Michael
--
Michael Robson | Tel: +44 (0) 161 275 6113
Senior Network Engineer | Fax: +44 (0) 161 275 6120
Net North West | Email: michael.rob...@manchester.ac.uk
On 30 Apr 2009, at 16:08, Dale W. Carder wrote:
On Apr 30, 2009, at 9:37 AM, Michael Robson wrote:
We have a selection of ZR modules (XENPAK-10GB-ZR)
For these modules, none of them are transmitting at anything like
their maximum of +4.0dBm (Cisco's figures for the maximum transmit
power), they are in fact transmitting between +1.9dBm and +2.3dBm.
This is to be expected. Vendors just publish a tolerable
range somewhere in which the optics will operate.
What determines what they will transmit at i.e. is it simply that
better manufactured ones achieve a transmit value closer to the
+4.0dBm power level
Maybe it's luck.
As I suspected, ah well.
Anyway, how long are your fiber spans? If they are really
long, and you're living on the edge now, you may end up in
a sticky situation as these optics degrade over time.
They are very long distances; however these links are just stop gaps
until we procure our DWDM equipment.
If they are not extremely long, you may have some horrible
jumpers or splices that are eating some dB. Do you have
an OTDR?
Dale
The circuit supplier quoted dB values for the links on handover which
should have meant that most of the links would have been within
acceptable values: perhaps the 6500-quoted values aren't very accurate?
p.s. My fiance did her postgraduate work at Manchester.
Quite a nice place!
Manchester is a great place!
Thanks,
Michael.
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