[c-nsp] Optical - rx power low warning

[Andrew Miehs]

10GBASE-ER/EW should only be 40km - ZR would be the longer distance ones.

Can you compare it to the light levels seen on the other end of the link?
The levels should be approximately equal.
Are you sure it is 20 miles and not a little longer? I would not be happy
running the link based on these light levels.
Are there any patch panels? Have all the cables been cleaned?


Based on Cisco's web site:
http://www.cisco.com/c/en/us/td/docs/interfaces_modules/transceiver_modules/installation/note/78_15160.html

SFP-10G-ER1: 10GBASE-ER, 1550-nm SMF
Max Distance: 24.86 miles (40 km)3
Tx: 4.0 (Max)
Tx: -4.7 (Min)
Rx: -1.0 (Max)
Rx: -15.8 (Min)
Freq: 1530 to 1565


-- Andrew


On Fri, May 1, 2015 at 12:57 AM, Mike <mike-cisconsplist at tiedyenetworks.com>
wrote:

> On 04/29/2015 11:22 PM, Sascha Pollok wrote:
>
>> Hi Mike!
>>
>> the Alarm status comes from the SFP. Togehther with the crapp chars I
>> would say some internal values got messed up maybe incl the thresholds for
>> alarms. -16dbm should be fine.
>>
>> Talk to the vendor.
>>
>
>
> Thats exactly what I'm planning next, thank you.
>
>
>
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