搜索

Product Details All Telecommunication Terminal and Server Electric 上一个产品 下一个产品 GP01-H61 The product is suitable for outdoor fiber optic cable overhead, pipeline and other straight-through splicing and divergence and other trunk fiber optic cable and common fiber optic cable network splicing. The use of double-ended horizontal design structure, the product has a high strength mechanical performance, high sealing performance, corrosion resistance, excellent weather resistance, etc., multi-cable port management, can be mechanically repeated to open; reasonable structure layout, construction operation is simple and fast. Application Scenario Outdoor overhead, pipeline, direct buried and other common fiber optic cable joint splicing, can be used for urban or urban and rural common fiber optic network splicing protection. Structure picture Performance characteristics 1、The shell is produced by injection molding process of high-quality engineering plastics, with anti-UV and anti-aging additives, high mechanical strength; 2、The box adopts double-ended optical cable in and out design structure, convenient overhead hanging rod and other openable structure; 3、the box body box cover using non-vulcanized rubber sealing structure, good airtightness; 4、Box with electrical disconnection or connection function, optional air nozzle; 5、high-capacity splicing, to meet the trunk or special fiber optic cable splicing protection; 7、termite resistance, acid and alkali resistant oil, resistance to extreme cold and high temperature environment need to order separate instructions. Technical parameters or parameters table 1、Adapted to the ambient temperature: -40℃~+65℃. 2、Atmospheric pressure: 70~106Kpa. 3、Axial tension: 〉1000N/1min or more. 4、flattening: the box is filled with 60 ± 5kpa air pressure, should be able to withstand 2000N/100mm lateral uniform pressure, the force time is not less than 1min, after the test joint box does not leak, no deformation, no damage. 5、impact: fiber optic splice box should be able to withstand a drop height of 1m, the mass of the steel ball 1.6Kg, the number of impacts for 3 times the impact. 6、bending: fiber optic splice box and fiber optic cable joints should be able to withstand bending tension load of 150N, bending angle ± 45 ° of 10 cycles of bending. 7、torsion: fiber optic splice box should be able to withstand a torque of not less than 50N-m, torsion angle ± 90 °, a total of 10 cycles of twisting. 8、Drop: The fiber optic cable connector box should be able to withstand 3 drops at a height of 2.2m, and after the test, the connector box should not leak, no deformation, no damage. 9、tensile strength: 〉2000N/10cm2 pressure, time 1min. 10、vibration: splice box to withstand vibration frequency of 10Hz, amplitude of ± 3mm, the number of vibration for 106 vibration, the fiber additional loss change value does not exceed 0.2dB. 11、Temperature cycle: -40℃~+65℃, internal air pressure 60(+5)Kpa, 10 times cycle, air pressure drop not more than 5kpa after room temperature. 12、fiber radius of curvature > 37.5mm, fiber fusion tray additional attenuation ≤ 0.01dB. Commonly used tools for construction cross cutter, tape measure, hexagonal wrench. 上一个产品 下一个产品

Product Details All Telecommunication Terminal and Server Electric 上一个产品 下一个产品 GJS03-M2AX-A8-24~96C(GP206) The product is suitable for outdoor optical cable overhead, pipeline and other straight-through splicing and divergence splicing, optical cable to meet the multi-divergence 2 into 8 out optical cable port management. The product has high strength mechanical performance, high sealing performance, strong corrosion resistance, excellent weather resistance, etc., can be mechanically repeated to open, high maintainability; reasonable structure layout, simple and quick construction operation. Application Scenario Outdoor overhead, pipeline and other common fiber optic cable joint splicing, can be used for urban or urban and rural common fiber optic network splicing protection. Performance characteristics 1、The shell is made of high-quality engineering plastic injection molding process, with anti-UV and anti-aging additives, high mechanical strength; 2、The box body adopts single-ended in and out of the optical cable design structure, easy to install overhead hanging rods and other barrels can be quickly opened for maintenance and repair; no tools are required to open the box body; 3、the shell and the bottom with silicone rubber sealing ring, optical cable mouth using temperature-resistant heat-shrinkable tube sealing, good airtightness; 4、Box with electrical disconnection or connection function, optional air nozzle; 5、compact size, more suitable in the pipeline or narrow space; 6、Multi-divergent structure design with 2-in and 8-out multi-optical cable management; 7、termite resistance, acid and alkali resistant oil, resistance to extreme cold and high temperature environment need to order separate instructions. Technical parameters or parameters table 1、Adapted to the ambient temperature: -40℃~+65℃. 