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sfp-i2c's Introduction

sfp-i2c [en]

what?

SFP transceiver use I2C to provide information about its manufacturer, the supported capabilities and more. Most modules also provide a diagnostic monitoring interface known as DOM, which can also be read.

how to interface?

There are different alternatives to interface a transceiver. I'm using a TwinGig Converter Module from Cisco, which allows to interface two SFP modules by the use of a PCA9544A.

specification

look into doc/

sfp-i2c [de]

wat?

SFP(+)-Module (und noch einige andere) haben eine I2C-Schnittstelle, um diverse Werte auslesen zu können. Standardmäßig vorhanden sind Informationen wie Hersteller, Teilenummer, Seriennummer und andere, zudem können auch Diagnoseinformationen vorhanden sein.

Interface?

Da gibt es verschiedene Möglichkeiten. Einerseits kann man natürlich direkt am SFP-Modul löten, dann gestaltet es sich aber mit der Weiterverwendung etwas schwierig. Ich verwende ein TwinGig Converter Module von Cisco, da erhält man direkt zwei SFP-Slots, zwischen denen man ebenfalls via I2C umschalten kann. Daher wird da wohl noch etwas Code dazu drin landen.

Mehr Informationen?

Benutze die SFF-Spezifikationen im doc-Verzeichnis

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