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娲炲療琛屼笟璧勮 鍒嗕韩涓撲笟鐭ヨ瘑

娲炲療琛屼笟璧勮 鍒嗕韩涓撲笟鐭ヨ瘑

娲炲療琛屼笟璧勮 鍒嗕韩涓撲笟鐭ヨ瘑

娲炲療琛屼笟璧勮 鍒嗕韩涓撲笟鐭ヨ瘑

棣栭〉 鏂伴椈涓绩 鎶赌链枃绔�
杩斿洖

鏂伴椈涓绩

鑱旂郴鎴戜滑

  • 鍏ㄥ浗缁熶竴链嶅姟鐑嚎锛�

    134 1039 1245
    400-996-0787
    0755-8399 9818

  • 鑱旂郴閭锛�

    sales@faxytech.com

  • 鑱旂郴鍦板潃锛�

    娣卞湷宁傜鐢板尯鍗庡己鍖楄矾鍗庤仈鍙戝ぇ铡�602瀹�

10%闀垮害铡熷垯锛氱绂勫厠顿罢齿-1800鎴栬赌匘罢齿-1500鐨�10%闀垮害铡熷垯

绂忕鍏婦TX-1800鎴栬�匘TX-1500鐨�10%闀垮害鍘熷垯锛�10% rule for length 鈥� DTX CableAnalyzer锛�

浣犳槸鍚﹀湪浣跨敤绂忕鍏妇罢齿-1800鎴栬赌匘罢齿-1500鐨勬椂鍊欓暱搴︿细瓒呭嚭鏍囧噯鏋侀檺鍊硷紵


Example1:

(The display here is from?DTX Version 2.74, have you updated your DTX CableAnalyzer?)


1.gif    


杩欎釜缁撴灉鏄鐨勫悧锛熻繖闀垮害宸茬粡瓒呭嚭浜�90惭銆�


浠嶢狈厂滨/罢滨础-1152宸ヤ笟鏍囧噯锛屾垜浠彂鐜帮细


4.2.3.1鏃犺閫熷害鍜岀数纾侀赌熷害銆�


4.2.3.1 Physical length vs.?electrical length

The pass or fail criteria is based on the maximum length allowed for the channel or permanent link as specified in ANSI/TIA-568-C.2 plus the nominal velocity of propagation (NVP) uncertainty of 10 %.


閫氳繃鍜屽け璐ョ殑鍒ゆ柇鏍囧噯鏄緷鎹瓵NSI/TIA-568-C.2 閫氶亾鍜屾案涔呯殑鏍囧噯鍔犱笂NVP閫熷害鐨�10%涓嶇‘瀹氭�с��

This means that although the limit is 90.0 m (295 ft), the tester will not fail the length parameter until the shortest pair of the four pairs has exceeded 90 m + 10 % (99 m) or 295 ft + 10% (325 ft). In the example above, the shortest pair was 92.5 meters, less than the 90 m + 10 % permitted by this standard.


杩欏氨鎰忓懗鐫赌灏界鏋侀檺鏍囧噯鏄�90惭锛屼絾鏄疍罢齿-1800鎴栬赌匘罢齿-1500鏄剧ず92.5惭锛屽皬浜�90惭+10%鐨勫厑璁搁噺銆�


Many customers do not like/agree with this feature. However, your DTX-1800鎴栬�匘TX-1500 CableAnalyzer is standards based. Whilst Fluke Networks may not necessarily agree with the 10 % fudge rule, the industry agreed to this. We implement the standard as is. THIS IS NOT AN EXCUSE TO GO BEYOND 90 m!!!!!!!!!!! If the cable is marginally compliant, insertion loss will fail before length fails.


璁稿瀹㈡埛涔熻瑙夊緱涓嶅悓鎰忎絾鏄绂勫厠顿罢齿-1800鎴栬赌匘罢齿-1500鏄牴鎹爣鍑嗘潵鐨勩赌傜绂勫厠缃戠粶鐨勮澶囦篃璁告病链夊繀瑕佸挩璇�10%闀垮害铡熷垯锛屼絾鏄伐涓氭爣鍑嗘敮鎸侊紝鎵赌浠ワ紝鎴戜滑鏍规嵁鏍囧噯鍒跺畾浜嗐赌�


This rule applies to channel limits as well where the length limit is 100 m (328 ft). However, because of clause?4.2.3.1 in the standard, the length test will not fail until the shortest pair of the four pairs measured exceeds 100 m + 10 % (110 m) or 328 ft + 10% (361 ft).


It is important to understand that we used the shortest pair to report the length of the link. Again, this is detailed in clause 4.2.3.1 of ANSI/TIA-1152.


When physical length is determined from electrical length, the physical length of the link calculated using the pair with the shortest electrical delay shall be reported and used for making the pass or fail decision.


Example 2: 

(The display here is from DTX Version 2.74, have you updated your DTX CableAnalyzer?)


    2.gif


Here we see that the shortest pair is 7,8 with a length of 97.9 m and hence a PASS since it does not exceed the 90 m limit by more than 10%. The other two pairs did exceed 90 m plus 10% and are marked I for Information Only but are not used for uating the link.


鎴戜滑閫氳绷涓婂浘鍙互鐪嬪埌顿罢齿-1500鏄剧ず鐨�7.8绾垮鏄�97.9惭锛岀粨鏋沧樉绀烘槸閫氶亾銆傚洜涓哄畠娌℃湁瓒呰绷90惭鐨勭櫨鍒嗙櫨涔嬪崄銆傚叾浠栦袱瀵圭嚎璺凡缁忚秴杩囦简10%骞朵笖鏍囱浜咺瀵逛簬鍙傝赌冿紝浣嗘槸鎴戜滑娌℃湁璇勪环娌℃湁鐢ㄤ綔璇勪环瀵硅繖鏉￠摼璺赌�


Example 3:

 If the pair with the shortest length exceeds 90 m plus 10%, then length is reported as FAIL (shown below).


濡傛灉鎵赌链夌殑閮芥樉绀鸿秴杩�90惭+10%锛岄偅涔堝畠灏变细鏄剧ず澶辫触浜嗐赌�

3.gif

鐩稿叧浜у搧锛�1锛�
DTX-1800

绂忕鍏婩luke DTX-1800绾跨紗鍒嗘瀽浠�
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罢别办迟谤辞苍颈虫/娉板厠
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厂鲍惭滨罢翱惭翱/浣忓弸
Baker Hughes/璐濆厠浼戞柉
颁搁驰厂翱鲍狈顿/鍏嗗崕鐢靛瓙
娉曞浗颁.础
驰翱碍翱骋础奥础/妯渤
贵耻箩颈办耻谤补/钘や粨
浜у搧鍝佺被
缃戠粶浠〃
娓╁害娴嬮噺
鐢垫皵浠〃
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鐜娴嬭瘯浠〃
链烘缁存姢
閰崭欢/宸ュ叿
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浜ら赌氳繍杈�
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閲戣瀺琛屼笟
链嶅姟鏀寔
缁翠慨链嶅姟
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瑙嗛涓绩
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鏂伴椈涓绩
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鎶赌链枃绔�
鍏充簬杩炶
鍏充簬鎴戜滑
璧勮川灞旷ず
鑱旂郴鎴戜滑

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