Core Credentials
Professional Communication Equipment
Our core product lines cover SDH/MSTP optical transmission equipment, PCM multiplexers and protocol converters, industrial Ethernet switches and fiber media converters, plus converged dispatch and emergency command terminals. All platforms support mixed access of E1, Ethernet, serial and audio services, with flexible configuration from 2M to 10G line rates and both rack-mount and DIN-rail form factors for deployment in telecom, power, rail and industrial environments.
PCMIDM DXC5200 Integrated Service Cross-Connect Multiplexing Equipment
IDM DXC5200 Integrated Service Cross-Connect Multiplexing Equipment supports E1 time-slot cross-connect and non-blocking cross-connection, provides PCM30/32 frame structure and channel-associated signaling, and supports multiple interfaces and service multiplexing.
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PCMIDM MAP4E1-30 Integrated Service Cross-Connect Multiplexing Equipment
The IDM MAP4E1-30 Integrated Service Cross-Connect Multiplexing Equipment is an integrated service platform that combines 64K narrowband service access, PCM multiplexing, and 64K time-slot cross-connection. The IDM MAP4E1-30 is mainly used for service access and cross-connection at the access layer of data communication networks. It provides complete synchronous timing functions and offers non-blocking cross-connection at 64K granularity across 4 E1 channels, while also providing 30 × 64K services, including telephone, magneto telephone, common battery telephone, and V.24 data services.
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PCMMINI 155M PCM Multiplexer
IDM MINI PCM multiplexer, applied in the product showcase field, a communication/transmission/dispatch device for industry customers (subject to the manufacturer's technical documentation for detailed completion)
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PCMPCM Equipment IDM MSAP-G3CP SDH High-Capacity Integrated Service Cross-Connect Multiplexing Equipment
The IDM MSAP-G3CP SDH High-Capacity Integrated Service Cross-Connect Multiplexing Equipment is an integrated service platform that combines narrowband service access, broadband service access, PCM multiplexing, 64K time-slot cross-connection, E1 cross-connection, STM-1/STM-4 cross-connection, SDH/PDH optical transmission, telephone switching digital signaling access, Ethernet switching, and multimedia dispatching. It is an integrated service platform that integrates communication access, transmission, switching, switching, dispatching, and video display control.
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SDHIDM 10G SDH Intelligent Multi-Service Optical Transmission Equipment
The SDH intelligent multi-service optical transmission equipment provides flexible equipment configurations compatible with STM-64/16/4/1; supports online upgrade of the equipment from 155M to 10G. High-capacity cross-connect capability: 200×200 VC4, 600×600 VC3, 12600×12600 VC12 and 22400
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SDHIDM MSAP8000 Integrated Service Transmission Equipment
The IDM MSAP8000 Integrated Service Transmission Equipment is an STM-16/STM-64 multi-service transmission equipment that integrates ADM, DXC, Ethernet switch, and PCM functions, providing high-capacity, long-distance service transmission. It can be used for the formation and capacity expansion of various transmission backbones as well as high-capacity metropolitan service scheduling, meeting bandwidth requirements of different fields and levels. It is an ideal device for building a broadband transport network.
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SDHIDM MSTP155 -16 SDH Multi-Service Access Platform
155M optical interface, 19-inch 1U standard chassis, provides 2×STM-1 interfaces, 4×FE interfaces, up to 16×E1 local termination, 3 universal slots supporting 3 service slots, can be inserted with E1 service cards, FXS/FXO cards, V.24/V.35 cards, Ethernet expansion cards, video cards, universal service cards, flexibly configured according to requirements; equipped with a TelecomBUS expansion bus, can be expanded with a gigabit Ethernet interface card, or 4 groups of physically isolated EOS Ethernet.
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SDHIDM MSTP8200 Integrated Service Transmission Equipment
An integrated service transmission equipment with a 19-inch standard 3U chassis and card-based design, providing 15 3U user card slots and supporting STM-16/STM-4/STM-1 optical interfaces, SDH ring/chain networks, full cross-connect of TDM services, and access to various voice and data services.
