Hardware Projects » E1/T1 Hardware Interface (including icE1usb)

h1. e1-tracer

This page is about the "production" version of the setup described in [[ICE40_based_passive_tap]].

It is a bi-directional, high-impedance passive tap for E1 (PRI/S2M) tracing.  It traces both directions of a link simultaneously via two LIU (Line Interface Units) attached to an iCE40 FPGA with E1 framer + USB softcores.  

The traces are sent as isochronous USB transfers to the host PC, where they can (for example) be stored on disk.

h2. hardware 

Hardware files can be found at: https://git.osmocom.org/osmo-e1-xcvr/tree/hardware/eagle and are available as Open Source Hardware.

!e1_tracer.jpg!

h3. design files

We originally started with a prototype from an iCE40 evaluation board plus two osmo-e1-xcvr and one e1-tap as described in [[ICE40_based_passive_tap]].

Meanwhile, we have designed a fully integrated board.  Design files are part of the @osmo-e1-xcvr.git@ repository.

* Schematics:

** EAGLE: source:hardware/eagle/e1-tracer.sch

** PDF: source:hardware/e1-tracer_sch.pdf

* Board layout

** EAGLE: source:hardware/eagle/e1-tracer.brd

** PDF: source:hardware/e1-tracer_brd.pdf

** Gerber: source:hardware/gerber

* Bill of Materials

** gnumeric spreadsheet: source:hardware/e1-tracer_eBOM.gnumeric

** CSV export: source:hardware/e1-tracer_eBOM.csv

h3. gateware + firmware

The FPGA gateware and RISC-V softcore firmware are found in the @e1-recorder@ branch of @ice40playground.git@, see https://github.com/smunaut/ice40-playground/tree/e1-recorder

h3. availability

Fully assembled products based on this hardware are going to be made available by "sysmocom":https://sysmocom.de/

h2. software

The host software is found in the @e1-recorder@ branch of @ice40playground.git@, see https://github.com/smunaut/ice40-playground/tree/e1-recorder/projects/riscv_usb/sw

There are two related programs:

* @main@ - the program used to perform recordings and store them

* @dump@ - the program to analyze recordings