[AusNOG] TX/RX Conventions

[Tom Sykes]

This comes back to the assumption the port is "up" when the patching is done. For a number of reasons various carriers don't do that.

-----Original Message-----
From: Darren Ward (darrward) [mailto:darrward at cisco.com] 
Sent: Wednesday, 13 June, 2012 3:09 PM
To: Tom Sykes; ausnog at ausnog.net; andrew.warburton at aapt.com.au
Subject: RE: [AusNOG] TX/RX Conventions

Well the other provisioning point I would make is that I would assume anyone installing a metro type service would have a basic simplex light meter

Plug it into odd port and see if you have a light source, if not try the even port, no luck - then troubleshoot

-----Original Message-----
From: ausnog-bounces at lists.ausnog.net [mailto:ausnog-bounces at lists.ausnog.net] On Behalf Of Tom Sykes
Sent: Wednesday, 13 June 2012 3:06 PM
To: ausnog at ausnog.net; andrew.warburton at aapt.com.au
Subject: Re: [AusNOG] TX/RX Conventions

Hi,

When you've got access to both pieces of equipment and you check status lights then I agree - "swapping" the fibres until it works is probably acceptable. But when the fibre technician doesn't have access to the equipment (for example: it's 10km away in some other place with a number of patches in the middle), it helps to agree on a convention. 

What I've learned from the recent posts is that there doesn't seem to be one. 

FWIW, our convention is Odd port = TX Out, even = RX.

Cheers
Tom


From: Andrew Warburton [mailto:andrew.warburton at aapt.com.au]
Sent: Wednesday, 13 June, 2012 3:00 PM
To: john at netniche.com.au
Cc: Tom Sykes; ausnog at ausnog.net
Subject: Re: [AusNOG] TX/RX Conventions

Hey guys,
No need to get too complicated, this is just Layer 1 ie. Physical layer, no rocket science required.

Andrew
On 13 June 2012 13:45, <john at netniche.com.au> wrote:
On 13.06.2012 07:21, Tom Sykes wrote:
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.

Hi Tom,

I'm not aware of any convention other than the "flip it if it doesn't work and curse shutdown-by-default policies".

Cisco appear to place TX on the "left" of the optics (first port). The LC connector specification chickens out from making a distinction, and the SFP/SFP+ specifications also don't make a commitment (they allow for copper and single-fibre, after all).

>From a purely logical point of view, TX should be on the "first" port of a group. This is because it's difficult to test for the absence of a signal, so if only 1 of two ports has a signal on it that should ideally be the first one you try.

Otherwise, you're condemning engineers everywhere to a sequence of try port 1, nope, try port 2 - that's a 30 second gain in productivity for the industry each time they plug in a patch lead :)

John

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