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

[Matthew Moyle-Croft]

What kind of optic?  Assume LR in a DC on SM.  10GBaseLR has an optical
budget less than 10dB, so -19dBm should be triggering low power alarms.
Inside a building I'd expect to see under 4dB loss - will depend a lot of
patching (is it a single cable or lots of bulkheads as you pass through a
MMR or many of them).

(SMF is 0.1dB per Km with splices, patches more (usually considered 1dB) -
hence why inside a building is going to be a bit higher if lots of
patching).

I'd fault whoever is providing you the patch.

MMC

On Thu, Aug 27, 2015 at 10:30 PM, Robert Hudson <hudrob at gmail.com> wrote:

> Hi all,
>
> What level of loss should I accept on a single mode cross connect in a DC?
>
> I have a dark fibre link measured as <4dBm end-to-end over a 13km run, but
> am seeing 19dBm switch-to-switch in both directions.
>
> Thanks!
>
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