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电话光端机IDM 120N-GP Telephone Optical Multiplexer
The IDM 120N-GP telephone optical multiplexer is used in the product showcase field and is a communication/transmission/dispatching device for industry customers (to be detailed and refined based on documentation)
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电话光端机IDM-360ME Telephone Optical Multiplexer
The IDM-360ME telephone optical multiplexer provides 4 shared line-rate 100M Ethernet interfaces (which can also be partitioned for VLAN isolation) and 4 groups of E1 transparent transmission interfaces, along with FXO and FXS interfaces featuring caller ID (CID), and supports a full configuration of 360 user voice channels. It offers 15 card slots, with 1+1 mutual backup for the CMU main control card and 1+1 mutual backup for the power supply, plus 12 service cards, and all card slots support hot-swappable operation. It multiplexes narrowband and broadband services into a 155M optical transmission channel. With a card-based structural design, each service card provides 30 telephone lines, making the equipment simple to install and easy to maintain.
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电话光端机IDM GTD442 Dual-Gigabit Telephone Optical Multiplexer
The optical interface rate of the IDM GTD442 multi-service optical multiplexer is 2.5G, and it can provide 2 wire-speed 1000M Ethernet channels, each of which has 1 electrical port GE and 1 optical port GX; it can also provide a transmission channel with 18 E1 bandwidth. On the line transmission interface, the IDM GTD442 multi-service optical multiplexer provides up to two groups of optical fiber interfaces, forming mutual backup optical ports, or chain networks, ring networks, etc.
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电话光端机IDM OMP2400-30E Multi-Service Optical Multiplexer
Provides 2 2.5G optical ports, 30 telephone service interfaces (FXO, FXS, or magneto selectable), 4 groups of physically isolated line-rate 100M Ethernet (400M in total), two groups of physically isolated line-rate 1000M Ethernet (2000M in total), E1 (1-4 E1 channels in total), HDMI high-definition video transmission, and other user interfaces.
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PDHAirport Communication and Navigation Dual-Network Mutual Backup Switching Device
Airport Communication and Navigation Dual-Network Mutual Backup System Switching Device. In some important remote dispatch and control sites (such as metro, airports, and military), very high system reliability is often required, and services are frequently transmitted over two or more networks, with subscriber terminals able to automatically select a normal transmission network and channel.
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PDHIDM-240NET Optical Multiplexer
The IDM-240NET optical multiplexer is a point-to-point optical transmission device developed with large-scale integrated circuits. In a single-board form, it implements mixed multiplexing of up to 8 E1 services, optical transmission of 4 shared 100M wire-speed Ethernet data channels, and 1 RS232 interface, and supports dual optical port mutual backup and serial port network management.
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PDHIDM OMP3500 Integrated Access Platform
Provides 4 SFP 2.5G optical transmission interfaces, 2 groups of physically isolated wire-speed gigabit Ethernet and 4 groups of wire-speed physically isolated 100M Ethernet; provides up to 16 groups of E1 transparent transmission; provides up to 30 channels of narrowband PCM service access capacity; supports SNMP Ethernet network management; supports FXS/FXO and magneto cards, with 10 or 8 service interfaces per card; 2/4-wire E&M interface cards, with 4 interfaces per card; RS232/RS422/RS485 with 8 interfaces per card; GSM/CDMA services with 2 channels per card; USER universal interface card, which can be mixed with 4 PCM service modules
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PDHIDM OMP3500E Multi-Service Optical Multiplexer
IDM OMP3500E multi-service optical multiplexer, applied in the product showcase field, a communication/transmission/dispatching device for industry customers (to be further detailed subject to the manufacturer's technical documentation)
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IP接入网关IDM IAD-32S Private Network Dispatching Voice Gateway
The IDM IAD-32S is a voice gateway device / integrated access device that supports multiple call control protocols such as SIP, MGCP, and IMS, and provides functions including voice encoding and decoding, fax, QoS, security, reliability, and remote management.
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IP接入网关IDM MEETING1000R Conference Management Device
The IDM MEETING1000R IP conference management device manages conferences over an IP network and provides 16 IP directions of full-duplex conference rooms, with each IP direction supporting up to 4 channels of audio access. By cascading two units, it can provide 32 IP directions of full-duplex IP audio conferencing.
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IP接入网关IDM-RG2000 SIP Radio Trunking Gateway
The IDM-RG2000 SIP radio trunking gateway is used in the product showcase domain and is intended for industry customers' communication/transmission/dispatch equipment (details to be refined based on documentation).
