美國BELDEN雙絞線   
型號:8723  060(CHR) 1000FT 305MTR  規格:22AWG (.32SQ MM)  顏色:灰色
傳輸線一般用在電腦網路的內部配線，如把電腦連接至乙太網、或電腦連接電腦、集線器連接路由器等。此外，還可以用作話音通訊、令牌環（記號環網路、token ring）、非同步傳輸模式（Asynchronous Transfer Mode）的傳輸

百通（belden）8723 電纜主要是一款遮罩雙絞線對線纜（即Shielded Twisted Pair Cable）。本電纜是2對22AWG多股絞合鍍錫銅製成的導體，PEP絕緣介質，整體採用Beldfoil® 100%覆蓋遮罩，工業PVC外護套。符合UL 1685 (30 V 80°C)檔規範。

雙絞線是綜合佈線工程中最常用的一種傳輸介質。

雙絞線採用了一對互相絕緣的金屬導線互相絞合的方式來抵禦一部分外界電磁波干擾，更主要的是降低自身信號的對外干擾。把兩根絕緣的銅導線按一定密度互相絞在一起，可以降低信號干擾的程度，每一根導線在傳輸中輻射的電波會被另一根線上發出的電波抵消。

 

工作溫度範圍: -20°C 至 +60°C。

建議最大拉力：19.051KG。

線對顏色組合是黑色/紅色條、綠色/白色條。

Product Description Audio, Control & Instrument Cable, 22 AWG stranded (7x30) tinned copper conductors, polypropylene insulation, twisted pairs, individually Beldfoil® shielded (100% coverage), 24 AWG stranded tinned copper drain wire, PVC jacket. Technical Specifications
Physical Characteristics (Overall)
Conductor AWG Stranding Material No. of Pairs 22 7x30 TC - Tinned Copper 2
Conductor Count: 4
Insulation Material Nominal Wall Thickness PP - Polypropylene 0.009 in
Color Chart Number Color 1 Red & Black 2 Green & White
Inner Shield Material Type Material Material Trade Name Coverage [%] Drainwire Material Drainwire AWG Drainwire Construction n x D Tape Aluminum Foil-Polyester Tape Beldfoil® (Z-Fold®-foil side out) 100 % TC - Tinned Copper 24 7x32
Outer Shield Material Material Unshielded
Outer Jacket Material Material Nominal Diameter Nominal Wall Thickness PVC - Polyvinyl Chloride 0.16 in 0.02 in
Electrical Characteristics
Conductor DCR Individual Pair Nominal Shield DCR Nominal Conductor DCR 15 Ohm/1000ft 14.7 Ohm/1000ft
Capacitance Nom. Capacitance Conductor to Conductor Nom. Capacitance Conductor to Other Conductor to Shield 33 pF/ft 62 pF/ft
Inductance Nominal Inductance 0.17 µH/ft
Impedance Nominal Characteristic Impedance 52 Ohm
High Frequency (Nominal/Typical) Nom. Insertion Loss 10 dB/100m
Delay Nominal Velocity of Propagation (VP) [%] 66 %
Current
Max. Recommended Current [A] Per conductor @ 25°C (10C temperature rise): 2.3 A
Voltage UL Voltage Rating 300 V RMS
Temperature Range
UL Temp Rating: 60°C Operating Temp Range: -20°C To +75°C
Mechanical Characteristics
Bulk Cable Weight: 17 lbs/1000ft Max Recommended Pulling Tension: 42 lbs Min Bend Radius/Minor Axis: 1.75 in
Standards
NEC Articles: 800 NEC/(UL) Specification: CM CEC/C(UL) Specification: CM CPR Euroclass: Ec