Ooops. I did read "maximum" where it says "minimum." Sorry. I guess the
8-dB attenuator inserts loss into the link and he's going to need one on
each end.
The reference says:
The minimum link distance for ZX GBICs is 6.2 miles (10 km) with an 8-dB
attenuator installed at each end of the link. Without attenuators, the
minimum link distance is 24.9 miles (40 km).
I'm assuming by "50 M" he meant meters, not miles? ;-)
Thanks for clarifying this. I figured I was suffering from some kind of
dain bramage when I wrote the message.
Priscilla
At 12:30 AM 9/21/01, [EMAIL PROTECTED] wrote:
>Ummmm, the link is referring to *minimum* distances, not maximum. So 50
>metres is not OK. However, the original poster did say 50m, not 50 metres.
>If 50m was intended to refer to miles, not metres, you might be doing OK :
>-)
>
>Seems rather counter-intuitive - we usually have to worry about whether a
>link is too long. But from my rather limited understanding, I think in
>layman's terms if your link is too short then there will not be as much
>power loss as 'expected', so you are at risk of frying your receiving
>hardware.
>
>JMcL
>----- Forwarded by Jenny Mcleod/NSO/CSDA on 21/09/2001 02:06 pm -----
>
>
>
>"Priscilla
> Oppenheimer" To:
>[EMAIL PROTECTED]
> Subject: Re: how to test the GBIC
>is
> Sent by: 1000BASE-ZX. in GSR
>[7:19114]
>
>nobody@groups
>
>tudy.com
>
>
>
>
>
>21/09/2001
> 12:32
>pm
>
>Please
> respond
>to
>
>"Priscilla
>
>Oppenheimer"
>
>
>
>
>
>
>
>
>Ummmm, he said 50 meters not 50 kilometers. 50 meters should easily be OK.
>
>Priscilla
>
>At 07:58 PM 9/20/01, David C Prall wrote:
> > From the horses mouth:
>
>http://www.cisco.com/univercd/cc/td/doc/product/lan/cat6000/6000hw/mod_inst/
>
> >02prep.htm
> >
> >The minimum link distance for ZX GBICs is 6.2 miles (10 km) with an 8-dB
> >attenuator installed at each end of the link. Without attenuators, the
> >minimum link distance is 24.9 miles (40 km).
> >
> >With a 50m cable you should not be getting any kind of link and are most
> >likely overdriving the Receive end.
> >Therefore, when you do find a 40km long
> >cable it may not work either.
> >
> >David C Prall [EMAIL PROTECTED] http://dcp.dcptech.com
> >----- Original Message -----
> >From: "Wang"
> >To:
> >Sent: Saturday, September 08, 2001 11:49 AM
> >Subject: how to test the GBIC is 1000BASE-ZX. in GSR [7:19114]
> >
> >
> > > Dear all :
> > >
> > > I 've are problem about testing cisco GBIC ZX in GSR. I just 've 50 M
> > > single mode fiber.
> > > Would you mind give me some information for test the GBIC.
> > >
> > > Story :
> > > Our client 've order 3 GBIC for Three-port Gigabit Ethernet Card .
> > > But, some problem in 2 GBIC can't pass connection test.
> > >
> > >
> > > Test 1 )
> > > I use the SC fiber cross at both GI port at e.g ( Gi2/0 to Gi 3/0).
> > > The both 3GE-GBIC-SC status can not active & the all LED is off.
> > > I 've try to sweep the TX & RX position and sweep to next Gigabit
> > > Ethernet module..etc.
> > > Still no response .
> > >
> > > Test 2 )
> > > Next test, it test is use the one fiber cable only (single side). Make
> > > the GBIC TX & RX in loop at single fiber. Just one GBIC can enable &
> > > up. Other GBIC still is no response !
> > > Remark : In this section the fiber have tested at both tx & rx is up.
> > >
> > > Our GBIC is 1000BASE-ZX.
> > >
> > > Following massage back from TAC:
> > > ZX can reach about 70km, it is the most powerful one GBIC. Be sure to
> > > use attenuator,
> > > otherwise GBIC may be damaged by overpower level laser!!!
> > >
> > > In order to explain different performance from your 3 GBIC, I think we
> > > can look at the tx
> > > level of max 6db to min 0db. If the one tx 0db, certainly rx will
>below
> > > 0db. If the other tx
> > > 6db, 50m fiber is not enough to cause 6db loss, so interface is still
> > > down and GBIC may be
> > > damaged.
> > >
> > > 9/125um SM 1000Base-ZX SC
> > > 6 tx max
> > > 0 tx min
> > > 0 rx max
> > > -23 rx min
> > > 70 km 42 mile
> > > 1000Base-ZX can reach up to 100km (60mi) by using dispersion shifted SM
> > > or low
> > > attenuation SM
> > >
> > > Regards,
> > > Eric,
>________________________
>
>Priscilla Oppenheimer
>http://www.priscilla.com
________________________
Priscilla Oppenheimer
http://www.priscilla.com
Message Posted at:
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