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IP接入网关IDM RG5200 Converged Dispatching Integrated Gateway
The IDM RG5200 converged dispatching integrated gateway is used in the field of converged dispatching gateways, and is communication/transmission/dispatch equipment for industry customers (to be detailed according to the documentation)
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IP接入终端IDM MCC500 Desktop Converged Communication Terminal
The IDM MCC500 desktop converged communication terminal uses a 7-inch touch all-in-one with the fully domestic RK3568 chip and a 2G+16G configuration, delivering not only low power consumption but also strong performance. It is fully capable of meeting audio and video dispatching requirements. The converged communication terminal uses a capacitive multi-touch all-in-one with a 1280*800 dot-matrix display screen and an HDMI output for connecting to an external large display, projector, and more. It connects to Ethernet via WiFi or RJ45. The converged communication terminal can run IDM audio and video telephone terminal software and supports the call functions of a SIP softswitch telephone. The main unit comes standard with
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IP接入终端IDM MCC520 Intelligent Audio and Video Terminal
The MCC520 intelligent audio and video terminal is a device that integrates telephony, IoT management, and video calls. It features a bread-slice form factor that is easy to install on a wall or desktop, supports PSTN and IP telephone functions, and is equipped with a high-performance CPU (RK2568J) supporting Linux and Android systems, allowing users to install third-party applications such as WeChat and Douyin. The device provides USB and HDMI interfaces, supports 4K video output, and offers wireless connectivity including WIFI and Bluetooth, making it suitable for managing IoT devices. The MCC520 also features speech recognition, environmental control, video intercom, and voice wake-up
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IP接入终端IDM MCC580 Portable IP Converged Communication Terminal
The portable IP converged communication terminal integrates converged communication plus edge AI multi-functions, a low-power, high-reliability flagship portable IP communication device. Dual 4MP dual cameras + 10-inch large screen + 1TOPS local AI computing power + 20000mAh lithium battery make mobile command smarter and more efficient. Dual-network dual-gateway, 4G/5G + SparkLink standard, satellite IoT optional, communication continues even without network, command never interrupted. Fully modular expansion slots, pluggable switch/telephone/intercom/radio modules, one device with all interfaces for flexible expansion. AI + converged communication dual empowerment.
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IP接入终端IDM MCC600 Smart Telephone Terminal
The IDM MCC600 smart telephone terminal is an intelligent touchscreen communication terminal that combines a large-size touchscreen with a traditional telephone handset, integrating the call functions of a traditional telephone with multiple functions of modern smart devices. It features a 15.6-inch large touchscreen, allowing users to perform various operations via the touchscreen. Equipped with a traditional telephone handset, it enables users to make telephone calls comfortably.
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音视频调度IDM MCC6000 Portable Converged Communication Command Platform
The IDM MCC6000 portable converged communication command platform is a communication command platform built around integration, compact design, and portability, equipped with three 15.6-inch fold-out monitoring screens and supporting rapid deployment and mobile use. The platform integrates multiple communication network modes (optical fiber transmission, Ethernet transmission, on-site wireless ad-hoc networks (LTE, MESH, trunking), satellite communication, 4G/5G public and private networks, etc.), and can connect on site to various communication terminals such as trunking intercom, mobile man-pack devices, deployable surveillance cameras, UAV video, and video consultation, providing on-site communication networks, command and dispatch, and front-and-rear coordinated handling capabilities
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音视频调度IDM MCC6000A Dual-Host Dual-System Server
In some small converged communication systems, the system needs to support both Linux and Windows environments to meet application and service deployment requirements, and only medium computing performance is required. If a high-performance server is purchased, a virtual machine environment must be installed to implement a dual-system environment, which reduces server utilization efficiency; moreover, such servers are often large in size and unsuitable for portable field use. Therefore, a compact dual-system server that can accommodate two computer main boards is required.
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音视频调度Multimedia Dispatch Terminal
All terminals are either E1-based subscriber terminals or IP-based SIP softswitch terminals. E1-based terminals have dedicated transmission resources and stable performance, but their scalability is inflexible; IP-based devices are compatible with multiple bandwidths and can access a variety of new media services.
