Dear Quyen:
                We use a couple of ZX GBIC between our two machine room
                on the Cisco 3508, the distance is about 15-18 km,
                and it works fine.
                By the specification of ZX GBIC, the input power range
                of ZX GBIC is -3dBm to -23 dBm,
                so I think you will use the ZX GBIC well on your sites.

Best Regards

--
=====================================================
Kae Hsu      [EMAIL PROTECTED]     Sun CNA
Digital United Inc.        Communication Network Dep.
9F, No. 220, Gangchi Road, Taipei 114, Taiwan, R.O.C.
TEL: (02)27983411          FAX: (02)26585758
=====================================================

""Nguyen Quyen""   Have anyone installed the Cisco GBIC ZX (WS-G5487)?
> We have the 12km singlemode fiber optic link between 2 site and we use 02
> Cisco 2950G-24 with 02 GBIC ZX. The end-to-end link attenuation was 7dB.
> The question is: we must use the additional attenuator? If yes, what kind
of
> it we must choose?.
>
> Pls help me! Thank a lot!
>
> Quyen




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