在整个网络布线中应用一种布线方式，但两端都有RJ－45插口的网络连线无论是采用568A标准，还是568B标准，在网络中都是可行的。双绞线的顺序与RJ45头的引脚序号—一对应。10M以太网的网线使用1、2、3、6编号的芯线传递数据，而100M网卡需要使用四对线。
产品标准：YD/T产品型号：ZA-RVV（ZRRVVZRVVRRVVZ）通信电源用阻燃软电缆ZA-RVV22（ZRRVV22ZRVVR22RVVZ22）通信电源用阻燃钢带铠装软电缆本产品适用于架空、管道、室内电缆沟、地下直埋。
符合MT818煤矿用阻燃电缆及MT386所要求的阻燃性能。1．2矿用阻燃控制电缆适用于煤矿的控制回路、监控回路和保护线路等，要求阻燃的固定和移动类场合。3、使用特性额定电压U0/U：450/750V及以下。
Our products are widely used in all major coal mine systems and coal mine monitoring systems. Sales to coal companies and mining groups throughout the country; And become a number of mining equipment companies supporting products, established long-term cooperation relations, products have been users praise and trust! The city at the same time my company production of all plastic communication cable, telephone cable, big logarithmic communication cable, computer cable, power cord of communication equipment and railway signal cable, airport with flare path, various documents are complete, reliable quality!!!!!
MKVV芯)×（0.75-2.5mm2）煤矿用铜芯聚氯乙烯绝缘聚氯乙烯护套细钢丝铠装阻燃控矿用制电缆敷设在能承受较大机械拉力的固定场合用于煤矿竖井作控制传输用.天津市电缆总厂第一分厂专业生产研发矿用通信电缆；矿用控制电缆；矿用信号电缆；煤矿用通信电缆；煤矿用控制电缆；煤矿用信号电缆；矿。
假设前三个环节都没有问题，那么零线断开有哪些特征：当灯开关闭合时，荧光灯时不时一闪一闪的，或LED灯珠有微弱的光亮，拆开连接灯具两根线的绝缘胶带，用试电笔测试，都有＂电＂，即氖管发光。具体维修方法：确定此灯在配电箱中属于哪个断路器控制（假设分支回路按空间分组）；如果仅仅是这一盏灯不亮，那么，卸下控制灯的开关面板，查看零线连接是否良好；版权所有如果这一回路的灯全部不亮，或插座全部不能正常用电，则说明零线在配电箱没接好；如果这一回路只有一部分能正常用电，那么，＂推测＂暗敷线的走向，卸下＂最后一个＂能正常用电的面板，查看零线连接是否良好；卸下＂最先一个＂不能正常用电的面板，查看零线连接是否良好。
4、带米标识，分100米、200米、300米包装，500米、1000米木轮包装。5．如用屏蔽编织线和屏蔽箔，应在两端与保护接地连接，并通过尽可能的大面积屏蔽接线来复盖，以保持良好的传导性。另外建议数据线必须与高压线隔离。
RS485 wiring can be arbitrary layout into star connection with tree, 485 wiring specification is the wiring must be hand in hand, when there is no use 485 hub and 485 relay setting directly into the star connection and connection in a tree, it is easy to cause reflection bus no. Many contractor in 485 wiring, use of star connection and tree, sometimes the very, but sometimes is always appear problem, and it is difficult to find the reason, is usually caused by non-standard wiring. If star connection or tree connection is required due to field connection, the 485 hub and 485 relay of shenzhen fuyongtong technology co., LTD can be used to solve related problems.
Our factory was founded in 1971, is a production and sales of various kinds of flame retardant communication cable, shielded cable for mine, mine screen communication cable, mine telephone cable, shielding signal cable for mine, mine fire retardant signal cable, flame retardant signal cable, mining flame-retardant control cable, communication cable, mining cable, flame retardant mine communication cable, mine, mine communication cable, signal cable, mining control cable, cable for mine monitoring, sensors, cable, signal cable, control cable, computer cable, flame retardant cable, shielded cable. City communication cable, railway signal cable, power line, electrical equipment wire and cable, video line, system special cable. And other professional manufacturers. Companies with more than 300 employees, engineering and technical personnel more than 30 people, the factory covers an area of 20000 square meters, with fixed assets of 15 million yuan, the total number of companies have production and inspection equipment more than 120 units (pieces), annual output value of 150 million yuan.
三、型号、名称、用途型号名称主要使用范围MHYVP煤矿用聚乙烯绝缘编织屏蔽聚氯乙烯护套通信电缆用于电场干扰较大的场所作信号传输，适用于固定敷设四、产品主要技术指标项目单位指标0.40.751.01.520℃时导体直流电阻不大于Ω/km43.824.518.112.1电。
绝缘线对：将绝缘单线按规定的色谱、不同的节距均匀地绞合成线对。缆芯结构：绝缘单线绞合成对后采用同芯式或单位式绞合成缆芯，各单位采用不同的扎纱，以便施工、维护识别。缆芯包带：缆芯外包覆非吸湿性、非吸油性的绝缘带。
It is suitable for the control and control circuit with rated ac voltage u0/u of 450/750v or below and the connecting line of the electrical instrument in the protection line and the distribution device. Implementation standards: mt818-2009.1 mt386-1995 Q/ tx001-2006 strictly comply with relevant regulations on coal mine safety.
可以把负反馈电路当成上面说的利用三极管的射极输出来稳压的三极管稳压电路，只不过负反馈电路在三极管基本放大电路中的作用主要还是用于稳定Ice的（注意：千万不要把负反馈电路理解成用于抑制β变化的），它只是用于稳定Ice的。具体什么原理可以参考三极管稳压电路的原理，当然后面也会提到负反馈电路的稳定Ice的原理。负反馈电路使输出波形具有收敛性（就是稳定在一定范围内）（至于具体的以后会提到现在的技术水平还不适合讲），对于负反馈的作用具体可以参考上面讲的三极管稳压电路。
HJVVHJVVP0.4-0.8mm5芯-200芯用于配线架至交换机或交换机内部各级机器间连接等（包括农村电话局用）。4、使用特性：电缆敷设环境温度不低于-5℃。电缆的弯曲半径不得低于电缆外经的20倍。
VV22VLV22聚氯乙烯绝缘钢带铠装聚氯乙烯护套电力电缆 敷设在室内、隧道及直埋土 壤中，电缆能承受压力和其他外 。
Integrated stranded railway signal cable implementation standard GB/ t2476-1993. Railway signal cables are suitable for transmission of railway control signals, audio signals or fixed cables for fixed installation in rated voltage ac 500V or dc 1000V or below. Product name, model, specification and scope: plastic insulation and PVC sheathed railway signal cable PTYAH; PTYA; PZYA; PTYV; PTYY,; PTY22; PTY23; (PZY02; PZY03; PZY23 PZY22) 1/0.8mm (1/1.0mm) 2-48 core is suitable for railway signal communication, fire alarm signal, telegraph and other automatic device systems with rated voltage ac 500V or dc 1000V or below.
JYP2V－1JYP2V－2JYP2V－3多对屏蔽控制电缆电子计算机(包括DCS系统)用多对屏蔽控制电缆执行标准：企业标准(等效采用英国BS5308—86)用途：适用于发电、冶金、石化等上矿企业集散系统、电子计算机系统、自动化系统的信号传输及检测仪器、仪表等连接用多对屏蔽电缆。