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SFP-10G-LR minimum distance

tkriegbaum
Beginner
Beginner

Hi,

 

is there any minimum distance required when using cisco's SFP-10G-LR (smf) to prevent any damage on the receiving SFP+ module?

According to what I found in the web there is no minimum distance for IEEE 802.3ae! It can be used even for two meter connections.

 

Can anyone confirm seeing these SFP-10G-LR modules working on short distances?

 

I just want to avoid damaging the modules as they are very expensive but I have to use single mode fiber and the distance is only about 10-20m.

 

thanks,

Thomas

 

1 Accepted Solution

Accepted Solutions

Tom Randstrom
Rising star
Rising star

The transceiver's  max transmit power is 0.5dBm and the maximum receive power is 0.5dBm, so the minimum fiber length can be as short as required. 

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4 Replies 4

Leo Laohoo
VIP Community Legend VIP Community Legend
VIP Community Legend
I would say anything above 1500 feet.

Joseph W. Doherty
Hall of Fame Master Hall of Fame Master
Hall of Fame Master
I recall (?), as you already note, there's a 2m minimum.

Tom Randstrom
Rising star
Rising star

The transceiver's  max transmit power is 0.5dBm and the maximum receive power is 0.5dBm, so the minimum fiber length can be as short as required. 

I haven't re-read the specs, but with Ethernet based technologies, there's often timing dependencies, So I'm wondering, assuming there is a 2M minimum spec, whether it might be based on some timing issue, not just on Tx to RX power.
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