欢迎光临中国销售中心 在线留言 收藏本站 网站地图 联系连讯达
全国服务热线0755-83999818
当前位置:首页 ? 技术支持 » 温度对插入损耗的影响,温度越传输距离越短

温度对插入损耗的影响,温度越传输距离越短

文章出处:深圳市连讯达电子技术开发有限公司 人气:-发表时间:2020-07-02 14:30:00

The Insertion Loss limits found in ANSI/TIA, ISO/IEC and IEEE are based on the link operating at 20 oC (68 oF). As temperature increases, you can expect the Insertion Loss of your link to increase too. Failing to take this into account in your design may result in transmission errors. In some cases, the intended application may not work.


The cabling standards provide excellent guidance on this subject. You are encouraged to purchase these online at either https://global.ihs.com or http://www.iso.org.


ANSI/TIA-568-C.2 Annex G
Cables may be installed in return air plenums, in ceiling spaces, riser shafts and non air-conditioned buildings such as warehouses and manufacturing plants where the temperature can be significantly higher than 20 oC. In order to ensure compliance with the channel insertion loss specified in clause 6.2.7, the horizontal cable distance may need to be reduced below 90 meters depending upon the average temperature of the environment over the length of the cable, the insertion loss margin of the installed cabling, and the insertion loss temperature coefficient of the cable.


ISO/IEC 11801:2011 Table 32 – Horizontal channel length equations
For operating temperatures above 20 oC, H should be reduced by 0,2 % per oC for screened cables; 0,4 % per oC (20 oC to 40 oC) and 0,6 % per oC (>40 oC to 60 oC) for unscreened cables. Where H is length.


This ANSI/TIA-568-C.2 standard goes on to provide additional guidance in the form of a table:


温度(°C /°F))

最大非屏蔽电缆长度(m)

最大屏蔽电缆长度(m)

长度减少 非屏蔽(m)

长度减少 屏蔽(m) 
20 (68)909000
25 (77)8989.510.5
30 (86)8788.531.5
35 (95)85.587.74.52.3
40 (104)848763
45 (113)81.786.58.33.5
50 (122)79.585.510.54.5
55 (131)77.284.712.85.3
60 (140)7583156


Fluke Networks does not allow you to adjust the Insertion Loss in any of its field testers based on temperature.Some field testers allow you to adjust the insertion loss PASS/FAIL line based on temperature. This is not permitted per ANSI/TIA, ISO/IEC and IEEE. If your cable is to be subjected to an elevated temperature, your design must take this into account by reducing the length of the link, not by relaxing the Insertion Loss limit.


此文关键字:fluke,福禄克,网络测试仪,光纤测试仪,网线测试仪,万用表,红外热像仪,深圳连讯达,深圳市连讯达电子技术开发有限公司
赌场游戏手机版