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New Member

Facility High Rx Power on 10DME card

Hi all

I found message "Facility high Rx Power" on 10DME card. So, I need to know what is the root cause and reason to get the message. Please give me the idea or comment.

Thanks

V

Note: Please see the picture from attach file

21 REPLIES
Cisco Employee

Facility High Rx Power on 10DME card

so high power alarm on port-9.

current optical power level is -7.6dBm, its ok.

now check for threshold, this alarm is because of threshold.

go to card view - provisioning - optics threshold - click on "Alarm" at the bottom - click on refresh -- check threhsold for high rx power.

and change it :-)

New Member

Facility High Rx Power on 10DME card

Hi Sunil

Thanks with your great support.

So, i will let doing as your recommend. So, I confuse that why the problem is threshold. Is it possible to other problem? or do you need more information from me?

Thanks

V

Cisco Employee

Facility High Rx Power on 10DME card

no it looks ok, -7dBm on 10DME trunk is fine, maybe some fiber rectification work was done that improved opticla levels or maybe some one changed thresholds.

but for now we can just change threshold to clear alarm.

in power failure high put threshold as -4 something.

New Member

Facility High Rx Power on 10DME card

Hi Sunil

Thanks with your answer so, i will check with customer again. And if i have any update or issue i will update you again.

Thanks

V

Cisco Employee

Facility High Rx Power on 10DME card

ok

New Member

Facility High Rx Power on 10DME card

Hi Sunil

I got picture from customer (I copy in attach file)

You said clear alarm in threshold so, how to clear that ? and from the picture have anything wrong ?

Thanks

V

Cisco Employee

Facility High Rx Power on 10DME card

ok so in Provisioning - Optics Threshold - Alarm

instead of -8 infornt of port-9, make it -5 or -4 and than apply.

go on alarm tab and synchronize.

New Member

Facility High Rx Power on 10DME card

Hi Sunil

Why it should be -5 or -4 to apply? Have we any standard value to apply? Normally, what is the value to get ?

So, anyway i will let customer to change it.

Thanks

V

New Member

Facility High Rx Power on 10DME card

Hi Sunil

So, I may need some information from you that what is the main reason on this issue? why we have to adjust threshold? well, is it impact to customer service when i have change threshold?

So, normally threshold value from real value i fear that if i have change it, i may impact with customer service. Anyway, please give me the idea.

Thanks

V

Cisco Employee

Facility High Rx Power on 10DME card

main issue is that we have high Rx power alarm i.e. -7dBm.

so to clear this alarm you can change the threshold.

there will be no impact on the services, it is just threshold.

by default for 10DME threshold for high-Rx is -8dBm

and for low-Rx is -24dBm.

these thresholds are just for the alarms, changing them will not going to affect the traffic, feel free to do it anytime.

we have -7dBm current optical power it is perfect, so to clear this current alarm we are changing threshold.

thanks,

sunil

New Member

Facility High Rx Power on 10DME card

Hi Sunil

Let's me explain you as my understand,

So, our optical line (RX)  is -7.6 dBm but the threshold (Rx High) is  -9 dBm. It mean the threshold is setting high then the real optical signal output that is the reason why it have the alarm. correct?

Then, if i understand correct, i must to set threshold lower than -7.6 dBm such as -4 or -5 as you said. correct?

Thanks

V

Cisco Employee

Facility High Rx Power on 10DME card

yeah you are correct :-)

New Member

Facility High Rx Power on 10DME card

Hi Sunil

Thanks with your support

The last question, what is Rx (high) -9 dBm come from?  I may answer customer that why it is -9 dBm ? i may need to know what is the -9 dBm come from

Thanks

V

Cisco Employee

Facility High Rx Power on 10DME card

it is -8dBm threshold set on 10DME.

it is by default.

http://www.cisco.com/en/US/prod/collateral/optical/ps5724/ps2006/ps5320/product_data_sheet0900aecd803fc51a.html

in the link given above search for "DWDM Receive Side Optical Performances"

so by default we have a threshold of -8dBm high-Rx power and -20dBm for low-Rx power.

so now question is that from where we start getting -7dBm on trunk port, this we can ignore for now, as -7dBm is fine will not cause any issues.

so to clear alarm you can either change threhsold and put a 3 or 4 dB attenuator pad on trunk port of this 10DME.

i don't know your design, but we can even change VOA on add-drop cards.

but as i said -7dBm is fine, so just change threshold for now.

let me know what we need to do.

New Member

Facility High Rx Power on 10DME card

Hi Sunil

From the table, which one is relate with my card. Because I see OSNR, FEC Type, Pre-FEC BER, POST,FEC BER

that how i know my card is relate with  T_T

Thanks

V

Cisco Employee

Facility High Rx Power on 10DME card

i think the first two row.

check for "Input Power Sensitivity"

-8 to -20 dBm C-band 


New Member

Facility High Rx Power on 10DME card

Hi Sunil

So, I just change RX power high value in optics threshold > choose type "alarm" > and change to be -4 or -5, correct?

so, what is type "TCA" in optics thresholds? because i found the value is not match in alarm type.

Thanks

V

Cisco Employee

Facility High Rx Power on 10DME card

yeah thats correct.

TCA threshold is for threshold crossing alerts, if you go to Alarm tab -- filter -- click on "NA" option, that is for threshold.

these threshold alarms you will see in purple colour.

New Member

Facility High Rx Power on 10DME card

Still confuse about threshold crossing alerts. What is the main object for crossing alerts? is it difference with alarm ?

Thanks

V

Cisco Employee

Facility High Rx Power on 10DME card

TCA - Threshold crossing alert, they are also a kind of alarms but you can take them as a type of warnings.

Alarms - they are alarms indicating something is severely impacted.

so we have different thresholds under each card and ports for raising TCA and alarms.

New Member

Facility High Rx Power on 10DME card

Hi Sunil

I am clear....

Thanks with your great support

V

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