# Re: [10GBT] Transmit power levels

```As mentioned several times, please don't Confuse the tutorial wlth a proposal.

George A. Zimmerman
cell: 310 920 3860
(sent from my mobile)

-----Original Message-----
Sent: 5/13/04 2:43:07 PM
To: "STDS-802-3-10GBT@LISTSERV.IEEE.ORG"<STDS-802-3-10GBT@LISTSERV.IEEE.ORG>
Subject: Re: [10GBT] Transmit power levels

Sanjay,

According to Solarflare's Nov. 2002 tutorial presentation (pg.17) their
proposed
launch power is 10-12dBm. During his Jan. 2003 presentation

http://www.ieee802.org/3/10GBT/public/jan03/jones_1_0103.pdf

Bill Jones mentions 9.5 dBm launch power (pg.5). After Jan. 2003 meeting
Bill
sent the following e-mail to the reflector and provided detailed analysis
for
coming up with their peak-to-peak launch voltage. That is where I got the
3.134Vpp
launch voltage number for Solarflare.

Plato Labs.
////////////////////////////////////////////////////////////////////////////
/////////////////////////////////////////////////////
Date: Mon, 13 Jan 2003 14:13:18 -0800
From: "William Jones" <wjones@solarflare.com>
To: <stds-802-3-10gbt@ieee.org>
Subject: [10GBASE-T] clarification on voltage level    All headers

In response to some questions at last weeks meeting (and to stimulate
some reflector activity), I wanted to clarify the launch voltage level

For 10 dBm, ideal PAM10 (random data and PSD ~sinc^2) and 100 ohm load

Vrms = sqrt(P*R) = 1 V

Vpeak = Vrms*sqrt(3*(M-1)/(M+1))  where M is the number of PAM levels
= 1.57 V

Vpp = 2*Vpeak = 3.13 V

For 9.5 dBm

Vrms = .944 V

Vpeak = 1.48 V

Vpp = 2.96 V

Note: this is based on an ideal PAM signal, any filtering in the
transmit path will change the PAR and peak voltages.

regards
Bill

William W. Jones, Ph.D.
Director of Systems Engineering
SolarFlare Communications, Inc.
949-581-6830, ext. 2550
mobile: 619-405-2445
fax: 949-581-4695
wjones@solarflare.com

////////////////////////////////////////////////////////////////////////////
/////////////////////////////////////////////////////////////////////
----- Original Message -----
From: "Sanjay Kasturia" <SKasturia@TERANETICS.COM>
To: <STDS-802-3-10GBT@listserv.ieee.org>
Sent: Thursday,