I've combed the web with no luck to the answer of my simple
question....
If you use SINGLE-MODE fiber and gbics for very short runs (same room,
across the street), can you damage the GBICS?
If you use appropriately powered GBICs you won't harm your receivers
1000Base-LX is SM, 1310nm
To verify look at your two GBICs, compare the transmit power of one
GBIC to the maximum allowed receive power of the other.
According to
http://www.cisco.com/en/US/prod/collateral/modules/ps5455/ps6577/product_data_sheet09186a008014cb5e_ps872_Products_Data_Sheet.html
The WS-G5486 1000BASE-LX GBIC transmits at -3 to -9.5 dBm and the
receiver can receive between -3 and -19 bBm. That means that even
with 0 loss between a pair of WS-G5486 GBICs the transmit won't
overpower the receiver.
WS-G5487 1000BASE-ZX on the other hand transmit at 5 to 0 dBm and
receive at -3 to -23 dBm. If you are using 1000BASE-ZX optics on a
short run you are 1) wasting money on expensive GBICs and 2) require
the use of attenuators to add dB loss to the link to protect your
receivers.
What has been your experience. Oversaturation? Life-shortening? We
typically use SM towards the telco and MM for internal but have ran
into some legacy fiber where it's SM internal. I have electronic
background so terminology is familiar.
thanks in advance
-les
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