I would assume a degree of conservativism, though fiber attenuation will
differ somewhat, denpending on fiber spec/brand, between 1310nm and 1550nm.
If you're planning a link that "must work", make sure you have fiber
loss measurements at that wavelength, otherwise you'll need to find
a 155Mhz "media converter" or pocket DWDM device that will bump you
up to 1550nm with mid to long-range loss budget numbers.
George
> From cisco-nsp-request@puck.nether.net Sun May 13 05:45:37 2001
> Resent-Date: Sun, 13 May 2001 05:45:29 -0400
> Received-Date: Sun, 13 May 2001 05:42:49 -0400
> X-Sender: hank@max.ibm.net.il
> Date: Sun, 13 May 2001 12:41:17 +0200
> To: cisco-nsp@puck.nether.net
> From: Hank Nussbacher <hank@att.net.il>
> Subject: PoS-OC3 distances
> Resent-From: cisco-nsp@puck.nether.net
> X-Mailing-List: <cisco-nsp@puck.nether.net> archive/latest/6300
> X-Loop: cisco-nsp@puck.nether.net
> Precedence: list
> Resent-Sender: cisco-nsp-request@puck.nether.net
>
> See:
>
> http://www.cisco.com/univercd/cc/td/doc/product/cable/cab_rout/cfig_nts/3916posp/3916over.htm#89992
>
> The above page specifies an optical loss budget of up to 28 dB at 1310 nm.
>
> The normal attenuation for single mode fiber is 0.33 dB/km, which means a
> distance of up to 70 km. However, in the table it is specified at 40
> km. Is this just Cisco being conservative?
>
> Since the wavelength of 1310 nm is "old", does Cisco have an optical
> adapter working at 1550 nm?
>
> Thanks,
> Hank
>
>
This archive was generated by hypermail 2b29 : Sun Aug 04 2002 - 04:12:37 EDT