[nsp] WS-G5486 and WS-G5487

[Clinton Work]

It should work because both the LX and ZX GBICs have wide band receivers (eg 1200 - 1600 nm), 
but you need to carefully check receive levels at installation time. The transit power
of the 1000Base-ZX is strong (+5db) and if used on a short run you
can saturate the 1000Base-LX receiver (-3db to -19db). 

Site A (1000Base-ZX)  <---- dark fiber ----> Site B (1000Base-LX)

Checks:
a) The receive light level at Site B will need to be checked by a 1550nm light meter.
b) The receive light levle at Site A will need to be checked by a 1310nm light meter.

I would recommend at least a 3db operational tolerance from either the maximum or minimum
receive level for the GBIC. You can get troublesome links if the light level is too hot
or too weak. 

You can find the GBIC specs on the following Cisco webpage:
http://www.cisco.com/en/US/products/hw/modules/ps872/products_data_sheet09186a008014cb5e.html

Cisco has some documentation on computing power budgets for SONET links, but the same
calculation applies to optical GBICs as well.
http://www.cisco.com/en/US/tech/tk713/tk607/technologies_tech_note09186a00801492ce.shtml

On Fri, Jun 06, 2003 at 11:07:57AM +0800, Tay Chee Yong wrote:
> Hi all,
> 
> Just like to find out if A-end is using a WS-G5486 (1000Base-LX) and B-end is
> using a WS-G5487 (1000Base-ZX), will there be any performance issues, such as
> latency or packet drops when there is high traffic flow across the link.
> 
> Regards,
> Cheeyong

-- 
=========================================================================
Clinton Work                                        clinton at scripty.com
Calgary, Alberta