icE1usb
  usb-serial [interface serial number]
  line 0
</pre>