[nsp] WS-G5486 and WS-G5487

[Tay Chee Yong]

Hi Clinton,

Thanks for your prompt reply.

Currently, the circuit is up and running, with one end using a ZX GBIC and the
other end using a LX GBIC. However, during the peak period we will encounter
high latency when large packets were send across the link.

Therefore, I was wondering if its due to this mismatch that causes the high
latency at night.

Do you that the end which is using the LX GBIC needs to use a attentuator to
suppress the frequency generated out from the ZX GBIC?

Please advise.

Regards,
Cheeyong


On Thu, 5 Jun 2003, Clinton Work wrote:

:
: 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
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