[AusNOG] TX/RX Conventions

[Tony]

I just assumed that everyone does what we do. Plug it in one way, get no link light, so switch TX/RX around, plug it in the other way. If you've still got no link you go and check other stuff and then find someone to blame for it not working (carrier not activating the port, configuration on device wrong, etc).

There's probably a standard for it somewhere. The below document has a system for labelling them, not sure if thats a "standard" or something that company/vendor uses as their way of doing things:

http://www.ampnetconnect.com/documents/WHITEPAPER_Fiber_Polarity_Simplified_090813.pdf

It appears TIA/EIA-568-B.1-7 might contain some relevant information.


regards,
Tony.




>________________________________
> From: Tom Sykes <TomSykes at nbnco.com.au>
>To: "ausnog at ausnog.net" <ausnog at ausnog.net> 
>Sent: Wednesday, 13 June 2012 8:21 AM
>Subject: [AusNOG] TX/RX Conventions
> 
>Hi,
>
>I'm interested to understand which conventions/standards (if any) are being used by operators to identify the TX/RX in fibre patching panels/trays - in environments like a meet me room or datacentre.
>
>For example, if someone is allocated ports 3&4 some operators seem to use the "low" port as the TX, while others use the low port as the RX. Also interested to understand whether the convention specifies whether the TX/RX is egress from the port or is specifying the signal into the port.
>
>Thanks.
>Tom
>
>
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