Classification and Specification of Ethernet Cables


An Ethernet cable is one of the most popular forms of network cables used on wired networks for the purpose of transmitting network information. The commonly seen Ethernet cables are twisted pair cables, which can be divided into two categories: shielded twisted pairs (STP) and unshielded twisted pairs (UTP). In general, the most commonly used are unshielded twisted pairs which consist of four thin copper wires with each pair of copper wires twisted together, each copper wire wrapped in colored plastic insulating layer, and wrapped with a layer of plastic coat as a whole. Unshielded twisted pairs adopt RJ-45 interfaces, so they are also called RJ-45 cables. Normally, UTPs can be classified into 5 types: Cat5, Cat5e, Cat6, Cat6a, and Cat7. This post will explain the classification of UTPs and differences between them in detail.


Cat5 provides performance of up to 100 MHz and is suitable for most varieties of Ethernet over twisted pair. Cat5 is mainly applied to 10BASE-T, 100BASE-TX (Fast Ethernet), and 1000BASE-T (Gigabit Ethernet), and also used to carry other signals such as telephony and video. Cat5 has a long evolution history, and it’s developed based on Cat1, Cat2, Cat3, and Cat4. Cat1 is used for telephone communication, but not suitable for data transmission. Cat2 can be used for data transmission, the maximum speed of which is 4Mbps. Cat3 is used for 10BASE-T Ethernet, and the maximum speed of data transmission is 10Mbps. Cat4 is used for token ring and 10BASE-T/100BASE-T network with the maximum speed of data transmission being 16Mbps.



Cat5e (Cat5 enhanced) is an enhancement over Cat5, and has superseded Cat5 since 2001. It’s designed to greatly reduce crosstalk. Compared to Cat5, Cat5e is better at keeping signals on different circuits or channels from interfering with each other, and it has higher SNR (Signal to Noise Ratio), smaller delay error, and greater performance. It can handle 1000 Mbps speeds (gigabit Ethernet) at 100 MHz and it’s used for 1000BASE-T.



Cat6 is a major improvement over Cat5e. It has stronger resistance to signal interference. It’s suitable for up to 10 gigabit Ethernet at 250 MHz. Compared with Cat5 and Cat5e, Cat6 features more stringent specifications for crosstalk and system noise. To better tackle the problem of crosstalk, Cat6 installs an internal separator that isolates pairs from one another, and it has greatly improved the performance in echo loss. When used for 10/100/1000BASE-T, the maximum allowed length of a Cat6 is up to 100 meters (328 ft). For 10GBASE-T, an unshielded Cat6 should not exceed 55 meters.

Cat6 twisted pair


Cat6a (or Augmented Cat6) is capable of supporting data transmission rates of up to 10Gbps at a maximum bandwidth of 500MHz, twice that of Cat6. Compared to Cat6, Cat6a has improved strikingly, especially in the aspect of alien crosstalk. Since Cat6a has additional and tighter twists with additional insulation to reduce crosstalk, it has exhibited high alien noise in high frequencies. Besides, the size and weight of Cat6a have been reduced and slimmed down by 10% so as to make room for cable bend radius in the cable tray, patch panel and behind a wall outlet.

CAT 6a


Cat7 UTP, informal name for the ISO/IEC 11801 Class F cable standard, is a kind of twist pair, and it is not currently recognized by TIA/EIA. It’s designed to support data transmission rates of up to 10Gbps at a maximum bandwidth of 600MHz over 100 m of copper cabling, 6 times larger than Cat5e and 2.4 times larger than Cat6.



Hopefully, this brief guide will help you get to know your Ethernet cables. If you would like to know more or would like assistance in choosing the right cabling infrastructure, welcome to visit our website for more detailed information. FS will provide more choices and better services for our clients.

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