Hi,
Here please see our reply:
We should see alarm of low receiver power, but it have not. may be Accedian Metro NID setting a lower alarm <-25.85dbm, so can you please help to add some attenuation on the link, when the receive power in “Current digital diagnostics” showed like -27dbm, -28dbm,-29dbm, and then check if low power alarm occurred.
Hope it will be helpful to clarify the problem.
Look forward to hearing from you.

The Accedian NID does not change any of the alarm thresholds it is all handled by the Optocore SFP and that information should all be reported to the NID. I believe the NID does have the control over which of the information it passes on to the end management.

But from the alarms from the unit we are seeing the alarm clear, but never reported as raised .
1. NID Syslog, the SFP-A Receive Power Low alarms were cleared unexpectedly but the alarms are never raised.
1. Aug 28 07:40:32 NID30036/44574++IAJ# eventd: ALARM ID: 2.0001.20 (clear), SEVERITY: informational (nsa), MSG: SFP-A receive power low warning
2. Aug 28 07:40:32 NID30036/44574++IAJ# eventd: ALARM ID: 2.0001.18 (clear), SEVERITY: major (nsa), MSG: SFP-A receive power low alarm

For the alarm to be cleared it must have been raised and it is a reporting issue for this?
Also the diagnostics are showing the receive level as being outside the alarm thresholds but not reporting the alarm in the tables.
Current digital diagnostics
Temperature : 35 celcius
Laser Bias current : 26508 micro-amps
Supply voltage : 3281 milli-volts
Transmit power : -5.98 dbm
Receive power : -25.85 dbm
Thresholds and warnings
Receive power
High alarm : -2.00 dBm High warning : -3.00 dBm
Low alarm : -21.02 dBm Low warning : -20.00 dBm
NID30036/44574++IAJ#: alarm show status
Codes: E – Enabled, P – Present
Number E P Last Change Description
——— – – ————————- —————————————–
3.0003.01 Y Y 2013-08-16 02:43:06+00:00 PAA-NID30035-30036V0P0 PAA_CC_ALERT
3.0003.02 Y Y 2013-08-16 02:32:01+00:00 PAA-NID30035-30036V0P0 PAA_PL_ALERT
This unit is in a live network so we can’t get to add attenuation to it as a test bed.

Thanks for that, that explanation changes things and suggests it is more likely to be the NID at fault? Am I correct?
As for the number of units defective we have rolled out well over 100 NIDs with SFP’s fitted and I think this is the first time we have hit this alarm so I don’t know if it is a single faulty unit or a problem that could be present on all units…

At present, we can’t sure the problems come from our SFP or NID. If it is a single fault, we will provide replacement for you, if it is fault for all units, it is better to return this lot to us.
If there is any updates for this, please don’t hesitate to let us know. thank you.

We have now tested other units in our offices and seen the alarms being raised correctly with both Optocore and Apac Opto SFP’s. This leaves us confused if it is a SFP fault or NID fault.
If I got the whole unit shipped back (NID & SFP) would you be able to suggest any tests which could help to investigate further?

Yes we did use an Accedian NID for the tests and It is running the same software as the unit in the field.