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音视频调度Multimedia Touchscreen Dispatch Console
The multimedia touchscreen dispatch console consists of an industrial-grade fully visible, digital high-definition LCD touchscreen and two dispatching exchanges; it has built-in multimedia communication command and dispatch control software, registers and connects to the integrated multimedia communication dispatch host through the IP network, and performs overall command and dispatch control over the communication system. It is the core management and control device of the communication dispatch system; the multimedia communication command and dispatch control management interface displays terminal device types (IP telephones, intercoms, mobile phones, cameras, etc.) in real time in a graphical manner, and displays the current status of devices (idle, ringing, in call, etc.) in real time with corresponding colors; the system implements
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应急通信IDM JQ380 Trunking Intercom Companion
The Trunking Intercom Companion is an intelligent communication device designed for extreme environments. It connects quickly to a phone via magnetic USB and, in areas without network coverage, still delivers stable and reliable intercom communication over a 400MHz PDT trunking system. It not only supports the private call and group call functions of traditional intercoms, but also works closely with a smartphone to enable visualized member positioning, status management and encrypted short message transmission, while retaining professional trunking intercom capability for standalone use without a phone. It perfectly addresses critical communications needs when the public network is interrupted in scenarios such as outdoor operations, emergency rescue and industrial dispatching, making it a professional user's answer to
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应急通信IDM MTP-622 Field Intelligent Multi-Service Optical Transmission Equipment
The Field Intelligent Multi-Service Optical Transmission Equipment adopts a modular functional design, including an SDH optical transmission unit, an E1 link interface control unit, an EOS unit, a PCM unit, an SNMP unit, and a protection switching unit. It features a shockproof, waterproof, and electromagnetic compatibility chassis design, and the service interfaces it provides are suitable for military field use. In addition to the standard configuration of 4-channel 10/100M Ethernet, 16-channel E1, 16 channels of 2-wire and 4 channels of 4-wire voice, 1 V.35 interface, 2 V.24 interfaces, 1 E1 link, and 1 V.35 channel, the equipment also has 4 expansion slots for inserting various service boards.
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应急通信Field Dual-Channel Optical Transmission Equipment MTP-622
Field Intelligent Multi-Service Optical Transmission Equipment MTP-622, applied in the product showcase field, communication/transmission/dispatching equipment for industry customers (to be detailed and refined based on documentation)
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应急通信Field Video Command and Dispatch System
The military field video communication system consists of IDM MSTP155-YZ wideband and narrowband integrated optical multiplexers, IDM MSTP155-YZJ wideband and narrowband integrated optical multiplexers, video capture terminals and video surveillance terminals. The IDM MSTP155-YZ wideband and narrowband integrated optical multiplexer is installed in the surveillance center (such as a communications command vehicle), and the IDM MSTP155-YZJ wideband and narrowband integrated optical multiplexer is installed at a remote station (such as a radar vehicle).
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视频光端机1-Channel Video Optical Multiplexer
The one-channel video series optical multiplexer is a compact optical fiber transmission product for video, data and other service signals, developed by our company using advanced all-digital uncompressed video technology and tailored to the security surveillance market. It can transmit up to 1 channel of unidirectional video, 1 channel of data and 1 channel of bidirectional audio over a single optical fiber. The plug-and-play design makes installation simple and easy, with no on-site adjustment required. Its optical module and core circuits use standard components for high stability, and all optical and electrical interfaces comply with international standards, making it suitable for different operating environments.
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视频光端机IDM-VDA2000 2-Channel Video Optical Multiplexer
The 2-channel video series optical multiplexer is a compact multi-service signal optical fiber transmission product tailored by our company for the security surveillance market. It can transmit up to 2 channels of unidirectional video, 2 channels of data, 1 channel of bidirectional audio, and 2 channels of Ethernet over a single optical fiber.
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视频光端机IDM-VDA2000, IDM-VDA2100, IDM-VDA2210 2-Channel Video Optical Multiplexer
The 2-channel video series optical multiplexer is a compact multi-service signal optical fiber transmission product tailored by our company for the security surveillance market. It can transmit up to 2 unidirectional video channels, 2 data channels, 1 bidirectional audio channel, and 2 Ethernet channels over a single optical fiber, meeting user requirements. It adopts the internationally advanced all-digital uncompressed video technology to transmit two video channels and multiple data channels synchronously in real time over the optical fiber with no distortion and high quality, and its high-quality video performance meets user requirements. The plug-and-play design makes installation simple and easy, with no on-site adjustment required. Its optical module and core circuits use standard components, ensuring high stability.
