[ietf79-tech] Meeting invitation: IETF 79 Tech Call

[Bill Jensen]

Unlike XFPs, SFPs terminology tends to vary quite a bit as you move away 
from plain old LX optics.  It looks like Juniper has 1310nm 1000BASE-EX 
optics that are rated at 40km which is believable since the Tx is at 
least -4 and the receive sensitivity is -22.

http://www.juniper.net/techpubs/en_US/release-independent/junos/topics/reference/specifications/transceiver-m-mx-t-series-1000base-optical-specifications.html#jd0e497

Normally for distances greater than 16km I would grab a pair of 1550nm 
SFPs (good for 40km or 80km) and call it a day.  But these 1310nm 
pluggables have >18dB of power budget and should do 40km no problem as 
the launch power is around 10dB more than an LX and much better receiver 
sensitivity.

In any case, just note the span loss for the fiber span in question, 
figure about .4dB/km loss @1310nm and .25dB/km loss @1550nm.  Then find 
optics that have a power budget that fits the bill.

On 10/11/10 9:28 PM, Jim Martin wrote:
> 	I'm pretty sure standard LX won't make it 20 Miles ... we might need to hunt down some ZX optics...
>
> 	- Jim
>
> On Oct 11, 2010, at 6:42 PM, Xiaoliang Zhao wrote:
>
>>> mx80s will do that
>>>
>> we can use it too. It's all JUNOS anyway.
>>
>>> but "will do ~20 miles" is not well specified.  do you mean SM LX or SX?
>>>
>> SM LX, I think.
>>
>> Thanks,
>> Leon
>>
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