Elink Development Company — development of integrated hardware and software.
Custom-tailored communication solutions from Germany.
EDC HOFFMEISTER GmbH (Elink Development Company) is a specialized development company focused on modern, network-based communication technology. Our expertise covers hardware and firmware as well as supporting software in the fields of telecommunications, intercom, control, networks, and data security.
We develop embedded systems for voice communication, control, sensor technology, audio, data encryption, and video. The transmission media we use include Ethernet, fiber optics, WLAN, ISDN, telephony, cellular, digital radio, and many other technologies.
Our company has existed since 1981 — consistently staffed with the same technical leadership team throughout. What began as the development of innovative musical instruments quickly evolved into a specialization in electronic data communication and grew into one of Germany's most experienced embedded development teams. This continuity of personnel guarantees deep expertise built up over decades, which goes into every new development.
Development of analog and digital sequencers and synthesizers.
Transition to electronic data communication: interface converters, modems ranging from V.23 to V.34.
First ISDN terminal adapters, the world's first controllable a/b converter, the first true ISDN modem.
With an integrated serial interface, two independent a/b converters, and full PBX functionality.
Start of development of the patented ellan:System — serverless IP telephony without a central instance.
Spin-off of the development team, focusing on neural communication technology. Later renamed to EDC HOFFMEISTER GmbH.
Entry into emergency call communication and public address systems using neural technology.
Industrial door communication over ISDN UP0 with a 4 km range. ZIM-funded project.
Ongoing developments for emergency call, tunnel communication, industrial communication, IoT, encryption, and the Indian market.
Our strength lies in the combination of decades of experience, proprietary technology, and the ability to realize complex systems from concept to series production.
Embedded systems on ARM Cortex (M3/M4/M7 & A-Series), PIC, AVR, Xtensa, TMS-DSP, and eZ80. Design-to-cost optimization, miniaturization, extended temperature ranges. From the circuit through layout to production preparation.
Our proprietary real-time operating system ellan:RTOS — preemptive, modular, highly secure. 99.9% ANSI C, no third-party libraries. TCP/IP stack incl. ICMP, UDP, RTP; VoIP: SIP, H.323 (v4), IAX2, and gateway functions; ISDN: DSS1 (S0/UP0/UK0/S2M); PPP incl. MLPPP, PPPoE, IPCP; routing with NAPT and DNS proxy; HTTP(S) server, FTP/TFTP, SNMP, SMTP/POP3; BSI-compliant encryption (AES, Twofish, Serpent); DSP signal processing, USB (Host/OTG/Device), FAT32 file system.
Patented serverless network architecture: end devices communicate directly with one another — no server, no central instance. Maximum reliability through redundancy. For voice systems, control systems, and IoT.
Full-duplex hands-free communication, echo cancellation, DSP filtering, 100 V public address, VoIP gateways, emergency call stations. Door and industrial communication as well as public address systems.
Ethernet (10/100 Mbit, PoE, VLAN), Single-Pair Ethernet (1,500 m), ISDN UP0 (4 km range), WLAN, LTE/5G, satellite, fiber optics, CAN. Integrated routers with NAPT, DNS proxy, and firewall.
BSI-compliant encryption, hardware-based access controls, proprietary undocumented algorithms on request. HTTPS on embedded devices, AntiSpyFon — a tap-proof telephone.
The heart of our developments — continuously refined for over 20 years. The foundation for thousands of communication systems worldwide.
✅ Fully written in ANSI C — no third-party code
✅ Preemptive multitasking with prioritization
✅ Extremely short boot times (< 100 ms)
✅ Energy-optimized for battery/solar operation
✅ BSI-compliant security architecture
✅ Modular design — use only what you need
🔧 TCP/IP stack with socket interface
🔧 UDP/RTP for real-time audio/video
🔧 VoIP: SIP, H.323, IAX2 (gateway function)
🔧 Encryption: AES, Twofish, Serpent, and more
🔧 HTTP(S) server, FTP/TFTP, email (SMTP/POP3)
🔧 FAT32 file system for flash storage
The operating system is not public and is available in full as source code. This results in security and flexibility advantages that cannot be achieved with open systems such as Linux. It runs on the smallest processor platforms and enables extremely energy-efficient, secure solutions.
From the first idea through the feasibility study to series production — we guide your project through every phase.
We work according to three flexible models, which can also be combined:
One-time development according to your specifications. All rights transfer to you. Ideal for standalone products with a clear requirement profile.
Joint product development in which you market the product. We share in the margin and continue to maintain the product. Including support and training.
Use of our modules (ellan:RTOS, VoIP protocols, ISDN, encryption, and more) for license fees. A package individually tailored to your needs.
Our technology is used in demanding environments worldwide.
Cellular-based emergency call stations in public places. Low-power version for solar-powered operation, WLAN, backup battery, DALI lighting control, and satellite communication.
Gateway for door communication over existing two-wire lines. ISDN UP0 with a 4 km range. ZIM-funded project. Target market: industry and rail in India.
Analog intercom stations in the glacier tunnel. Operation without an external power supply. Valuable expertise for extreme environmental conditions.
Modular communication system for power plant sites: amplifiers, I/O, line adapters, and intercom consoles on an IP basis.
A completely tap-proof telephone with a proprietary, undocumented encryption method. Target audience: lawyers, banks, and government agencies.
IP-based train station intercom stations, deployed by Wiener Linien and worldwide. H.323 compatibility. Replacement for legacy NES92 technology in Asia.
Door communication, factory public address, emergency call, machine control, sensor technology, access control.
Train station intercom stations, tunnel emergency call, announcement systems, communication in shielded environments.
Police, correctional facilities, schools — encrypted communication systems with BSI conformity.
Intelligent control (lighting, climate, presence), hotel control, remote meter reading.
Emergency call stations, defibrillator monitoring, solar/battery-powered systems.
100 V public address, IP amplifiers, conference systems, background music distribution.
Encryption telephones, BSI-compliant data transmission, hardware-based access protection mechanisms.
India (rail & industry), Switzerland (Jungfraubahn, SBB), Austria (Danube power plants), Dubai, Luxembourg.
We draw on an extensive pool of proven modules and combine them into your individual solution.
ARM Cortex (M3/M4/M7 & A-Series), PIC, AVR, Xtensa, TMS-DSP, eZ80 — we select the optimal platform for your application.
Ethernet (with integrated switch), PoE (bidirectional), WLAN, ISDN (S0/UP0/UK0/S2M), analog telephony, cellular, GPS, Bluetooth, USB (Host/OTG/Device), CAN, serial interfaces.
Full-duplex hands-free communication, echo cancellation, DSP compression, 100 V amplifiers up to 40 W, PoE audio, DALI lighting control.
AES, Twofish, Serpent — BSI-compliant algorithms. HTTPS on embedded devices. Proprietary, undocumented methods on request.
Web server (HTTP/HTTPS) on every device, TFTP/FTP, SNMP, email (SMTP/POP3). No PC required for operation.
PoE, integrated 230 V, battery/solar operation. Lowest energy consumption thanks to the optimized RTOS.
BSI Conformity & Certification: Our systems are fundamentally certifiable (CE, EMC, ESD, BSI). We support the approval process or operate it on the customer's behalf. Thanks to our virus-proof real-time operating system, we meet the high security requirements of the BSI — a decisive advantage over typical PC operating systems.
We develop your individual solution — from concept to series production.
Dingeringhauser Weg 8 · 58840 Plettenberg · Germany
+49 (2391) 60 90000 · info@elink.de · www.elink.de
VAT ID DE270934812