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视频光端机IDM-VDA4200 Series Single-Fiber 4-Video Optical Multiplexer
The 4-channel video optical multiplexer is a compact multi-service signal optical fiber transmission product tailored by our company for the security surveillance market. It can transmit up to 4-channel unidirectional video, 4-channel data, 1-channel bidirectional audio and 2-channel Ethernet over a single optical fiber, meeting various user requirements. Adopting the internationally advanced all-digital uncompressed video technology, it transmits two channels of video and multiple channels of bidirectional data synchronously in real time over the optical fiber with no distortion and high quality. Its high-quality video performance and bidirectional data transmission can meet various user requirements. The plug-and-play design makes installation simple and easy, with no on-site adjustment required. Its optical module and core electrical
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光纤收发器HG8240 Optical Network Terminal HG8240 Optical Network Terminal
HG8240 optical network terminal, applied in the product showcase field, communication/transmission/dispatch equipment for industry customers (to be detailed and refined based on documentation)
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光纤收发器IDM-GE Gigabit Fiber Optic Media Converter
The IDM-GE gigabit fiber optic media converter is an optical-to-electrical signal conversion device used to convert the electrical signals of a computer's gigabit Ethernet into optical signals. It complies with the IEEE 802.3z/AB standard. Its features include electrical port signals that are 10/100/1000Base-T adaptive and can operate in either full-duplex or half-duplex mode, while optical port signals operate only in 1000Base-SX/LX full-duplex mode. It offers good stability and reliability.
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光纤收发器IDM POE-M8 PoE Gigabit Fiber Optic Ethernet Switch
The IDM POE-M8 PoE gigabit fiber optic Ethernet switch features 8 PoE power supply RJ45 ports and 3 1000M SFP fiber module expansion slots, and supports gigabit optical ports to form chain networks and tree networks. All 8 RJ45 ports support IEEE 802.3af/at standard PoE power supply, and can be configured for VLAN isolation or shared gigabit. Per-port power supply is up to 30W, and power supply of the unit is up to 150W. It can automatically detect and identify powered devices compliant with IEEE 802.3af/at standards, and supplies power over network cables via a priority mechanism.
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光纤收发器IDM WR300 5G Private Network Industrial Router
The IDM WR300 5G wireless VPN transmission device is a high-speed 5G terminal based on a 5G NR/LTE-FDD/LTE-TDD/HSPA+ cellular modem. It integrates a dual-core 880MHz CPU and provides 2 10/100/1000M network ports, 1 SIM card slot and a plug-in LAN port to receive high-speed 5G networks. Its compact design and aluminum alloy housing provide excellent heat dissipation. The product has also undergone wide-temperature, wide-voltage input and electromagnetic compatibility (EMC) testing. It has been widely used in M2M applications across the Internet of Things (IoT) industry chain.
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电梯终端IDM DT1000 Elevator Terminal
The IDM DT1000 Elevator Status Acquisition Controller includes the full-function access type and the standard-function access type. It is used for collecting and reporting elevator operating status, remote control management of elevators, and emergency call-for-help alarms inside the elevator car. It can be applied to all aspects of smart elevators.
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电梯终端IDM DTWF-2 Elevator Five-Party Intercom IP Gateway
When there is no optical fiber connection between the central office monitoring room and the elevator machine room, but an IP connection channel is available, a mode similar to VoIP telephony can be used, but without a SIP server; instead, an end-to-end IP hotline connection is used. In this case, the IDM DTWF-2 elevator five-party intercom gateway can be used. If it is not an IP private network, VPN virtual private network technology is required. The IDM DTWF-2 provides conversion of 2-channel elevator intercom interfaces to an IP transmission network.
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电梯终端IDM NT202 (DT) Mitsubishi Elevator Digital Five-Party Intercom Optical Multiplexer
The IDM NT202 (DT) Mitsubishi elevator digital five-party intercom optical multiplexer provides a dedicated digital five-party intercom interface card that can match the signaling of five-party intercom units, enabling five-party communication between the central office and the machine room, car, car top, and pit. Five-party intercom optical multiplexers are available in 2-channel IDM NT202 (DT), 8-channel IDM ENT448 (DT), 30-channel IDM 30EN (DT), and other models. They meet the signal transmission needs from elevator group machine rooms of different capacities to the central office monitoring room, and are also suitable for fiber access transmission during monitoring room relocation and consolidation.
