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

[Robert Hudson]

Hi Ross,

Power loss, reported as -19dBm.

Having asked the DC operator to send me photos of the cross-connect
connection (because I have a photo of cross-connect connections in another
area where they've been plugging SC cables into SCA sockets), I don't have
photos, but the power loss is now measuring -12dBm.  Which my switches now
report as normal.

Regards,

Robert

On 28 August 2015 at 15:47, Ross Wheeler <ausnog at rossw.net> wrote:

>
> 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.
>>
>
> 19dBm, -19dBm or 19dB?
>
> Loss would typically be measured in dB
> Power would typically be expressed in dBm
>
> Most fibre stuff I've seen seems to transmit from a low end of -10dBm
> (100uW) to +6dBm (4mW).
>
> 19dB does seem somewhat excessive to me, but then I'm not an expert in
> this field!
>
> Most receivers I can quickly find specs on seem to indicate they are happy
> working on receive power levels from 0 to -20dBm or so.
>
> R.
>
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