AW: [802.3ae_Serial] Issue with 1500 Power
Hi
The difference between current defined sensitivity and what would be
required (straightforward without any additional margin penalty....) is 3
dB, what means the attenuation budget would be 10 dB.
Does this clarify?
Regards Juergen
> ----------
> Von: Ron Miller[SMTP:rmiller@brocade.com]
> Gesendet: Mittwoch, 27. Juni 2001 18:10
> An: Rahn, Juergen (Juergen); stds-802-3-hssg-serialpmd@ieee.org
> Betreff: RE: [802.3ae_Serial] Issue with 1500 Power
>
>
> juergen
>
> Please check your numbers below. Thanks
>
> Ron Miller
>
> -----Original Message-----
> From: Rahn, Juergen (Juergen) [mailto:krahn@lucent.com]
> Sent: Wednesday, June 27, 2001 3:30 AM
> To: stds-802-3-hssg-serialpmd@ieee.org
> Subject: AW: [802.3ae_Serial] Issue with 1500 Power
>
>
>
> Hi,
> as discussed in the PMD call I understand there is a mismatch in the
> values
> defined for the 1550 case. The minimum transmitter OMA is -1.39dBm +
> penalties. Link attenuation is set to 13 dB , so this would give a
> sensitivity requirement of -14,39 dBm OMA ,. however the stressed
> sensitivity (In OMA) is defined to be -11.4 dBm.
>
> so there are 10 dB
> difference between those two values.
>
> LOOKS MORE LIKE ABUT 3 DB TO ME.
>
> The trade off that has been introduced
> (that I do not like, but this is a different discussion) will shift this
> complete link power level. When comparing this with powers and
> sensitivities
> as defined in ITU the following appears: ITU defines 2 dB path penalty
> with
> this OMA we would end at a minimum transmitter power average of about -
> 1
> dBm which is in line to ITU. with 109 dB attenuation there is margin in
> the
> ITU numbers, with 11 dB and ITU sensitivity (Which has been confirmed by
> measurements) we add up to 0. ( -14 dBm average power sensitivity and 2 dB
> penalty gives us the G.691 application). When simply taking this
> transmitter
> power and 13 dB attenuation we end up with 2 dB better sensitivity
> requirement as currently experienced by measurements (worst case EOL).
> This may start this conversation.
> Regards Juergen
>
>