>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,
Message Posted at:
http://www.groupstudy.com/form/read.php?f=7&i=20627&t=19114
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