nanog mailing list archives
Re: MultiMode Fiber Connectivity... (850nm) Power Question
From: Faisal Imtiaz <faisal () snappytelecom net>
Date: Wed, 11 Feb 2015 21:46:24 +0000 (GMT)
Thanks Justin... Faisal Imtiaz Snappy Internet & Telecom 7266 SW 48 Street Miami, FL 33155 Tel: 305 663 5518 x 232 Help-desk: (305)663-5518 Option 2 or Email: Support () Snappytelecom net ----- Original Message -----
From: "Justin M. Streiner" <streiner () cluebyfour org> To: "NANOG" <nanog () nanog org> Sent: Wednesday, February 11, 2015 12:41:23 PM Subject: Re: MultiMode Fiber Connectivity... (850nm) Power Question On Wed, 11 Feb 2015, Faisal Imtiaz wrote:I was looking for feedback on the following question:- When connecting two MM SFP/SFP+/XFP 's together...(short range). What should be the best practice receive power range ?SX (1G) / SR (10G) / SR10 (100G) gear generally has a receive threshold that's higher than the maximum launch power. They are designed for short-reach applications (in-building, data center, etc), so no attenuation is needed.Is it true that if the rx power is higher than (x?) then it shortens the life of the optics ? (assumption being made here is that MAX Rx Power is not being exceed as per the spec sheets of the optics)On short-reach optics, this should never be a problem. On long-reach optics, receiver saturation will generally result in link errors/flaps, and possibly high rx power warnings (depending on the gear on the receiving end), however, these can be addressed using in-line attenuators. On very long-reach optics, such as ZX (1G) and ER/ZR (10G), it is possible to damage the receivers with too hot of a signal because they are designed for long spans and a certain amount of distance-based attenuation is factored into the optical power budget. jms
Current thread:
- MultiMode Fiber Connectivity... (850nm) Power Question Faisal Imtiaz (Feb 11)
- Re: MultiMode Fiber Connectivity... (850nm) Power Question Bob Evans (Feb 11)
- Re: MultiMode Fiber Connectivity... (850nm) Power Question Faisal Imtiaz (Feb 11)
- Re: MultiMode Fiber Connectivity... (850nm) Power Question Eric Litvin (Feb 11)
- Re: MultiMode Fiber Connectivity... (850nm) Power Question Justin M. Streiner (Feb 11)
- Re: MultiMode Fiber Connectivity... (850nm) Power Question Faisal Imtiaz (Feb 11)
- RE: MultiMode Fiber Connectivity... (850nm) Power Question Jameson, Daniel (Feb 11)
- Re: MultiMode Fiber Connectivity... (850nm) Power Question Bob Evans (Feb 11)