[AusNOG] Acceptable dBM loss over SM cross connect in a datacentre

[Paul Wallace]

Not to mention being accurately calibrated back in the factory in the first place

Sent from my iPhone

On 29 Aug 2015, at 11:55 am, Lincoln Dale <ltd at arista.com<mailto:ltd at arista.com>> wrote:


On Fri, Aug 28, 2015 at 12:20 AM, Paul Wilkins <paulwilkins369 at gmail.com<mailto:paulwilkins369 at gmail.com>> wrote:
Not at the physical layer, no. Seems a missed opportunity this wasn't incorporated in the BFD protocol. It'd be a natural mix of synergy, control plane, link reliability, and TX power. I'd be tempted to post an RFC myself but for other irons in the fire etc.

You're making the assumption that transceivers both
 (a) accurately measure what they receive (hint: look at the +/- on the spec and be amazed at what the +/- is),
 (b) know their transmit power.

Both are false assumptions.


Lincoln Dale | ltd at arista.com<mailto:ltd at arista.com> | +1 408 547 5782 |  +1 650 391 8376
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