You should not need any attenuation if you are using the same lr sfp/xfp on
both ends. However there is a small chance if they are different part numbers
or manufacturers that one may transmit at the same or greater than the others
max receive level. Typically it is a .5-1db tx with a max rx of 3-4. I have ran
into some 4db tx XFPs though. It will probably work fine like that, but I have
had a couple trickle errors under high utilization.
I would say it's always best to keep some attenuators on hand probably 5db and
10db with those you can make just about any optic work at any distance less
than what they are rated. I personally carry around everything from 1-20db
because of manualy balancing dwdm systems and seem to go through 4,7 and 13s
the most.
-------- Original message --------From: Chuck McCown <ch...@wbmfg.com> Date:
9/14/16 5:19 PM (GMT-06:00) To: af@afmug.com Subject: Re: [AFMUG] Single mode
attenuators needed at 30m
The SFP spec will have an absolute maximum RX level. If I
remember correctly, last one I checked was higher than the max TX level of 4
dBm. Seems like the absolute max RX was something like 16 or 20 dBm.
From: Eric Kuhnke
Sent: Wednesday, September 14, 2016 2:41 PM
To: af@afmug.com
Subject: Re: [AFMUG] Single mode attenuators needed at
30m
Those are totally safe to use with even a 1 meter fiber patch cable
between two pieces of gear in the same rack.
On Wed, Sep 14, 2016 at 1:39 PM, TJ Trout <t...@voltbb.com> wrote:
1310 10gb 10km
On Wed, Sep 14, 2016 at 1:38 PM, Eric Kuhnke
<eric.kuh...@gmail.com> wrote:
What frequency and tx power of singlemode? You do not
need to attenuate 1GbE 1310nm LX (5-10km reach) or 10GbE 1310nm LX optics
for very short distances. Tons of ISPs use all 1310/LX optics for
intra-rack
and intra-suite fiber XCs because they're cheap, easy and multimode is
dumb.
If you are using optics which are marketed as capable of 20, 40 or
more km reach (and/or 1490nm, 1550nm optics) you do need to attenuate on
the
Rx.
On Wed, Sep 14, 2016 at 11:20 AM, TJ Trout
<t...@voltbb.com> wrote:
Do I need to pad my optics at 100ft? Or could someone tell me
how to estimate the loss so I can compare to the
spec?