2、Atmospheric pressure: 70~106Kpa. 3、Axial tension: 〉1000N/1min or more. 4、flattening: the box is filled with 40 ± 5kpa air pressure, should be able to withstand 2000N/100mm lateral uniform pressure, the force time is not less than 1min, after the test joint box does not leak, no deformation, no damage. 5、 impact: fiber optic splice box should be able to withstand a drop height of 1m, the mass of the steel ball 1.6Kg, the number of impacts for 3 times the impact. 6、bending: fiber optic splice box and fiber optic cable joints should be able to withstand bending tension load of 150N, bending angle ± 45 ° of 10 cycles of bending. 7、torsion: fiber optic splice box should be able to withstand a torque of not less than 50N-m, torsion angle ± 90 °, a total of 10 cycles of twisting. 8、Drop: The fiber optic cable connector box should be able to withstand 3 drops at a height of 2.2m, and after the test, the connector box should not leak, no deformation, no damage. 9、tensile strength: 〉2000N/10cm2 pressure, time 1min. 10、vibration: splice box to withstand vibration frequency of 10Hz, amplitude of ± 3mm, the number of vibration for 106 vibration, the fiber additional loss change value does not exceed 0.2dB. 11、Temperature cycle: -40℃~+65℃, internal air pressure 40(+5)Kpa, 10 times cycle, air pressure drop not more than 5kpa after room temperature. 12、fiber radius of curvature > 30mm, fiber splice tray additional attenuation ≤ 0.01dB. Commonly used tools for construction cross cutters, heaters or spray guns, sawyers, tape measures. Parameter table Model: GJS03-M1AX-144C(GP200) Box material: PP Adapt to the diameter of fiber optic cable: oval hole: 10-25mm; small hole: 6-25mm Number of cable entry ports: 2+4 Maximum capacity of fusion fiber tray (core): 24 Maximum number of fusion cores (cores): 144 Fiber optic residual fiber intake device: No Sealing method: mechanical + heat shrink seal Fiber into the end type and number: -- Product use environment: overhead, pipeline, buried 上一个产品 下一个产品

Product Details All Telecommunication Terminal and Server Electric 上一个产品 下一个产品 8 million intelligent outdoor gun camera MJ-AB801 Key selling points (1) Up to 8MP resolution (3840x2160) (2) Using the latest H.265 encoding compression technology (3) Support cell phone APP remote monitoring and control (4) Built-in AI algorithm (5) Support area intrusion when linking alarm audio (6) Support wireless network wifi6 access (7) Support full color, intelligent, infrared three night vision mode Each main parameter index Product key parameters 上一个产品 下一个产品

Product Details All Telecommunication Terminal and Server Electric 上一个产品 下一个产品 Electric vehicle capture camera QH-ESG201-PI Key selling points (1) Full HD 30fps high frame rate image output (2) Embedded intelligent deep learning electric vehicle detection algorithm (3) Built-in smoke sensor, support smoke recognition after linkage alarm and upload platform, and sound alarm (4) National standard products after various strict tests Each main parameter index Product key parameters 上一个产品 下一个产品

Product Details All Telecommunication Terminal and Server Electric 上一个产品 下一个产品 ODF rack Fiber optic wiring series products are suitable for central office, optical cross node, user fiber optic access network project in each optical access point, to complete the introduction of optical cable, fixed, open stripping protection, fiber fusion and protection, pigtail storage and management, optical fiber fixed connection and cross-connected functions, according to the function can be divided into line side fiber optic distribution frame, equipment side fiber optic distribution frame and fiber optic total distribution frame. Equipment-side fiber optic distribution frame, also known as intermediate distribution frame, is a fiber optic distribution frame that completes the connection, scheduling and debugging of different optical communication equipment in the communication room, and can also complete the storage of the excess length of patch cords at the line and equipment ends. Line side fiber optic distribution frame is