Thanks. On Thu, Jun 18, 2009 at 10:49 AM, Buhrmaster, Gary <[email protected]>wrote:
> > What are the implications of using a GLC-ZX-SM module to light a > > stretch of 20 - 30km? Would I need to add an attenuator, given that 20km > is well > > below the 70km limit? > > > As always, the answer is "it depends", because > it is the optical power, not distance, but usually > if the link is <~25km you can expect to need an > attenuator. The typical transmit is ~ 0-5dBm, > and the max receive power is ~ -3dBm. If you > overload the receiver, you could damage the > device, or shorten is life, or cause various > physical link errors to be reported as the > optics is overloaded. So, in all cases, > measure the received power, and add in the > needed attenuation. > > Reference: > > http://www.cisco.com/en/US/prod/collateral/modules/ps5455/ps6577/product_data_sheet0900aecd8033f885.html > > Gary > _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
