作為線纜行業從業者,相信大家非常熟悉乙太網絡線纜,比如說超五類網線、六類網線和七類網線等等,但是您知道Cat8 八類網線是什麼嗎?它與之前的各類版本有何差異,今天大家一起來扒扒它與Cat5、Cat6、Cat7網線的區別.
八類網線是什麼?【Category 8】
Category 8 was ratified by the TR43 working group under ANSI/TIA 568-C.2-1. It is defined up 2000 MHz and only for distances from 30 to 36m depending on the patch cords used. ISO is expected to ratify the equivalent in 2018 but will have 2 options:
Class I channel (Category 8.1 cable): minimum cable design U/FTP or F/UTP, fully backward compatible and interoperable with Class EA (Category 6A) using 8P8C connectors
Class II channel (Category 8.2 cable): F/FTP or S/FTP minimum, interoperable with Class FA (Category 7A) using TERA or GG45 connectors.
Category 8 is designed only for data centers where distances between switches and servers are short. It is not intended for general office cabling.
八類網線是最新一代雙屏蔽(SFTP)的網絡跳線,它擁有兩個導線對,可支持2000MHz的帶寬,且傳輸速率高達40Gb/s,但它最大傳輸距離僅有30m,故一般用於短距離數據中心的伺服器、交換機、配線架以及其他設備的連接.
Cat8 八類網線的標準
Cat8 八類網線的相關標準由美國通信工業協會(TIA )TR-43委員會於2016年正式發布,具體如下:
1.符合IEEE 802.3bq 25G / 40GBASE-T標準,規定了Cat8 八類網線的最小傳輸速率,可支持25 Gbps和40 Gbps的網絡布線
2.符合ANSI / TIA-568-C.2-1標準,規定了Cat8 八類網線的通道和永久鏈路,並包含電阻不平衡、TCL和ELTCTL的限制
3.符合ANSI / TIA-1152-A標準,規定了Cat8 八類網線現場測試儀測量和精度要求
4.符合ISO / IEC-11801標準,規定了I/II 類Cat8 八類網線的通道和永久鏈路.
三種結構
八類網線第一種結構:每對屏蔽+鋁箔總屏蔽+外被
八類網線第二種結構:每對屏蔽+編織總屏蔽+外被
八類網線第三種結構:每對屏蔽+鋁箔總屏蔽+編織總屏蔽+外被
八類與Cat5、Cat6、Cat7網線的區別
Classes and categoriesThe standard defines several link/channel classes and cabling categories of twisted-pair copper interconnects, which differ in the maximum frequency for which a certain channel performance is required:
Class A: link/channel up to 100 kHz using Category 1 cable/connectors
Class B: link/channel up to 1 MHz using Category 2 cable/connectors
Class C: link/channel up to 16 MHz using Category 3 cable/connectors
Class D: link/channel up to 100 MHz using Category 5e cable/connectors
Class E: link/channel up to 250 MHz using Category 6 cable/connectors
Class EA: link/channel up to 500 MHz using Category 6A cable/connectors (Amendment 1 and 2 to ISO/IEC 11801, 2nd Ed.)
Class F: link/channel up to 600 MHz using Category 7 cable/connectors
Class FA: link/channel up to 1000 MHz using Category 7A cable/connectors (Amendment 1 and 2 to ISO/IEC 11801, 2nd Ed.)
Class I: link/channel up to 2000 MHz using Category 8.1 cable/connectors (specification under development)
Class II: link/channel up to 2000 MHz using Category 8.2 cable/connectors (specification under development)
The standard link impedance is 100 Ω (The older 1995 version of the standard also permitted 120 Ω and 150 Ω in Classes A−C, but this was removed from the 2002 edition).
The standard defines several classes of optical fiber interconnect:
OM1: Multimode fiber type 62.5 µm core; minimum modal bandwidth of 200 MHz·km at 850 nm
OM2: Multimode fiber type 50 µm core; minimum modal bandwidth of 500 MHz·km at 850 nm
OM3: Multimode fiber type 50 µm core; minimum modal bandwidth of 2000 MHz·km at 850 nm
OM4: Multimode fiber type 50 µm core; minimum modal bandwidth of 4700 MHz·km at 850 nm
OM5: Multimode fiber type 50 µm core; minimum modal bandwidth of 4700 MHz·km at 850 nm and 2470 MHz·km at 953 nm
OS1: Single-mode fiber type 1 dB/km attenuation at 1310 and 1550 nm
OS1a: Single-mode fiber type 1 dB/km attenuation at 1310, 1383, and 1550 nm
OS2: Single-mode fiber type 0.4 dB/km attenuation at 1310, 1383, and 1550 nm
【Cat6六類非屏蔽(UTP)網絡跳線,卡溝設計,黃色,PVC】
雖然目前Cat8 八類網線的應用並不廣泛,但隨著網絡布線對傳輸性能的要求越來越高,相信日後Cat8 八類網線會逐漸成為數據中心綜合布線系統的主流產品.
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