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电梯终端IDM NTD421 Elevator Five-Party Intercom Optical Multiplexer
Because the five-party intercom telephone and the ordinary telephone work on different principles, an ordinary telephone optical multiplexer cannot be used. Raytrans' dedicated five-party intercom interface card matches the signaling of five-party intercom units, enabling five-party communication between the central office and the machine room, car, car top, and pit. Five-party intercom optical multiplexers include the 2-channel IDM NT202(DT), 4-channel IDM NT104(DT), 8-channel IDM ENT448(DT), 30-channel IDM 30EN(DT), and so on. They meet the signal transmission needs from elevator group machine rooms to the central office monitoring room at different capacities, and are also suitable for fiber optic connections during monitoring room relocation or consolidation.
Learn MoreIndustry Scenario Solutions
We provide end-to-end communication solutions for power dispatch and substation networks, rail transit and tunnel corridors, underground and surface mining networks, long-distance oil and gas pipelines, water conservancy and hydrological monitoring, and government emergency command. Each offering covers fiber route planning, multi-service multiplexing and the deployment of dispatch consoles and emergency terminals, delivered across point-to-point, chain and self-healing ring topologies.
All-Domain Emergency Intelligent Terminal and Converged Dispatch Solution
An all-domain emergency intelligent terminal and converged dispatch solution for extreme scenarios…
Solution DetailsCoal Mine Emergency Converged Dispatch Communication System Solution
Coal mine safety production and emergency rescue operations place extremely high demands on the reliability…
Solution DetailsAll-Domain Emergency Intelligent Terminal Converged Dispatch Solution
Designed for complex emergency scenarios, this solution leverages satellite call-response terminals and all-domain…
Solution DetailsReal-World Deployments
Our delivered projects span State Grid and regional power utilities, urban rail transit operators, coal and metal mining companies, oil and gas pipeline enterprises, water conservancy authorities and government emergency agencies. These case studies illustrate how service interfaces, transmission distances, redundancy protection and routine maintenance differ across industries, providing practical references for equipment selection and network design.
A Mine Emergency Converged Dispatch Communication System Construction Plan
Aiming at the current situation where systems such as underground production dispatch telephones (350 units)…
One-Map Provincial Emergency Command: XX Province Full-Region Intelligent Emergency Dispatch System Case Study
Through deep integration of full-region intelligent emergency terminals, satellite paging terminals…
Industry Insights
Stay informed on optical transmission and industrial communication technology trends, the migration from traditional SDH to packet transport networks, updates to emergency communication policies and relevant industry standards, as well as our latest product launches, certifications and project milestones — helping you time your equipment selection and network upgrades.
Communication "Fortress" in Extreme Environments: Building an Uninterrupted Command Hub for Rocket Launches
Every second of a rocket launch leaves no room for communication failure—from status reporting at the launch pad to…
Beijing Ruiguang Jiyuan Secures Beijing Innovative SME Certification
Recently, Beijing Ruiguang Jiyuan Digital Technology Co., Ltd. (hereinafter referred to as "Raytrans") officially passed the…
A Decisive Milestone! Raytrans Joins the "Specialized, Refined, Distinctive, and Innovative" Ranks, with Hardcore Strength Earning Official Recognition
Recently, the Beijing Municipal Bureau of Economy and Information Technology released the list of specialized, refined…
SDH Optical Terminal Video
SDH Optical Terminal Video. Industry news and product updates from Beijing Ruiguang Jiyuan Digital Technology Co., Ltd., covering communication transmission and emergency command dispatch.
Frequently asked questions
Common questions from buyers about optical terminal selection, technical differences and product capability. Full knowledge base has more topics.
What is an Optical Terminal?
Many people are unfamiliar with the optical terminal, but in essence, it is a dedicated device for optical-electrical…
What is the difference between an Optical Terminal and a Media Converter?
Optical Terminal is a device that converts multiple E1 (a data transmission standard for trunk lines…
What indicators should be considered when selecting an optical terminal?
Indicators for Optical Terminal Selection I. Optical Terminal Type: Analog Optical Terminal/Digital Optical Terminal…
What is the difference between single-fiber and dual-fiber?
The biggest difference between single-fiber and dual-fiber optical terminals lies in the optical modules on their…
What is the difference between PDH and SDH?
I. PDH PDH is the Plesiochronous Digital Hierarchy, which is divided into the European standard and the…
What advantages do Raytrans brand telephone optical terminals offer?
Optical transmission interfaces: Supports PDH and SDH interfaces PDH interfaces support 155M, 250M, 2.5G, and 5G rates





