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Sfp-breakout » History » Version 4

laforge, 03/05/2019 01:52 PM

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h1. sfp-breakout
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The Osmocom SFP breakout board is exactly what the name implies:  A small break-out board for transceivers in "SFP":https://en.wikipedia.org/wiki/Small_form-factor_pluggable_transceiver form factor.
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You can use it for e.g.
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* transmitting your own signals / waveforms (not restricted to Ethernet or CPRI) over fiber optics. This is e.g. useful if you need galvanic isolation between digital circuits, or need long-distance transmission e.g. between FPGA LVDS interfaces.
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* attach some I2C adapter to the I2C pins of the SFP module in order to re-program it
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The SFP transceivers exhibit a symmetric/differencial interface for Rx and Tx.  Each of them is exposed as a pair
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of SMA connectors, using differential traces between the SMA connectors and the transceiver module.
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If you're interested in transmitting single-ended signals, please see the [[sfp-experimenter]] board instead.  It's like the SFP breakout board, but contains differential transmitter + receivers.
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h2. Schematics / Design files
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The schematics / design files are kept in git at https://git.osmocom.org/osmo-small-hardware/tree/sfp-breakout
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You can see the design discussion in #3313 and notes from board-bringup at #3524
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h2. Photos
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h2. Availability
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Not yet.
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h2. Errata
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h3. sfp-breakout v1
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The v1 boards that don't have the 3v3 connected on the bottom pin header.
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Eagle schematic and board file have been fixed in git, gerber files will only be re-generated once v2 is released.
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