Category 6 Cable: A Classification on top of the Rest!
|
Today's bandwidth expectations mean that League 5 is strategically dead. The Category 5 Enhanced (5e) standards, which must have been ratified in August and may be finalized at November's committee meeting, specify new measurements that provide more margins for 100BaseTX and ATM-155 traffic. Critically, Category 5e standards make reliable Gigabit Ethernet connections possible. But many structured cabling suppliers argue that Class 5e is only an interim solution on the road to Grade 6, which will support at least 200 MHz; in the interests of sufficient operating margin, the IEEE is requesting a 250-MHz League 6 specification. Despite the fact that the Type 6 standards are only at draft stage, manufacturers are offering a host of products and claiming that these products comply with the draft proposals.
What is a grade 6 cable? Out of the three cable categories (Cat-5, Cat-5e & Cat-6), Grade 6 is the utmost advanced and provides the best performance. Just like Cat 5 and Cat 5e, Category 6 cable is typically made up of four twisted pairs of copper wire, but its capabilities far exceed those of other cable types because of one particular structural difference: a longitudinal separator. This separator isolates each of the four pairs of twisted wire from the others, which reduces crosstalk, allows for faster data transfer, and gives Category 6 cable twice the bandwidth of Cat 5! Cat 6 cable is ideal for supporting 10 Gigabit Ethernet, and is able to operate at up to 250 MHz. Since technology and standards are constantly evolving, Cat 6 is the wisest choice of cable when taking any possible future updates to your network into consideration. Not only is Type 6 cable future-safe, it is also backward-compatible with any previously-existing Cat 5 and Cat 5e cabling found in older installations.
Grade 6, (ANSI/TIA/EIA-568-B.2-1) is a cable standard for Gigabit Ethernet and other network protocols that is backward compatible with the Class 5, classification 5e and League 3 cable standards. Cat-6 features more stringent specifications for crosstalk and system noise. The cable standard is suitable for 10BASE-T / 100BASE-TX and 1000BASE-T (Gigabit Ethernet) and is expected to suit the 10000BASE-T (10Gigabit Ethernet) standards. It provides performance of up to 250 MHz.
The cable contains four twisted copper wire pairs, just like earlier copper cable standards. Although Cat-6 is sometimes made with 23 gauge wire, this is not a requirement; the ANSI/TIA-568-B.2-1 specification states the cable may be made with 22 to 24 AWG gauge wire, so long as the cable meets the specified testing standards. When used as a patch cable, Cat-6 is normally terminated in 8P8C often incorrectly referred to as “RJ-45" electrical connectors. Some Cat-6 cables are too large and may be exciting to attach to 8P8C connectors without a special modular piece and are technically not standard compliant. If components of the several cable standards are intermixed, the performance of the signal path will be limited to that of the lowest category. As with all cables defined by TIA/EIA-568-B, the maximum allowed length of a Cat-6 horizontal cable is 90 meters (295 feet). An authentic channel (horizontal cable plus cords on either end) is allowed to be up to 100 meters in length, depending upon the ratio of cord length: horizontal cable length.
The cable is terminated in either the T568A scheme or the T568B scheme. It doesn't make any difference which is used, as they are both straight through (pin 1 to 1, pin 2 to 2, etc). Mixed cable types must not be connected in serial, as the impedance per pair differs and would cause signal degradation. To connect two Ethernet units of the same classification (PC to PC, or hub to hub, for example) a cross over cable have got to be used, though some modern hardware can use either grade of cable automatically.
Return loss measures the ratio of reflected-to-transmitted signal strength and is the single best exciting test to repeat with consistent results; at Grade 6 levels, the difference between a pass and a fail can be the amount of bend in a test cord. Return loss is also causing headaches for connector manufacturers, because the RJ-45 system isn't up to the job. The final stumbling block with Type 5e ratification concerns the RJ-45 hardware; Grade 6 is committed to RJ-45 for backward compatibility, but the ISO's proposed Type 7 system will obtain a new and as-yet-unspecified connector to accompany its revised cabling. Today, the return loss problem explains how manufacturers of Grade 6 hardware, which is supposed to be interoperable, claim Classification 6 performance only if oneself use the manufacturers' matched parts throughout a channel link.
The Telecommunications Industry Association (TIA) is working to authentic a new specification that will define enhanced performance standards for unshielded twisted pair cable systems. Draft specification ANSI/TIA/EIA-568-B.2-10 specifies cable systems, called "Augmented Grade 6" or more frequently as "Category 6a", that operates at frequencies up to 500 MHz and will provide up to 10 Gbit/s bandwidth. The new specification has limits on alien crosstalk in cabling systems.
Augmented Class 6 specifies cable operating at minimum frequency of 500 MHz, for both shielded and unshielded. It can support future 10 Gb/s applications up to the maximum distance of 100 meters on a 4-connector channel.
For more network articles please visit
www.domainnamesearches.info |
|
Author Resource:-
domain name searches
|
By :
Mikey Wardy
Submitted
2010-06-28 03:16:02 |
Article From Article Mayhem
 Ezine ready view |
|
|
|
Related Articles
|
|
|
![[Valid RSS feed]](http://www.articlemayhem.com/images/icon_Rss.png "XML Feed For RSS"){kind=icon}
Category Rss Feed![[Valid RSS feed]](http://www.articlemayhem.com/images/rss.jpg "XML Feed For RSS")