UTP

UTP   สายแลน เป็นสายสัญญาณสำหรับใช้ในอุตสาหกรรมคอมพิวเตอร์ในการรับส่งข้อมูล ภาพ วีดีโอ อ้างอิงตามมาตรฐาน TIA และ ISO

The standard defines categories of shielded and unshielded twisted pair cable systems, with different levels of performance in signal bandwidth, insertion loss, and cross-talk. Generally increasing category numbers correspond with a cable system suitable for higher rates of data transmission. Category 3 cable was suitable for telephone circuits and data rates up to 16 million bits per second. Category 5 cable, with more restrictions on attenuation and cross talk, has a bandwidth of 100 MHz.^[6] The 1995 edition of the standard defined Categories 3, 4, and 5. Categories 1 and 2 were excluded from the standard since these categories were only used for voice circuits, not for data.^[7] 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) ^[8] to meet the performance specification intended by Category 7.