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:

• 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[edit]

We have chosen 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
• no need for the kernel driver
• suitable API for our purposes
• available at Sysmocom's web shop