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Is my fiber run too short for an LRM??

PacNWNetTek
Beginner
Beginner

Good Morning Cisco Community,

 

Hopefully this is a quick and easy question. I am upgrading a 1G SFP SR to a 10SFP LRM on an OM1 line is it possible to experience issues if the run is say just 50ft? I am doing a lot of research on SFP's and I am finding that it doesnt matter which type(SR/LRM) it is on the OM1 line, if its 10G the max range is 33m and exceeding that will give you issues. However, I am curious if using a LRM on a rather "short" run will also do similar. This will tell me that i should use a 10G SR instead.

 

Thanks

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balaji.bandi
VIP Guru VIP Guru
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Look at the datasheet : 1 Minimum cabling distance for -SR, -LRM, -LR, -ER modules is 2m, according to the IEEE 802.3ae. 

 

https://www.cisco.com/c/en/us/products/collateral/interfaces-modules/transceiver-modules/data_sheet_c78-455693.html

 

 

BB

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3 Replies 3

balaji.bandi
VIP Guru VIP Guru
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Look at the datasheet : 1 Minimum cabling distance for -SR, -LRM, -LR, -ER modules is 2m, according to the IEEE 802.3ae. 

 

https://www.cisco.com/c/en/us/products/collateral/interfaces-modules/transceiver-modules/data_sheet_c78-455693.html

 

 

BB

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PacNWNetTek
Beginner
Beginner

@balaji.bandi definitely clears it up. Thanks

Joseph W. Doherty
Hall of Fame Master Hall of Fame Master
Hall of Fame Master

Believe specs only require minimum of 2 meters, as also noted by @balaji.bandi .

However if you do run into to this, like when using ZX kind of optics, sometimes there might be a "coil" of fiber at one or both ends to provide the longer needed fiber run, or you might use attenuators, which come with different dB specs, to diminish signal strength.

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