I have seen several vendors on the internet that manufacture a 1550/1310 transceiver for 1000 Base BX U/D operation over a single mode fiber strand. According to the documentation that i have found on Cisco's site, it appears that the max distance is 10km.
Is it possible to stretch Cisco operation of 1000 Base BX 1310/1490 to over 10km? What are my options for 10km + - is 1000BaseZX the only option I have for 3750 series at 10km+
Over time the laser will degenerate. Cisco certifies their optics to work up to 10km.
I have definately used it in places over 10km, but we have spares in place. I havent gone much further than 10km, and have since moved to another vendor who can do up to 120km over the BX-U/D type SFP.
My average launch power on the BXU is
-6.2dbm and the receiver sensitivity is
-19dbm. This gives you a 12.8 optical budget to work with.
Example, 40,000 feet = 12.191km. At .35 db/km loss that gives you 4.27db used. Add your patch panels (.5db loss), add a reserve in of 3db for bad splices (or whatever), and you should have a sensitivity left over of 4.5dbm, with 8.3dbm used.
Just an example, at 70,000 feet or 21km, I have a estimated reserve sensitivity of 1.3db based off the average launch powers I see when I used those in the past.
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