I thought Chromatic Dispersion is distance related. This is supposed to be SMF-28 DSF, the optics are supposed to be 80km (XENPAK DWDM 1600 ps dispersion tolerance). Do you need a DCU even when operating within that range? One of the links is only about 40-50km.
Is there a Cisco command to pull up the BER the optic is seeing? Thanks. On Tue, Jun 16, 2009 at 2:22 AM, Mikael Abrahamsson<[email protected]> wrote: > On Mon, 15 Jun 2009, FF wrote: > >> On a longer span (140km) link, I have the same setup, with two EDFAs. The >> input power comes in right around -24dbm. It tests clean mostly, but drops 2 >> packets out of 10,000 when empty. More traffic, more drops. I figured it >> was a strength problem (-24dbm is right at the edge). So went in with a some >> fiber cleaners and rejumpered everything. Got it down to -22dbm which should >> be well within the tolerances. If anything the problem got worse, not >> better. > > Is this link dispersion compensated? Otherwise that is most likely your > problem, 1GE rarely get chromatic dispersion (CD) problems, 10GE much more > so. > >> So now I have two spans, of drastically different lengths, both dropping >> packets directly related to the amount of traffic moving over them. Only BGP >> and static routes are on these. All are 6500/SUP32 or SUP720s running >> 12.22-33SXH5 or SXHI1. > > Which indicates a constant BER (bit error rate) which is consistant with CD > induced BER. > > -- > Mikael Abrahamsson email: [email protected] > -- FF _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
