Since the approval of 10G 802.6ae standard for fiber optic cable, in 2002, a working committee for 10GBASE T was set for studying the feasibility of running 10Gbps over 100m drive distance. This is a horizontal cabling system advocated by TI568-B and ISO/IEC 11801 for Cat 6 E class or better system in support of future gigabit applications. Each cable pairs are able to offer bidirectional transmission rate of 2.5Gps, thus making up of 10Gpbs for 4 pairs
At the very beginning, IEEE 802.3an working committee followed the old PAM encoding mechanism adopted in 100Base-T for the encoding method of the physical layer for 10G Base-T. PAM5 takes 5 different signals balancing in replacement of the 2 digit encoding methods, thus making the best use of the bandwidth. Based on PAM5 in 10GBase-T, the required bandwidth is 625 Mhz. In June 2004, TIA revised the testing frequency from 625 Mhz to 500 Mhz, and to increase immunation and reducing the requirement for laser source, the encoding method was changed to PAM8, supporting 833 Mb and data rates in series and 400 Mhz bandwidth. The bandwidth for 10G system is revised to 500 Mhz and the Shannon capacity required for LDPC encoding is reduced to 15.9Gbps.
To support the IP application, in 2005 Caledonian launched out Matrix6E cabling system. Matrix 6E is a system design based on Cat6/E class, in compliant with IEEE 802.3an standard. Caledonian unshielded 10G cable can run 55-100 meters for 10GBase-T. As compared to shielded cable, the installation of UTP is much easer and the cost is much lower. However, at higher frequency, UTP cable will be limited by its technology for insertion loss and ANEXT performance. In 10G application, where frequency is very high, ANEXT is the most concern. ANEXT is the interference between one cable pairs and the adjacent pairs in another cable bundle. ANEXT greatly interferes the transmission and data transmission. Unlike NEXT, ANEXT cannot be eliminated by other active equipment. Currently, ANEXT is measured by testing the worst value s for a 4 pairs cable under 6 in 1 bundles environment
At present, it is still not possible to carry out field measurement for ANEXT in either permanent link or channel testing. But Caledonian 10G cables and components has already been designed in consideration of the ANEXT margin. The NEXT of each pairs within a cable will changes according to different data rates, signal level and the twisting distance of each pair. In this regard, Caledonian redesign the cable structure and change the twisting distance using the separator, in order to reduce the interference between the different pairs, thus eliminating the ANEXT to a significant extent. The Caledonian Cat 6e UTP cables can offer Shannon capacity of over 16Gbps.
Caledonian 10G shielded system is based on Cat 7/F design, which can run video, voice and data in each individual pairs. It can support video up to 870 Mhz, and can transmit both voice and data inside the same cable. The transmission media for a shielded system is SFTP cable, which contains an overall screen with individually shielded pairs. This cable type can effectively screen out the electromagnetic interference and prevents the cable from emitting electromagnetic signals. It can also highly reduce the coupling attenuation in the adjacent cable pairs, thus providing high bandwidth and increasing balanced transmission ability
The aluminium screen can block out the electromagnetic signal and also prevent the cable from emitting signal to outside. And thus will not emit any signal to affect other cables. The drain wire does have the function of signal reflection, absorption and separation ability. It can isolate the copper conductors from the outside environment. Each cable inside the duct can run 10Gbps transmission speed without affecting each other. Generally, in a shielded system coupling attenuation will be used to measure the EMC ability of a cable. The NEXT values of a shielded 10G system are usually 20dB higher than unshielded 10G system.
Matix 6A system provides a 4 connector channel solutions, using impedance matching data jacks to work in harmony with patch panels, significantly increasing the margin for both the channel and permanent link testing. The centered design help improve the NEXT performance of the product
Shielded system provides much larger bandwidth than unshielded system. In general, in gigabit Ethernet, at least Shannon capacity of 15.9 Gbps is required for the transmission ability. Shannon capacity is basically the ability of able to carry data current which goes down as noise increases. Alien crosstalk is this type of noise. And for unshielded 10G system, only around 17-20 Gbps can be achieved for Shannon capacity and therefore the margin is not too great. But the Shannon capacity for a shielded system can achieve around 35 Gbps which is much higher than that for unshielded system
Caledonian can offer 10G cable for the gigabit applications. There are two options for selection One is to use Cat 6A10G cable which can run 10Gbps at 500 Mhz from 55 to 100m, depending on different cable design for the UTP cable. For the UTP cable type, comfortable drive distance will be 55m though higher driver distance can usually be achieved with the special design of the cable. Another is to use Cat 7/F class STP cable which can run 10Gbps over a full 100metres. This STP cable can even be suitable for future 650-1000Mhz high bandwidth application.
Matrix 6A 10G far exceeds the requirement TIA/EIA and ISO 11801, providing extra margin, to ensure sure pass in any handheld tester during the field site verification.. The typical NEXT value of Matrix 6A10G unshielded is around 3 dB whereas the worst value exceeds 1 dB. The typical ANEXT value of Matrix 6A unshielded is around 2 dB whereas the worst value exceeds 0 dB. The typical NEXT value of Matrix 6A10G shielded is around 3 dB whereas the worst value exceeds 1 dB. The typical ANEXT value of Matrix 6A10G shielded is around 8 dB whereas the worst value exceeds 6 dB
Matrix 6A10G system can work under 500 Mhz extended frequency, through the special design in support of horizontal cabling, the testing frequency is up to 500 Mhz in support of the future 10G applications. Every components in Matrix 6E 10G features special design in order to guarantee significant margin for offering a comfortable buffer in any harsh installation environment |
