[AusNOG] TX/RX Conventions

[Matthew Moyle-Croft]

On 13/06/2012, at 9:46 AM, Andrew Warburton wrote:

> Hi Tom, if required for NBN;
> 
> When NBNco says these ports 3 & 4 are Tx & Rx it's usual to mean from NBNco perspective i.e. from NBNco equipment side facing the other party (Access Seeker) at the meetme room.
> Therefore port 3 is transmitting a signal out from NBNco to the Access Seeker and port 4 is receiving a signal in to NBNco from the Access Seeker 

Variables I've seen from arranging services on four continents:

Room: Do you have the correct location for meeting?  The correct room?  The correct vertical/rack/row?  (eg. Global Switch MMR1/North or MMR2/South?)  Is Level 1 the Ground level or the first floor?   Have you got the correct side of the rack?  
Physical: Are the ports labelled? Are they labelled horizontally, vertically, or some combo (eg.  2 above 1, 3 next to 1, etc)
Logical: Are the ports (a) what you should plug into (b) what the other side is doing?
XConnect: Is there a cross connect in the way that flips what you think is happening?
Optical: Are you SM,MM?  If SM are you 1550nm or 1310nm?   What speed?  1G, 10G?  
Configuration: Where to even begin?  Auto Neg on/off?  LACP?  

(Don't underestimate the "Room" one.  I've had a few examples where this wasn't obvious!)

MMC




> 
> Cheers, Andrew
> 
> On 13 June 2012 08:21, Tom Sykes <TomSykes at nbnco.com.au> wrote:
> 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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> Andrew Warburton
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> 
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