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A category 3 cable. Category 3 cable, commonly known as Cat 3 or station wire, and less commonly known as VG or voice-grade [1] (as, for example, in 100BaseVG), is an unshielded twisted pair (UTP) cable used in telephone wiring.
The current revision includes Category 5e (100 MHz), 6 (250 MHz), 6A (500 MHz), and 8 (2,000 MHz). Categories 7 and 7A were not officially recognized by TIA and were generally only used outside the United States. Category 8 was published with ANSI/TIA‑568‑C.2‑1 (June 2016) [9] to meet the performance specification intended by Category 7.
Standardized as IEC 61076-3-124, its nominal bandwidth is 500 MHz (Cat 6A). Single-pair Ethernet defines its own connectors: IEC 63171-1 LC : [ 5 ] This is a 2-pin connector with a similar locking tab to the modular connector, if thicker.
Most wired Ethernet communications are carried over Category 5e or Category 6 cable terminated with 8P8C modular plugs. The connector is also used in other telecommunications connections, including ISDN and T1. Where building network and telephone wiring is pre-installed, the center (blue) pair is often used to carry telephony signals. While ...
8P8C wiring (ANSI/TIA-568 T568A) Pin Pair Wire Color 1: 3 +/tip white/green 2: ... 100BaseVG was an alternative design using category 3 cabling and a token concept ...
CX4/SFF-8470/IEC 61076-3-113 Designed to support short distances over copper cabling, it uses InfiniBand 4x connectors and CX4 twinaxial cabling and allows a cable length of up to 15 m. Was specified in IEEE 802.3ak-2004 which has been incorporated into IEEE 802.3-2008. Shipping has all but stopped in favor of 10GBASE-T and SFP+ direct attach.
The significance of each category or class is the limit values of which the Pass/Fail and frequency ranges are measured: Cat 3 and Class C (no longer used) test and define communication with 16 MHz bandwidth, Cat 5e and Class D with 100 MHz bandwidth, Cat 6 and Class E up to 250 MHz, Cat6A and Class EA up to 500 MHz, Cat7 and Class F up to 600 ...
IEEE 802.3 is a working group and a collection of standards defining the physical layer and data link layer's media access control (MAC) of wired Ethernet. The standards are produced by the working group of the Institute of Electrical and Electronics Engineers (IEEE).