Steve Swanson
                            Corning

         Fiber Specifications for 802.3 Gigabit Ethernet

               IEEE 802.3 Higher Speed Study Group
                         May 22, 1996
                        Wakefield, MA
         

Optical Specifications - 62.5 mm 

Attribute					Specification		
			
Maximum Attenuation			 	4.0 dB/km @ 850 nm		
			
Minimum Modal Bandwidth				160 MHZ km @ 850 nm		
			
Zero Dispersion Wavelngth			1332  l0 1354		
			
Zero Dispersion Slope				S0  0.097 ps/(nm2 km)		


Optical Specifications - 50 mm

Attribute					Specification		
			
Maximum Attenuation				3.5 dB/km @ 850 		
			
Minimum Modal BW				400 MHZ km @ 850		
			
Zero Dispersion l				1297  l0 1316		
			
Zero Dispersion Slope 				S0 0.101 ps/(nm2 km)		

Maximum Link Lengths

- 400 MHz*km minimum modal bandwidth will support >500 meters at 1.25 Gbaud 
  with a 850 nm VCSEL with .45 ns risetime
- 400 MHz*km minimum modal bandwidth will support 256 meters at 2.50 Gbaud 
  with a 850 nm VCSEL with .25 ns risetime
- 500 MHz*km minimum modal bandwidth will support >600 meters at 1.25 Gbaud 
  with a 850 nm VCSEL with .45 ns risetime
- 500 MHz*km minimum modal bandwidth will support >300 meters at 2.50 Gbaud 
  with a 850 nm VCSEL with .25 ns risetime

Summary

- 400 MHz*km minimum modal bandwidth is needed to support 1.25 Gbaud Ethernet
- 500 MHz*km minimum modal bandwidth will support >300 meters at 2.50 Gbaud 
  with a 850 nm VCSEL with .25 ns risetime
- 300 meters represents 95-98% of NA buildings
- 50 mm multimode fiber is a standard product that will meet the requirements
- Corning will work with the HSSG to further develop fiber specifications