the wiring connection equipment between fiber optic cable and optical communication equipment or between optical communication equipment. It is used for terminating and distributing fiber optic cables at the local end of the fiber optic communication system, which can easily realize the connection, distribution and scheduling of fiber optic lines, and is used in transmission network rooms, convergence rooms and access rooms. Product Benefits Equipment side fiber optic distribution frame (1) The frame is made of metal sheet welded as a whole, with integral molding and high mechanical strength. (2) Left and right jumping fiber series intermediate distribution frame, easy to operate, clear interface. (3) Front and rear patch panel series intermediate distribution frame, unit box structure, pigtail storage in the internal, overall beautiful. (4) Unit box panel opening angle greater than 100 degrees, easy to operate. (5) Snap-in adapter mounting for SC, FC, LC and other adapters. Line Side Fiber Distribution Frame (1) Fully enclosed structure, single-sided operation. (2) The frame is made of high quality cold-rolled steel plate, the whole welded structure, high strength, good rigidity; surface coating using electrostatic spraying process, corrosion resistance, beautiful appearance. (3) Modular structure, can be flexibly configured according to different requirements and achieve parallel rack installation. (4) Adopt 12-core fusion wiring integration module, each connection module can be withdrawn separately, easy to operate. Product Type Product usage Equipment-side fiber optic distribution frame: connection, scheduling, commissioning, storage. (1) Equipment side fiber optic distribution frame is to complete the connection, scheduling, commissioning and other functions of different optical communication equipment in the communication room (2) It is a kind of fiber optic patch panel that can complete the storage function of the excess length of patch cords at the line side and equipment side at the same time. Line side fiber optic distribution frame: outside fiber optic cable fusion splicing, termination, connection, scheduling and storage. (1) The line side distribution frame is used for terminating and distributing the backbone fiber optic cable at the local end of the fiber optic communication system. (2) The line-side distribution frame allows for easy connection, distribution, scheduling and storage of fiber optic lines. Product application tools Fiber melting machine, optical fiber cutting knife, OTDR tester, pen red light source, stripping pliers, power meter, anhydrous ethanol,, fiber cutting knife, oblique pliers, level, impact drill, screwdriver, optical power meter. Frequently Asked Questions What is the basis for choosing the size of the product? In choosing the size of the product in general several considerations; (1) is based on the installation location of the room around the specifications of other cabinets, choose the same or similar specifications so as to ensure visual unity; (2) according to the size of the installation location to determine the rack specifications; 3. according to the number of cores needed to choose. The above points need to be considered at the same time. How to choose the product adapter type-FC or SC? The choice is based on the type of adapter used with the other equipment used in the server room. How can I tell whether I need to choose a line-side distribution frame or a device-side distribution frame? The line side distribution frame is equipped with optical cable stripping fixed unit and 12-core fusion with integrated fusion fiber tray, which can realize the stripping of optical cable fixed and fiber fusion into the end; the equipment side distribution frame is not equipped with these two, the rack inside the configuration of the adapter, can not be stripped fixed and fiber fusion of optical cable. How can I tell if a rack is using ribbon or bundled fiber? According to the fiber optic cable used to choose, ribbon fiber optic cable then choose ribbon pigtail, bundle fiber optic cable choose bundle pigtail. How do I choose the color of the rack? The color of the rack is uniform and beautiful according to the color of other equipment inside the server room. 上一个产品 下一个产品

