[...]

="Coding Scheme for Gigabit Ethernet
=  PAM-5 (Pulse Amplitude Modulation 5 Levels) 
=  2 Bits per symbol ( => 4 bit combinations or levels) 
=  Symbol Rate 125 Mbaud/sec 
=  Bit Rate per pair 250 Mbits/sec 
=  Bit Rate using 4 pairs 1000 Mbits/sec 
=  5th coding level used for control and management 
=  Simultaneous Bi-Directional Transmission " 
=

I haven't read the spec, but I am confused in what I have read about
the data rate. Is it 250 Mbits/sec per pair in each direction
simultaneously? Some things I have read imply 1000base-T is 500Mbits/
sec transmit + 500Mbits/sec receive instead of 1000Mbits/sec and
1000Mbits/sec receive simultaneously.

-- 
=============================================================================
Mike Mayer                               Artesyn Communication Products, Inc
                                         Madison, WI
                                         http://www.artesyn.com/cp
=============================================================================


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