I have a fast ethernet FX connection running over a Nortel Optera 5200 which is showing packet loss.
I have a 7500 at one end and a 7200 at the other, both have NM-FE-FX PA's installed. We have a multimode fibre connection from the routers to a SRM card in the Optera. If we ping between the two routers we see packet loss. This seems to get worse if we increase the packet size. We have checked the optical levels on the fibre between the Optera's and these look ok. We have moved the router connections to another set of SRM cards on the Optera, but still see packet loss. I believe that the router fibre cards have been replaced too.
The product spec for the PA's states that they operate at a wavelength of 1300 nanometers. The Optera runs at 1310 nanometers. Is this an issue? Any ideas on what else I could check to resolve this issue?
You might already have resolved this, but if not, the following may help.
The NM-1FE-FX operates at 1300nm, however most devices incorporate a receiver that can handle a range of wavelengths (eg 1280nm - 1380nm) so connecting a 1310nm device to a 1300nm device should not be a problem.
Have you checked the power levels at the Rx of both the NM and the Optera SRM? The max Rx level at the NM input should be no more than -14dBm, but I believe the Tx from the SRM will be higher than this.
Thanks for this information. We currently have a case open with Nortel regarding this issue. From debugs that we have supplied them, they can see los which isn't quite long enough to flag alarms in the Optera alarm log. They have suggested adding attenuation to see if this resolves the issue. As you suggest the power levels seen at the NM may be too high which seems to tie in with Nortel's thoughts. I will let you know how we get on.
This is actually a pretty cool feature, i didn't even know it existed until I was looking for a solution to advertise a subnet (prefix in BGP talk), only if a certain condition existed. This is exactly what conditional advertisements does
j ai une question j ai achete un routeur cisco 887VA-k9 , je le configuré avec la configuration ci- dessous
si je le lier avec mon pc portable sur l un de ses ports directement ça marche toute est bien ( la connexion internet + m...
Attached policy provides CLI access to the Cisco 4G router over text messaging. Two files are in the attached .tar file:
2. PDF with instructions on how to load and use the .tcl file.