Product Details All Telecommunication Terminal and Server Electric 上一个产品 下一个产品 Face recognition temperature measurement all-in-one machine MJ30-2T07 Key selling points (1) Live detection: effective protection against attacks such as photos, videos and models (2) Mask detection: 85% accuracy of mask recognition, meeting the requirements of conventional mask detection, supporting mask wearing tips, and at the same time can be associated with access control; ±0.3℃; best detection distance 0.4m; support abnormal body temperature alarm (threshold value can be set) (3) IC card verification: support recognition of IC cards, NFC cards, etc (4) Health code verification: red/yellow code alarm, green code access (5) Voice announcement: support health code verification result, nucleic acid test result and time announcement, body temperature verification result announcement, and mask wearing prompt announcement Each main parameter index Product key parameters 上一个产品 下一个产品

Product Details All Telecommunication Terminal and Server Electric 上一个产品 下一个产品 GJS03-M1AX-24~144C-SRZJ14-W20(GP1405) The product is suitable for outdoor fiber optic cable overhead, pipeline and other straight-through splicing and divergence splicing. This product has the characteristics of high strength mechanical performance, high sealing performance, strong corrosion resistance, excellent weather resistance, etc., can be mechanically repeated to open, high maintainability; reasonable structure layout, simple and quick construction operation. Application Scenario Outdoor overhead, pipeline, direct buried and other common fiber optic cable joint splicing, can be used for urban or urban and rural common fiber optic network splicing protection. Performance characteristics 1、The shell is made of high-quality engineering plastic injection molding process, with anti-UV and anti-aging additives, high mechanical strength; 2、The box body adopts single-ended in and out of the optical cable design structure, easy to install overhead hanging rods and other barrels can be quickly opened for maintenance and repair; no tools are required to open the box body; 3、 the shell and the bottom with silicone rubber sealing ring, optical cable mouth using temperature-resistant heat-shrinkable tube sealing, good airtightness; 4、Box with electrical disconnection or connection function, optional air nozzle; 5、compact size, more suitable in the pipeline or narrow space; 6、Anti-termites, acid and alkali resistant oil, resistance to extreme cold and high temperature environments need to be specified separately in the order. Technical parameters or parameters table 1、Adapted to the ambient temperature: -40℃~+65℃. 2、Atmospheric pressure: 70~106Kpa. 3、Axial tension: 〉1000N/1min or more. 4、flattening: the box is filled with 40 ± 5kpa air pressure, should be able to withstand 2000N/100mm lateral uniform pressure, the force time is not less than 1min, after the test joint box does not leak, no deformation, no damage. 5、impact: fiber optic splice box should be able to withstand a drop height of 1m, the mass of the steel ball 1.6Kg, the number of impacts for 3 times the impact. 6、bending: fiber optic splice box and fiber optic cable joints should be able to withstand bending tension load of 150N, bending angle ± 45 ° of 10 cycles of bending. 7、torsion: fiber optic splice box should be able to withstand a torque of not less than 50N-m, torsion angle ± 90 °, a total of 10 cycles of twisting. 8、Drop: The fiber optic cable connector box should be able to withstand 3 drops at a height of 2.2m, and after the test, the connector box should not leak, no deformation, no damage. 9、tensile strength: 〉2000N/10cm2 pressure, time 1min. 10、vibration: splice box to withstand vibration frequency of 10Hz, amplitude of ± 3mm, the number of vibration for 106 vibration, the fiber additional loss change value does not exceed 0.2dB. 11、Temperature cycle: -40℃~+65℃, internal air pressure 40(+5)Kpa, 10 times cycle, air pressure drop not more than 5kpa after room temperature. 12、fiber radius of curvature > 30mm, fiber fusion tray additional attenuation ≤ 0.01dB. Commonly used tools for construction cross cutters, heaters or spray guns, sawyers, tape measures. Parameter table Model: GJS03-M1AX-24~144C-SRZJ14-W20(GP1405) Box material: PP Adapt to the diameter of fiber optic cable: elliptical hole: 10-25mm Small hole: 6-25mm Number of cable entry ports: 2+4 Maximum capacity of fusion fiber tray (core:) 24 Maximum number of fusion cores (cores): 144 Fiber optic residual fiber intake device: Yes Sealing method: mechanical + heat shrink seal Fiber into the end type and number: -- Product use environment: overhead, pipeline, buried 上一个产品 下一个产品

