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Most recent posts by "Paul Kish"

Migration Strategies to 40G & 100G Over Multimode Fiber Webinar
Blog Category: Belden News

Posted by: Paul Kish on May 23, 2012

Paul Kish, Director of Systems & Standards at Belden, be hosting a webinar covering Migration Strategies to 40G & 100G Over Multimode Fiber on May 24, 2012 from 2:00-3:00pm EDT.

This presentation will provide an overview of the cabling requirements for networks operating on 40GBASE-SR4 and 100GBASE-SR10. Attendees will receive guidance on an effective migration strategy to 40 and 100 Gigabit Ethernet over multimode fiber; optical fiber loss testing for accurate measurements; and the need for low-loss connectors to meet tight insertion loss budgets for 40G and 100G Ethernet links.


Data Center Game-Changer: How Will You Be Impacted by Data Center Fabrics?
Blog Category: Data Centers

Posted by: Paul Kish on June 12, 2013

Data center network design has been undergoing rapid changes with the adoption of technologies such as server virtualization. As a result, data center traffic is changing from predominantly north-south (i.e., into and out of the data center) to east-west (i.e., server-to-server within the data center).

A traditional three-tier switching architecture using core, aggregation and access switches is not ideal for large, virtualized data centers. For one server to communicate with another, the data may need to traverse north from an access switch along a hierarchical path through aggregation switches and a core switch and then south again through more switches before reaching the other server.

In other words, the data has to go through more “hops” as it moves from switch to switch. This adds latency, which can ultimately create traffic bottlenecks—something every data center manager strives to avoid.

Data center switch fabrics that typically use only one or two tiers of switches are now widely viewed as the optimal architectures to enable east-west traffic. These flattened architectures provide low-latency and high-bandwidth communications between any two points to meet the needs of virtualized networks and ever-increasing application and traffic load.


Tags: Data Center, Data Center Fabrics, Data Center Maze, Webinar, Fat Tree

Maintaining Polarity—A Not-So-Simple Necessity
Blog Category: Data Centers

Posted by: Paul Kish on June 26, 2013

In today's Data Centers, 12-fiber preterminated array cabling is frequently used to establish an optical path between switch tiers. Accomplishing this path in a way that matches the transmit signal (Tx) on one switch port to the corresponding receive signal (Rx) on the other switch port is referred to as polarity.

In August 2012, TIA published Addendum 2 to the ANSI/TIA 568-C.0 Generic Telecommunications Cabling for Customer Premises Standard that provides three example methods to establish polarity of optical fiber array systems—Connectivity Method A, B and C. While the standard makes no preference for one method over another, it does recommend that a method be selected in advance and maintained throughout an installation; otherwise it won't work. The TIA standard addresses both multiple duplex signals (for 10 Gigabit Ethernet or 8, 10 and 16 Gigabit Fibre Channel) and parallel signals (for 40 Gigabit Ethernet). The current migration to 40 Gigabit Ethernet warrants taking a closer look at polarity methods for both applications.


Migrating to the Fat Tree
Blog Category: Data Centers

Posted by: Paul Kish on July 10, 2013

In my latest webinar, Data Center Game Changer: Understanding the Impact of Data Center Fabrics, we discussed the latest trend of implementing switch fabrics to provide low-latency and high-bandwidth east-west communication for large virtualized data centers.

During the webinar, I highlighted a recent survey by Enterprise Strategy Group where 16% of respondents indicated that they have already begun implementing flat data center fabric with another 38% planning to do so.

As confirmed by several of the questions I received following the webinar, another 36% of the survey respondents said they wanted to learn more about switch fabrics before making the decision to implement.

One of the most frequently asked questions surrounds migrating from traditional three-tier architecture to fat-tree architecture in existing data centers.

Following are a few key considerations to help you on your migration path


Tags: Data Center, Data Center Fabrics, Fat Tree, Switch Architecture

Don’t Forget About Physical Security
Blog Category: Data Centers

Posted by: Paul Kish on August 28, 2013

In the first three months of 2013 alone, the Identity Theft Resource Center recorded nearly 875,000 exposed personal records. From medical records to credit card information, data centers in a variety of industries must remain extremely cautious and maintain updated firewalls, encryption and authentication methods to protect sensitive information.

Whether it’s an enterprise class data center or a large colocation facility, physical protection must also be considered. ANSI/TIA-942 and a variety of other standards related to specific industries (e.g., Sarbanes-Oxley, HIPAA) provide guidelines and requirements for physical protection of the data center.


Tags: Data Center

PUE Standards for Energy Efficient Data Centers on the Horizon
Blog Category: Data Centers

Posted by: Paul Kish on October 10, 2013

There is much discussion in the industry on how to measure and improve the energy efficiency of data centers. Thankfully, a number of organizations and standards committees are actively developing uniform and accurate methods, including the ISO/IEC JTC 1/SC 39 Subcommittee on Sustainability for and by Information Technology, which was formed in November 2011.

ISO/IEC CD 30134-2

One of the key draft standards within the ISO/IEC JTC 1/SC 39 Subcommittee is ISO/IEC CD 30134-2: Information Technology, Data Centres, Key Performance Indicators—Part 2: Power Usage Effectiveness (PUE).


Tags: Data Center, PUE

Free-Cooling: A Real Opportunity for Data Center Efficiency
Blog Category: Data Centers

Posted by: Paul Kish on October 17, 2013

A major factor that can influence power usage effectiveness (PUE) in a data center is the type of cooling system deployed and whether or not it includes free cooling.

Free cooling is the ability to leverage existing local ambient conditions to reduce energy usage. There are several latitudes and elevations around the world where data center managers can reduce the use of CRAC units and associated cooling costs by taking advantage of outside environmental conditions. According to reports by HIS, the market for free cooling technologies will grow faster than any other cooling methods over the next four years.


Tags: Data Center, Cooling

Happy Birthday Ethernet: You've Come A Long Way
Blog Category: Data Centers

Posted by: Paul Kish on December 05, 2013

While not officially considered “over the hill,” Ethernet recently celebrated its big “4-0.” Since its birth in 1973 and the publication of the 10BASE-T Ethernet standard in 1990, a lot has changed. Every five to seven years, Ethernet has grown up by a factor of 10—in speed that is.

Just take a look at twisted-pair cabling alone. We went from 10BASE-T with a data rate of 10 Mb/s over category 3 cabling in 1990, to 100BASE-TX at 100 Mb/s over category 5 in 1995, to 1000BASE-T at 1 Gb/s over category 5e or higher in 1999, to 10GBASE-T at 10 Gb/s over category 6A in 2006. And now we’re less than two years away from 40GBASE-T at 40 Gb/s over future category 8 cabling. Fiber is another story—moving from 1 Gb/s over multimode and singlemode fiber in 1998 to 10 Gb/s in 2003 to 100 Gb/s in 2010. That’s speed increased by a factor of 100 in just 12 years!

I am honored to have taken part in the development of higher performing cabling to support the different generations of Ethernet standards with some vital principles staying the same.


Tags: Ethernet

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