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015 - Energy Efficient Ethernet Being Studied by IEEE [29-Mar-2007]
 
US energy consumption from electronic equipment is consuming 200 TWh of energy per year, costs an estimated $16 billion/year and generates nearly 150 million tonnes of CO2 per year. Network equipment alone consumes an estimated 13 TWh/year. Gartner recently stated that power hungry hardware and global fuel prices could lead to energy costs eating up more than one-third of IT budgets in the next 5 years. With energy conservation being high on the political agenda, IEEE 802.3 has established a study group to investigate what it can do to reduce the overall energy demand from Ethernet equipment.
 
download 015 - 2007 White Paper pdf.pdf 85 KB
 
 
007 - Structured Cabling for Industrial Premises [16-Feb-2007]
 
This is a brief review of the emerging market for industrial networks plus a summary of standards projects for industrial premises cabling.
 
download 007 - 2007 White Paper.pdf 88.91 KB
 
 
006 - 10 Gigabit Ethernet over Legacy Multimode Fibre [16-Feb-2007]
 
The distance capability of existing 10 Gigabit Ethernet products is severely limited by modal bandwidth. 10GBASE-SR supports only 33m with OM1 and 82m with OM2. A 4-channel CWDM version, 10GBASE-LX4, increases the operating range to 300m using existing multimode fibre types however this solution is complex and products are not widely available. 10GBASE-SR operating distance may be increased to 300m by using OM3 multimode fibre, but OM3 is more expensive than OM1/OM2 and its installed base is no yet significant. This white paper describes a more advanced version of 10 Gigabit Ethernet that operates over increased lengths of legacy multimode fibre. 
 
download 006 - 2007 White Paper.pdf 110.72 KB
 
 
005 - 10 Gigabit Ethernet over Copper Cabling [16-Feb-2007]
 
Gigabit Ethernet posed many challenges in its bid to operate over installed twisted pair cabling but the final solution was accomplished with a 1 million transistor silicon chip. The networking industry has since repeated this accomplishment with a 10 Gigabit system. This white paper describes its design and provides an assessment of the market need for 10 Gigabit over copper.
 
download 005 - 2007 White Paper.pdf 172.09 KB
 
 
004 - The Impact of Bit Error Rate on LAN Throughput [16-Feb-2007]
 

Claims that a low level of re-transmissions could have a devastating affect on LAN throughput prompted us to examine the mechanisms that might cause this.   The following analysis challenges the claim that just 1% packet re-transmission can reduce throughput by as much as 80% but illustrates that such claims are not without foundation. 


We will attempt to answer a number of related questions using basic technical assumptions but also by adopting a worst case scientific approach.

 
download 004 - 2007 White Paper.pdf 113.34 KB
 
 
003 - Supporting LANs over 2nd Generation Cabling [16-Feb-2007]
 
Bandwidth capacity of network technologies has increased by a factor of 10 every 5 years. In fact, Moore’s Law is clearly illustrated by the evolution of LANs, which have increased in speed from 1 Mbit/s to 10 Gbit/s over the last 20 years. This white paper reviews the transmission requirements of network applications operating at data rates of 100 Mbit/s and above. It evaluates their operation over structured cabling as defined by 2nd edition industry standards.
 
download 003 - 2007 White Paper.pdf 160.82 KB
 
 
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