产品详情 全部 通信 终端和服务器 通信 GJS03-M8AX-JX-24~144(GP322) 帽式光缆接头盒, M8 该产品适用于室外光缆架空、管道等直通接续和分歧接续。 本产品具有高强度机械性能、高密封性能、耐腐蚀性强、耐候性优异等特点，免热缩式机械重复开启，可维护性高；结构布局合理，施工操作简单快捷。 应用场景 室外架空、管道、直埋等普通光缆接头接续，可用于城区或城乡普通光纤网络接续保护。 结构图 性能特点： 1、壳体采用优质工程塑料注塑工艺生产、添加有抗紫外线、耐老化助剂，机械强度高； 2、盒体采用单端进出光缆设计结构、便于架空挂杆等安装且筒体可快速开启进行检修和维护；开启盒体无须工具； 3、壳体与底部采用硅橡胶密封圈、光缆口利用耐温热缩管密封，气密性良好； 4、盒体具备电气断开或连通功能，可选配气嘴； 5、大容量接续，满足干线或特种光缆接续保护； 7、防白蚁、耐酸碱油、抗极寒和高温环境需订货单独说明。 技术参数 1、适应环境温度：-20℃~+65℃。 2、大气压力：70~106Kpa。 3、轴向拉力：〉8000N/1min以上。 4、压扁：盒内充入40±5kpa气压，应能承受2000N/100mm横向均布压力，加力时间不小于1ｍｉｎ，试验后接头盒不漏气、无变形、无损伤。 5、冲击：光缆接头盒应能承受落高1m、钢球质量1.0Kg，冲击次数为3次的冲击。 6、弯曲：光缆接头盒与光缆接合处应能承受弯曲张力负荷为150N、弯曲角度±45°的10个循环的弯曲。 7、扭转：光缆接头盒应能承受扭矩不小于50N·m，扭转角度±90°，共10次循环的扭转。 8、跌落：光缆接头盒应能承受2m高度3次的跌落，试验后接头盒不漏气、无变形、无损伤。 9、抗拉力：〉1000N/10cm2压力，时间1min。 10、震动：接头盒承受振动频率为10Hz、振幅为±3mm、振动次数为106的振动，其光纤附加损耗变化值不超过0.2dB; 11、温度循环：-20℃~+65℃，内部气压40(+5)Kpa,循环次数10次， 常温后气压下降不超过5kpa。 12、光纤曲率半径>30mm,光纤熔接盘附加衰耗≤0.01dB。 施工常用工具 十字改刀、热风机或喷枪、锯工、卷尺。 参数表 型号：GJS03-M8AX-JX-24~144(GP322) 盒体材质：PP 适应光缆直径椭圆孔：10-25mm；小孔：6-20mm 入缆口数：2+4 熔纤盘最大容量(芯）：24 最大熔接芯数(芯）：144 光纤余纤收容装置：是 密封方式：机械 光纤成端类型及数量：--- 产品使用环境：架空、管道、地埋 点击下载产品手册 相关产品 1/5 GJS03-M8AX-12~144C（GP313） 帽式光缆接头盒, M8

Product Details All Telecommunication Terminal and Server Electric 上一个产品 下一个产品 MODF rack Fiber optic wiring series products are suitable for central office, optical cross node, user fiber optic access network project in each optical access point, to complete the introduction of optical cable, fixed, open stripping protection, fiber fusion and protection, pigtail storage and management, optical fiber fixed connection and cross-connected functions, according to the function can be divided into line side fiber optic distribution frame, equipment side fiber optic distribution frame and fiber optic total distribution frame. Fiber optic bus distribution frame integrates line side and equipment side ODF function, with high density and flexible wiring characteristics, improve the effective management and protection of optical fiber, to meet the centralized management requirements of a large number of outgoing optical cables in transmission and access rooms. Centralized maintenance of the network saves maintenance costs and improves the standard level of maintenance and maintenance quality. Fiber optic distribution frame is the line side to connect outdoor fiber optic cable, equipment side to connect the optical line terminal or transmission equipment, can dispatch the fiber core serial number in the fiber optic cable and change the optical transmission system road sequence through the patch fiber, and has the fiber optic cable fixed and protection device and test port. Fiber optic main distribution frame is divided into open and closed two structures. Product Benefits (1) Invoking the MDF main distribution frame management model: front line side, back equipment side, continuing existing maintenance staff habits; (2) 72-core fusion wiring unit box design on the line side and 96-core adapter rotary panel wiring unit box design on the equipment side for easy operation; (3) "Foolproof" routing: layer-by-layer import and layer-by-layer diversion on the same side for easy operation, maintenance and management; (4) The rack has independent multi-layer fiber optic channels, reducing the pressure on the server room channels and facilitating scheduling management; (5) Customizable patch fiber lengths to reduce fiber patch redundancy and tangles; (6) (a) The cable is managed in a partitioned manner within the rack, allowing for three-dimensional cross-free patch fiber routing; (7) Equipped with fiber optic cable storage device, which can store the remaining length of fiber optic cable, the left side into the end of the fiber optic cable, the right side storage jumpers. Product Type Open MODF rack The structure of MODF rack adopts double-sided rack structure, horizontal and vertical racks are composed of several fusion and distribution integrated unit frames and fiber-hopping frames, and horizontal channels can be appropriately distributed in the middle of horizontal units. The inline rack is composed of 72-core unit frame plus 12-core fusion and distribution integrated tray, and the horizontal rack is composed of 96-core patch fiber frame. the inline side of MODF rack is also called line side, which is used for centralized fusion and termination of external fiber cables, and the horizontal side is also called equipment side, which is used for distribution and dispatching of internal fiber. Enclosed MODF rack Closed MODF rack structure and open structure is the same, but in the rack body installed with front and rear doors and side panels, the same horizontal and inline racks are composed of a number of fusion