Re: 120 km and 1000Base-ZX

Hi Maher,

You might want to check this page:

http://www.cisco.com/en/US/prod/collateral/modules/ps5455/white_paper_c11-463661.html

It *might* be possible to do using the correct CWDM optics (they
should cost the same as standard ZX), but it might be best to ask the
company that created the fiber connection for a measurement report. If
you have this, combined with the optics specs you could do the
measurement (shameless copy from above link):

Link Budget for WDM and Amplified Transmissions over Single-Mode Fibers
In the case of WDM transmissions, passive modules are used to
multiplex and demultiplex various wavelengths respectively before and
after the signal propagates along the fiber channel. These passive
modules introduce additional insertion losses suffered by the signal
transmitted.
Additionally, the signal may be amplified and compensated for
dispersion, and in this case, the amplifier gain and the dispersion
compensation unit's loss need to be taken into account. Dispersion and
OSNR penalties suffered by the receiver shall be considered as well.
Therefore all the parameters needed for a proper link budget evaluation are:

 The minimum transmit power guaranteed (minTx), expressed in dBm

 The minimum receive power required (minRx), expressed in dBm

 The loss of optical connectors and adapters (L), expressed in dB

 The number of connectors and adapters (n)

 The normalized fiber loss (FL), expressed in dB/km

 The reach or distance to be achieved (d), expressed in km

 The loss of passive add/drop modules (A and D), expressed in dB

 The gain of the amplifier (G), expressed in dB

 The penalty suffered by the receiver (P), expressed in dB

 The loss of a dispersion compensation unit (DCU), expressed in dB
With these parameters, (LB) is given as for previous cases:

 (LB) = (minTx) - (minRx)
And the total loss is expressed as follows:

 (TL) = n*(L) + d*(FL) + (A) + (D) - (G) + (DCU) + (P)
Here again, if (LB) is greater than (TL), then the physical deployment
is feasible.

I haven't made such calculation before, but I might guess someone else
on the list has!

Kind regards,

On 3 June 2010 15:03, ccielight cisco <ccielight_at_gmail.com> wrote:
> Hello guys,
>
> I would like to bring up my connection between two site A to B and distance
> is 120 km. The 1000Base ZX is only 70 km and can reach the maximum of 100 km
> so it is not applicable here.
>
> Any idea how to proceed ?
>
> Thanks in advance,
>
> Maher
> CCIE R&S
>
>
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Received on Thu Jun 03 2010 - 15:38:03 ART