Re: CWDM question

[Christopher Costa <ccosta () gaikai com>]

If you're also doing 1310 does that mean there's a splitter cable inline
with the passive mux? If so, some are cheap and don't filter well outside
of the 1550 band.
On Dec 12, 2013 10:23 PM, "Keith" <kwoody () citywest ca> wrote:

> That is whats next. They took down the whole fiber instead of just the
> 1471 wave to test
> which killed transit...grrr..
>
> They say their tx/rx are within spec.
>
> Next is jumpers and sfp swaps I guess.
>
> Thanks.
> On 12/12/2013 6:40 PM, Sam Roche wrote:
>
> > If you have a CWDM optical power meter and light source, see if you can
> > measure the power level on the receiving end and verify that it is within
> > the spec of the SFP. Maybe it is a bad jumper or port on the 1471 receive
> > on their end or send on your end.
> >
> > If the two switches can be brought to the same location, you might also
> > want to connect them together using short jumpers, but make sure you have a
> > power meter to ensure you use the proper attenuators to avoid burning out
> > your optics. This would rule out your fiber and mux in case it an issue
> > with an appliance or SFP. I've had CWDM SFPs burn out for no apparent
> > reason twice now.
> >
> > *From: *Keith
> > *Sent: *Thursday, December 12, 2013 8:11 PM
> > *To: *nanog () nanog org
> > *Subject: *CWDM question
> >
> >
> > CWDM question
> >
> > Hi.
> >
> > We are doing a fiber link between us and another SP using CWDM.
> >
> > There is traffic flowing just fine at the 1310 wave, and have recently
> > added a
> > 1471 wave.
> >
> > On the 1471 wave there are some problems with it. From our perspective,
> > and we
> > have packet captured this, we are transmitting data to them, but they say
> > they
> > are not seeing anything. We are receiving from them, and while we show
> > that
> > packets are leaving our interface to them, they are getting nothing at
> > all.
> >
> > There are good light levels between the two locations and do not
> > understand
> > why they are not seeing traffic from us even though we are sending it.
> > Our packet
> > counters show we are transmitting to them and receiving from them.
> >
> > Is it possible to have RX and TX light and things appear to be ok, but
> > have the
> > RX on their side fubar in some way that it is not operating correctly in
> > that our
> > traffic is not reaching them?
> >
> > Thanks.