and distribution of integrated unit frame and fiber-hopping frame, in the middle of the horizontal unit can be properly distributed horizontal channel. The inline rack is composed of 72-core unit frame plus 12-core fusion and distribution integrated tray, and the horizontal rack is composed of 96-core fiber-hopping frame. The principle of horizontal and inline side is the same as open MODF. Optical Distribution Frame Configuration Table Product use Fiber optic cable fusion, termination, connection, dispatch and storage. (1) The line side can be used for terminating and distributing fiber optic cables at the local end of the trunk in fiber optic communication systems. (2) The line side allows for easy connection, distribution, scheduling and storage of fiber optic lines. (3) Equipment side is to complete the connection, scheduling and commissioning of different optical communication equipment in the communication room. (4) It is a kind of fiber optic patch panel that can complete the storage function of the spare length of patch cords at the line side and equipment side at the same time. Product application tools Fiber melting machine, optical fiber cutting knife, OTDR tester, pen red light source, stripping pliers, power meter, anhydrous ethanol,, fiber cutting knife, oblique pliers, level, impact drill, screwdriver, optical power meter. Frequently Asked Questions How can I determine whether to choose closed or open MODF racks on site? The whole row of racks need to be connected with horizontal fiber using open MODF rack, do not need to be connected with horizontal fiber can choose closed MODF rack. What is the basis for choosing the size of the product? In selecting the size of the product in general several considerations; 1. is based on the installation location of the room around the specifications of other cabinets, choose the same or similar specifications so as to ensure visual unity; 2. according to the size of the installation location to determine the rack specifications; 3. according to the number of cores needed to choose. The above points need to be considered at the same time. How to choose the product adapter type-FC or SC? The choice is based on the type of adapter used with the other equipment used in the server room. How can I tell if a rack is using ribbon or bundled fiber? According to the fiber optic cable used to choose, ribbon fiber optic cable then choose ribbon pigtail, bundle fiber optic cable choose bundle pigtail. How do I choose the color of the rack? The color of the rack is uniform and beautiful according to the color of other equipment inside the server room. 上一个产品 下一个产品

产品详情 全部 通信 终端和服务器 Telecommunication RSBJ 500 Series Non-pressuriezd telephone cable joints splice closure Thermal casing Heat shrinkable sleeve provides electrical insulation, mechanical protection, environmental sealing and strain relief. Our heat shrinkable sleeve is available in single wall and double wall tubing designed for a variety of applications including back-end connector sealing, branching, and connector-to-cable transitions. Our heat shrinkable sleeve can be used with confidence as an alternative to taping, molding or gluing. When heated, our heat shrinkable sleeve will conform to the bottom dimensions of the substrate. Application Scenarios Sleeving for communication cable joint protection, can be used in overhead, pipeline, direct burial and other scenarios. Performance Features 1. Widely used in overhead, direct buried communication cable splicing, in -30 ℃ to +80 ℃ environment can work for a long time. 2. Color with aluminum composite super strong fiber structure, secondary sealing, so that high mechanical strength, tear resistance, heat shrinkage ratio, excellent weather resistance. 3. The inner sealing adopts high quality imported hot melt adhesive formula with superb bonding ability, and the heat shrinkable sleeve has excellent leak-proof, moisture-proof and pressure-bearing ability. Gum softening point can reach 85℃ high temperature, can adapt to areas with high ambient temperature. 4. The white line on the inside of the rail and the thermal paint on the outside surface of the product can guide the correct construction to make it just right. 5. Paper liner, easy and fast operation. Parameters table Commonly used tools for construction Artwork knife, tape measure, flame gun, etc. 点击下载产品手册 相关产品 1/2 RSBJ 550 Series Non-pressuriezd telephone cable joints splice closure Thermal casing 1/2 RSBA 1000 Series Pressurized telephone cable joints splice closure Thermal casing