Below is my test results using a standard SFP OP1305012, the only difference is that the customer is using a Compatible SFP RA50L1654.
At this stage, it’s reasonable to assume that the compatible SFP is at fault
G267-1277: SFP show SFP-B
SFP Information
Connector Type : LC
Vendor : OPTCORE
Wavelength : 1310 nm
Part Number : OSP1250-3120DCR
Serial Number : OP1305012
Vendor Revision : 1.0
SFP Present : yes
Diagnostics : supported
Calibration : internal
Thresholds : supported
Speed : 1G
Current digital diagnostics
Temperature : 39 celcius
Laser Bias current : 18132 micro-amps
Supply voltage : 3304 milli-volts
Transmit power : -5.16 dbm
Receive power : -20.32 dbm
Thresholds and warnings
Temperature
High alarm : 85 celcius High warning : 75 celcius
Low alarm : -5 celcius Low warning : 0 celcius
Supply voltage
High alarm : 3570 milli-volts High warning : 3470 milli-volts
Low alarm : 3130 milli-volts Low warning : 3150 milli-volts
Laser bias current
High alarm : 90000 micro-amps High warning : 80000 micro-amps
Low alarm : 2000 micro-amps Low warning : 4000 micro-amps
Transmit power
High alarm : -2.00 dBm High warning : -3.00 dBm
Low alarm : -10.00 dBm Low warning : -9.00 dBm
Receive power
High alarm : -2.00 dBm High warning : -3.00 dBm
Low alarm : -21.02 dBm Low warning : -20.00 dBm
G267-1277: alarm show status
Codes: E – Enabled, P – Present
Number E P Last Change Description
——— – – ————————- —————————————–
8.0000.04 Y Y 1970-01-01 00:00:39+00:00 No power supply on feed A
8.0000.05 Y Y 1970-01-01 00:00:39+00:00 No power supply on feed B
2.0001.21 Y Y 1970-01-01 00:00:47+00:00 SFP-A not present
2.0002.20 Y Y 1970-01-03 00:23:38+00:00 SFP-B receive power low warning
1.0001.01 Y Y 1970-01-01 00:00:47+00:00 Link down on Management port
1.0002.01 Y Y 1970-01-01 00:00:55+00:00 Link down on Monitor-1 port
1.0003.01 Y Y 1970-01-01 00:00:55+00:00 Link down on Monitor-2 port
1.0004.01 Y Y 1970-01-01 00:00:47+00:00 Link down on Client port
1.0005.01 Y Y 1970-01-01 00:00:47+00:00 Link down on Network port
####################################################################################
G267-1277: SFP show SFP-B
SFP Information
Connector Type : LC
Vendor : OPTCORE
Wavelength : 1310 nm
Part Number : OSP1250-3120DCR
Serial Number : OP1305012
Vendor Revision : 1.0
SFP Present : yes
Diagnostics : supported
Calibration : internal
Thresholds : supported
Speed : 1G
Current digital diagnostics
Temperature : 39 celcius
Laser Bias current : 18132 micro-amps
Supply voltage : 3304 milli-volts
Transmit power : -5.14 dbm
Receive power : -22.76 dbm
Thresholds and warnings
Temperature
High alarm : 85 celcius High warning : 75 celcius
Low alarm : -5 celcius Low warning : 0 celcius
Supply voltage
High alarm : 3570 milli-volts High warning : 3470 milli-volts
Low alarm : 3130 milli-volts Low warning : 3150 milli-volts
Laser bias current
High alarm : 90000 micro-amps High warning : 80000 micro-amps
Low alarm : 2000 micro-amps Low warning : 4000 micro-amps
Transmit power
High alarm : -2.00 dBm High warning : -3.00 dBm
Low alarm : -10.00 dBm Low warning : -9.00 dBm
Receive power
High alarm : -2.00 dBm High warning : -3.00 dBm
Low alarm : -21.02 dBm Low warning : -20.00 dBm
G267-1277: alarm show status
Codes: E – Enabled, P – Present
Number E P Last Change Description
——— – – ————————- —————————————–
8.0000.04 Y Y 1970-01-01 00:00:39+00:00 No power supply on feed A
8.0000.05 Y Y 1970-01-01 00:00:39+00:00 No power supply on feed B
2.0001.21 Y Y 1970-01-01 00:00:47+00:00 SFP-A not present
2.0002.18 Y Y 1970-01-03 00:25:48+00:00 SFP-B receive power low alarm
2.0002.20 Y Y 1970-01-03 00:25:48+00:00 SFP-B receive power low warning
1.0001.01 Y Y 1970-01-01 00:00:47+00:00 Link down on Management port
1.0002.01 Y Y 1970-01-01 00:00:55+00:00 Link down on Monitor-1 port
1.0003.01 Y Y 1970-01-01 00:00:55+00:00 Link down on Monitor-2 port
1.0004.01 Y Y 1970-01-01 00:00:47+00:00 Link down on Client port
1.0005.01 Y Y 1970-01-01 00:00:47+00:00 Link down on Network port
G267-1277:

Problems cleared, 2 of them failed, we will require replacement for them.