[c-nsp] Cisco 7609, LR Transceiver for Short Distance Connection

[Danijel]

On Thu, Sep 9, 2010 at 07:55, Mikael Abrahamsson <swmike at swm.pp.se> wrote:

> On Wed, 8 Sep 2010, Felix Nkansah wrote:
>
>  I am told that using the LR for short distance connections would cause
>> problems, but we don't have time to order new transceivers.
>>
>
> 10GBASE-LR is for 1m - 10km distances. We routinely put 1m patch cords on
> LRs and it's just fine.
>
> 10GBASE-ER/ZR is for 40 and 80km respectivel need attenuators, I'd
> recommend at least 5, preferrably 10dB minimum attenuation.<swmike at swm.pp.se>


He should actually be ok even with ER and no attenuators as minimum transmit
power is -4.7 dBm and max receive power is -1 dBm (per cisco site).
Just check optical power levels and see if they are in limits.