95 lines
3.8 KiB
Markdown
95 lines
3.8 KiB
Markdown
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osmo-e1-hardware - Collection of various E1/TDM hardware projects
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=================================================================
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This repository contains a variety of different projects related to
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E1/TDM hardware interfaces
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* `icE1usb` (fully-fledged USB E1 interface adapter)
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* `osmo-e1-tracer` (fully integrated passive raw bitstream tracer)
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* `osmo-e1-tap` (passive high-impedance E1/T1 tap)
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* `osmo-e1-xcvr` (E1 LIU + magnetics)
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https://osmocom.org/projects/e1-t1-adapter/wiki/Osmo-e1-xcvr
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icE1usb
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-------
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The Osmocom icE1usb project is an open source hardware, gateware and firmware
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project implementing a USB-attached interface for E1 circuits. Use this
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if you want to implement a system speaking to an E1 circuit, such as
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* a GSM BSC (using [OsmoBSC](https://osmocom.org/projects/osmobsc/wiki)) talking Abis/E1 to a GSM Base station,
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* using [osmo-gbproxy](https://osmocom.org/projects/osmo-gbproxy/wiki/Osmo-gbproxy) to convert classing Gb/E1 to Gb/IP
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* talking to legacy ISDN PRI equipment such as PBX, RAS servers, etc.
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* connecting legacy ISDN PRI equipment such as PBX, RAS servers, etc. to
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the [OCTOI comminity TDMoIP network](https://osmocom.org/projects/octoi/wiki)
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Depending on your USB host controller, it supports one or two E1
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circuits. Most host controllers can only support one E1 circuit.
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In order to provide a stable E1 clock reference, it contains a GPS disciplined oscillator.
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See <https://osmocom.org/projects/e1-t1-adapter/wiki/IcE1usb> for more details.
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Fully assembled units can be purchased at the [sysmocom
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webshop](https://shop.sysmocom.de/Osmocom-icE1usb-E1-interface-for-USB/icE1usb-kit)
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Check the `hardware/icE1usb`, `firmware/ice40-riscv/icE1usb` directories in this repository.
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The host software is provided either
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* via [osmo-e1d](https://osmocom.org/projects/osmo-e1d/wiki), or
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* via the [icE1usb DAHDI driver](https://gitea.osmocom.org/retronetworking/dahdi-linux)
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osmo-e1-tracer
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--------------
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This is a fully integrated design that allows you to obtain bi-directional high-impedance
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bitstream E1 traces. It features an iCE40 FPGA with USB + E1 cores from Sylvain Munaut,
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as well as two E1 LIUs.
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See <https://osmocom.org/projects/e1-t1-adapter/wiki/E1_tracer> for more details.
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Fully assembled units can be purchased made-to-order from
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[sysmocom](https://sysmocom.de).
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Check the `hardware/e1-tracer`, `firmware/ice40-riscv/e1-tracer` and `software/e1-tracer`
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directories in this repository.
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osmo-e1-xcvr
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------------
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This was a simple hardware project that aims to generate a reusable module
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for interfacing E1/T1/J1 lines from various custom FPGA/CPLD/microcontroller
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projects. Consider it part of an earlier R&D setup before icE1usb and
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osmo-e1-tracer were around.
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The board contains transformers, the analog circuitry, the LIU (line interface
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unit), an oscillator as well as an integrated transceiver chip.
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It exposes the control interface (SPI) as well as the decoded synchronous
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Rx/Tx bitstreams each on a 2x5pin header.
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Framer, Multiplexer, HDLC decoder or anything like that is out-of-scope for
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now. The idea really is to provide an interface as low-level as possible.
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One of the ideas is to create a "soft E1" interface, where the Rx/Tx bitstreams
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are interfaced with the SSC of an AT91SAM3S and subsequently passed into a PC
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via USB. The 2Mbps signal is very low-bandwidth, so that a pure software
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implementation should be absolutely no problem for todays computing power.
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See <https://osmocom.org/projects/e1-t1-adapter/wiki/Osmo-e1-xcvr> for more details
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Check the `hardware/e1-xcvr` directory in this repository.
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osmo-e1-tap
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-----------
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This is a small passive board that allows you to perform high-impedance tracing on an E1
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or T1 line.
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Fully assembled units can be purchased at the [sysmocom
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webshop](https://shop.sysmocom.de/E1-T1-tap-adapter/e1-tap).
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Check the `hardware/e1-tap` directory in this repository.
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