From: phase90 (phase90@comcast.net)
Date: Thu Mar 18 2004 - 23:59:05 GMT-3
Sam,
This is 1 of the perils if doing your own fiber. 99.9% of the time
you'll be OK. In this case your fiber run distances may be fine but you may
have a "hot" transmitter on switch #1. The only way to tell for sure any of
this is to have 1 of these gents with the optical instrument that measures
all of the optical transmission levels and also the loss over the actual
fiber run you are connecting it to. Most sites
I have experience with never do this as it all costs $$$. Best of luck with
the issue. Please let us know
what it turns out to be.
Jerry
----- Original Message -----
From: "Sam Joseph" <samjoseph747@hotmail.com>
To: <KWygand@customonline.com>; <phase90@comcast.net>;
<ccielab@groupstudy.com>
Sent: Thursday, March 18, 2004 9:05 PM
Subject: RE: 3COM Question
> Thank you Guys.
>
> Will definitely take a look at the Fiber Patch?.
>
> ---Sam.
>
>
> >From: "Kenneth Wygand" <KWygand@customonline.com>
> >Reply-To: "Kenneth Wygand" <KWygand@customonline.com>
> >To: "phase90" <phase90@comcast.net>, "Sam Joseph"
> ><samjoseph747@hotmail.com>, <ccielab@groupstudy.com>
> >Subject: RE: 3COM Question
> >Date: Thu, 18 Mar 2004 20:42:20 -0500
> >
> >Jerry & Sam,
> >
> >Yes I've heard this before too. You should definitely take a look at
that
> >as well.
> >
> >Ken
> >
> > -----Original Message-----
> > From: nobody@groupstudy.com on behalf of phase90
> > Sent: Thu 3/18/2004 8:13 PM
> > To: Sam Joseph; ccielab@groupstudy.com
> > Cc:
> > Subject: Re: 3COM Question
> >
> >
> >
> > Sam,
> >
> > Is it single-mode fiber runs? If it is, it could be the
> > attenuation on the fiber is not
> > enough and the TX on port 1 on your Sw 1 is burning out the RX on your
Sw
> >2.
> > This happened to my network 1 time when someone ran a single-mode fiber
> >for
> > on a 1 meter jumper in between a router
> > and a Lightstream 1010. This is way out of spec and yet it ran fine for
> >over
> > 2 years until the PAM on
> > the LS1010 couldn't take it anymore and just burnt out. Worth a look.
> >
> >
> > Jerry
> >
> >
> > ----- Original Message -----
> > From: "Sam Joseph" <samjoseph747@hotmail.com>
> > To: <ccielab@groupstudy.com>
> > Sent: Thursday, March 18, 2004 7:26 PM
> > Subject: 3COM Question
> >
> >
> > > Hi Group,
> > >
> > > Wanted to throw in this and let me know, what you Cisco Experts think
> > about
> > > this.
> > >
> > > At my work, We have 3COM 9300 ( 12 port Fiber) switch. This Sw has
Layer
> >3
> > > capabilities. Upart from Default Vlan we created one more VLAN. Thats
> >all.
> > > No inter VLAN communication. We exhausted all 12 ports on Present Sw.
> > >
> > > We went ahead and bought another 3COM 9300 Sw. When Hooked the second
> > > switch, it was hooked as a cascading chain. Port 1 from Sw1 Connected
to
> > > Port 1 of Sw2 with Fiber Cross Over cable.
> > >
> > > It worked for some time. May be 6 --- 8 Months. Then the Port1 on Sw2
> > > Failed. We thought Port1 went bad on Sw2. We moved it to Port2. After
a
> > > Month Port2 on Sw2 Failed. We moved it to Port3 now. It has been
working
> > > Okay since then.
> > >
> > > This Morning, Port4 on Sw2 failed. We moved it to Port5 on Sw2.
> > >
> > > Is this a symptom of switch2 going bad one port at a time?. or there
is
> >a
> > > missing Link.
> > >
> > > Your Earliest Response will be Appreciated.
> > >
> > > ---Sam.
> > >
> > > _________________________________________________________________
> > > All the action. All the drama. Get NCAA hoops coverage at MSN Sports
by
> > > ESPN. http://msn.espn.go.com/index.html?partnersite=espn
> > >
> > >
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