Comments on Power Backoff Bijit Halder 19 November

Comments on Power Back-off Bijit Halder 19 November 2004 Email: bijit@platonetworks. com IEEE 802. 3 an: 10 BASE-T Task Force June 5, 2002 tel. ICos Corporation Proprietary

Simulation Parameters Ø Ø Ø Ø Channel model: Class E cable Transmit PSD: -81 d. Bm/Hz (Power: 5 dbm) Background noise: -150 d. Bm/Hz Optimal SNR is calculated using Salz equation Frequency: 1 to 400 MHz, Resolution: 1 MHz No residue Echo, NEXT, or FEXT; No AFEXT All models are based on D 1. 1 ANEXT for simulation is 2. 5 d. B lower than the limit line, as recommended in D 1. 1 Plato Networks • 2/25/2021 IEEE 802. 3 an: 10 GBASE-T Task Force Bijit Halder 2

Channel Response: Limit Line Plato Networks • 2/25/2021 IEEE 802. 3 an: 10 GBASE-T Task Force Bijit Halder 3

PSANEXT (with 2. 5 d. B Reduction) Plato Networks • 2/25/2021 IEEE 802. 3 an: 10 GBASE-T Task Force Bijit Halder 4

Optimal SNR vs. Length Plato Networks • 2/25/2021 IEEE 802. 3 an: 10 GBASE-T Task Force Bijit Halder 5

Comments Ø Ø Ø We have agreed to power back off level more than 10 d. B For Class E cable, if the achievable SNR is lower for short length of cable, how is power back off feasible? With the addition of AFEXT and residual Echo, NEXT, and FEXT, the achievable SNR will only be less making power back off even harder. Plato Networks • 2/25/2021 IEEE 802. 3 an: 10 GBASE-T Task Force Bijit Halder 6