| osmo-e1-hardware - Collection of various E1/TDM hardware projects |
| ====================================================================== |
| |
| This repository hosts three different sub-projects: |
| |
| * osmo-e1-xcvr (E1 LIU + magnetics) |
| https://osmocom.org/projects/e1-t1-adapter/wiki/Osmo-e1-xcvr |
| * osmo-e1-tracer (fully integrated passive raw bitstream tracer) |
| https://osmocom.org/projects/e1-t1-adapter/wiki/E1_tracer |
| * osmo-e1-tap (passive high-impedance tap) |
| |
| == osmo-e1-xcvr == |
| |
| This is a simple hardware project that aims to generate a reusable module |
| for interfacing E1/T1/J1 lines from various custom FPGA/CPLD/microcontroller |
| projects. |
| |
| The board contains tranformers, the analog circuitry, the LIU (line interface |
| unit), an oscillator as well as an integrated transceiver chip. |
| |
| It exposes the control interface (SPI) as well as the decoded synchronous |
| Rx/Tx bitstreams each on a 2x5pin header. |
| |
| Framer, Multiplexe,r HDLC decoder or anything like that is out-of-scope for |
| now. The idea relaly is to provide an interface as low-level as possible. |
| |
| One of the ideas is to create a "soft E1" interface, where the Rx/Tx bitstreams |
| are interfaced with the SSC of an AT91SAM3S and subsequently passed into a PC |
| via USB. The 2Mbps signal is very low-bandwidth, so that a pure software |
| implementation should be absolutely no problem for todays computing power. |
| |
| See https://osmocom.org/projects/e1-t1-adapter/wiki/Osmo-e1-xcvr for more details |
| |
| |
| == osmo-e1-tap == |
| |
| This is a small passive board that allows you to perform high-impedance tracing on an E1 |
| or T1 line. |
| |
| |
| == osmo-e1-tracer == |
| |
| This is a fully integrated design that allows you to obtainm bi-directional high-impedance |
| bitstream E1 traces. It features an iCE40 FPGA with USB + E1 cores from Sylvain Munaut, |
| as well as two E1 LIUs. |
| |
| See https://osmocom.org/projects/e1-t1-adapter/wiki/E1_tracer for more details. |