On 07/02/2023 10:55, Simon Lockhart wrote:
On Tue Feb 07, 2023 at 10:45:48AM +0000, Paul Brennan wrote:
When considering both planning and operation, how much db is required to
operate a steady and reliable service once you take the light budget and
measured loss into consideration.
How long is a piece of string?
Depends how many knots you tie in it....
PON SFPs Optics rated for ? 31db (power budget) - What is the maximum
tolerated loss and still have a working service at the full speed, latency,
etc of the rated optic?
So my expectation here is that you can have 31dB of loss between sender and
receiver (taking into account fibre, splitter, splice and patch loss) and have
a reliable service.
I'd add to this 'be conservative', unless you want your engineers out
fixing stuff every time there is extreme weather. Fibre can move around
a bit after installation, e.g. when the fibre and sub-duct in which it
is installed have different coefficients of thermal expansion, or simply
because it gets knocked about by other installers, customers, etc. You
can easily loose a few dB here and there because some bend or spool ends
up under additional tension or a fibre is kinked slightly.
Ben.
