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RonCates
Sanjib – Yes, radiated emissions also need to be contemplated. But the good ...
DF
I thought there was also an option for shielded cable for 10GBase-T.
10Gb/s Ethernet and 10GBase-T for the data center
Shaun Walsh
7/25/2011 12:26 AM EDT
Network convergence on 10GBase-T
One of the benefits of moving to 10GbE is the option to converge network and storage traffic on a common set of adapters, cables and switches, thereby reducing operational expenditures (OpEx) and capital expenditures (CapEx). A converged network streamlines and eliminates repeated administrative tasks such as server and network provisioning with a "wire once" deployment model. The converged network also improves business agility letting data centers dynamically and rapidly respond to requests for new or expanded services, new servers and new configurations. Furthermore, with a unified network, data centers can reduce their capital requirements by:
• 30 percent for adapters and switches
• 80 percent for cabling
• 40 percent for power and cooling
Support for 10GBase-T will also enable more 10GbE deployment for network attached storage (NAS) and iSCSI storage, as both rely on an Ethernet network and are constrained with 1GbE. Next-generation iSCSI and NAS storage solutions are based on 10GbE to support a full range of data center applications, including database and video content. Today's universal converged network adapters are now fully supporting iSCSI and NAS storage with high performance offloads for networking and storage protocols.
10GbE for the cloud
Cloud computing is emerging as the next cost-saving technology for data centers. In order to satisfy performance demands with a highly-efficient infrastructure, cloud providers are also moving to 10GbE networks. 10GBase-T will make this possible using low-cost twisted pair cables. Most of the cloud data centers are "green-field" deployments that can wire once using Cat 6a cabling for maximum flexibility.
Moving forward
As you plan your data center migration from 1GbE to 10GbE, be sure to purchase equipment that is backward-compatible and provides support for converged networking. Industry experts and leading- edge network vendors provide extensive tools and advice to that can help you optimize your transition to 10GbE. With 10GBase-T, the migration to 10GbE will be cost-effective and meet performance and budget requirements.
Shaun Walsh is vice president of marketing at Emulex Corp.
One of the benefits of moving to 10GbE is the option to converge network and storage traffic on a common set of adapters, cables and switches, thereby reducing operational expenditures (OpEx) and capital expenditures (CapEx). A converged network streamlines and eliminates repeated administrative tasks such as server and network provisioning with a "wire once" deployment model. The converged network also improves business agility letting data centers dynamically and rapidly respond to requests for new or expanded services, new servers and new configurations. Furthermore, with a unified network, data centers can reduce their capital requirements by:
• 30 percent for adapters and switches
• 80 percent for cabling
• 40 percent for power and cooling
Support for 10GBase-T will also enable more 10GbE deployment for network attached storage (NAS) and iSCSI storage, as both rely on an Ethernet network and are constrained with 1GbE. Next-generation iSCSI and NAS storage solutions are based on 10GbE to support a full range of data center applications, including database and video content. Today's universal converged network adapters are now fully supporting iSCSI and NAS storage with high performance offloads for networking and storage protocols.
10GbE for the cloud
Cloud computing is emerging as the next cost-saving technology for data centers. In order to satisfy performance demands with a highly-efficient infrastructure, cloud providers are also moving to 10GbE networks. 10GBase-T will make this possible using low-cost twisted pair cables. Most of the cloud data centers are "green-field" deployments that can wire once using Cat 6a cabling for maximum flexibility.
Moving forward
As you plan your data center migration from 1GbE to 10GbE, be sure to purchase equipment that is backward-compatible and provides support for converged networking. Industry experts and leading- edge network vendors provide extensive tools and advice to that can help you optimize your transition to 10GbE. With 10GBase-T, the migration to 10GbE will be cost-effective and meet performance and budget requirements.
Shaun Walsh is vice president of marketing at Emulex Corp.
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Sanjib.Acharya
7/25/2011 12:18 PM EDT
As I know, the "alien crosstalk" was one of the biggest challenges for using the Cat6 cable for Gbit Ethernet. What is the change that is made in the insulation to reduce the alien crosstalk?
In the second para in this article, it is mentioned about using "unshielded cable" for 10GbaseT. Again, I still see a major risk in using an unshielded cable for 10Gbit/sec due to EMC concerns.
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RonCates
7/25/2011 9:26 PM EDT
Sanjib – The Cat6A cables I have seen reduce alien crosstalk due to plastic ribs in their core which specially separate the twisted pairs. Since electromagnetic radiation intensity falls off as the square of the emission radius, it’s a very effective technique.
As for Electromagnetic interference, I would agree with you if it wasn’t for the recent advances in the DSP algorithms inside of the 10GBase-T transceivers which have been shown to provide immunity to very strong EMI events of up to 10V/m. Those DSP engines are able to place a notch filter at the interferer’s emission frequency and prevent it from causing havoc with the received data.
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Sanjib.Acharya
7/25/2011 10:37 PM EDT
Hi Ron, I got your points on crosstalk & EMC. Yes, that's how it could be done. Thanks a lot!
Regarding the EMC (or rather EMI?) I was more concerned with the "unshielded cable" emitting RF energy creating trouble for others. Any thoughts?
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RonCates
7/27/2011 7:37 PM EDT
Sanjib – Yes, radiated emissions also need to be contemplated. But the good news is that the IEEE Standards body anticipated the potential for radiated emissions and has taken corrective measures. First, recognize that, like in 1000Base-T, 10GBase-T signaling is differential in nature and transmitted on twisted pairs that cancel emissions to first order. Nevertheless, there is residual radiation and even some common mode components due to non-idealities. To cope with those, IEEE was careful to architect the output energy of a 10GBase-T transmitter to be more evenly distributed over the transmission band and, furthermore, in Clause 55.9.5, requires compliant equipment to meet FCC Part 15 or CISPR 22 (depending on geography) limitations for radiated emissions. Bottom line: it’s purpose built to live and work in a data center environment without causing problems.
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chanj
7/26/2011 11:18 AM EDT
What is the current running through the cable that EMI becomes a concern?
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Sanjib.Acharya
7/26/2011 1:20 PM EDT
Good point! I am not much concerned with only one cable. But I think, usually there would be many...isn't it? I thought it would be challenging to meet EMC norms as they would emit more when the cables are unshielded?
But again I saw many have passed the EMC tests. One such example could be found below:
http://docs.commscope.com/Public/Cat6AUTP_Passes_EMC_Tests.pdf
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DF
7/27/2011 12:58 PM EDT
I thought there was also an option for shielded cable for 10GBase-T.
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