Replace aging analog intercoms with full HD IP video, remote smartphone access, and cloud management — using the existing 2-wire bus cable already in the wall. No new conduit, no wall breaking, no scaffold. CE · RoHS · EN 50131-1 Grade 2 · KfW 455 eligible.
The Trudian 2-wire retrofit system uses a compact IP adapter module that bridges your existing 2-wire bus to the IP network — no new cabling, no conduit, no wall damage.
Identify wiring type (2-wire bus, 4-wire, CAT3) and total bus run length. Trudian provides a free wiring compatibility checklist.
Replace old door panel. Install IP gateway adapter in entrance cabinet — connects to existing 2-wire bus on one side and PoE switch on the other.
Swap old apartment handsets for new 7" colour touchscreen monitors. 20–40 min per unit. Same wall backbox in most cases — no plastering.
SIP registration, cloud configuration, resident app setup. Full building of 180 units commissioned in 1 day after hardware install.
The existing 2-wire bus carries both power and data to each apartment adapter — no separate power supply needed at each floor. The IP gateway at the entrance does all the conversion, keeping apartment hardware cost low.
The Trudian 2-wire retrofit adapter works with all common intercom cable types found in European, GCC, and Asian apartment buildings — no wiring changes required.
The 2-wire adapter replaces the entire legacy system. The existing cable is reused; the old handsets and control units are removed. Compatible legacy brands include:
For a typical 180-unit apartment building in Germany or the UK — representative figures to illustrate the cost advantage of 2-wire retrofit over full IP rewiring.
* Illustrative figures for a 180-unit German apartment building. Actual costs vary by building layout, local labour rates, and scope. KfW 455 grant may offset €1,600/unit (up to €288,000 for 180 units when eligible).
The KfW 455 "Einbruchschutz" programme provides grants for residential security upgrades in Germany — including video intercom systems that meet EN 50131-1 Grade 2 specification.
Trudian provides the following compliance documents required for the KfW 455 grant application package:
Tell us your building size, existing wiring type, and market. We'll provide an itemized retrofit quote with KfW 455 documentation package. MOQ 200 units. 24-hour response.
Yes. The Trudian 2-wire retrofit adapter reuses existing 2-wire bus, 4-wire analog, or CAT3 cabling with no wall breaking, conduit work, or scaffolding required. The gateway installs in the communications room and converts the existing bus to IP; only the entrance door station and indoor monitors require replacement. Compatible with Aiphone, Siedle, Fermax, Comelit, Urmet, Elvox, BPT, and generic 2-wire bus systems.
Yes, when installed with CE-certified door panels meeting EN 50131-1 Grade 2. KfW 455 grants cover up to 10% of eligible costs (maximum 5,000 EUR per residential unit) for barrier-free access improvements. Applications must be submitted before installation begins through a KfW-accredited energy consultant. Trudian provides all required compliance documentation including CE Declaration of Conformity, product technical datasheet, and German-language user documentation.
Compatible wiring types: 2-wire bus (0.5–1.5mm² cross-section), 4-wire analog intercom cable, CAT3 or telephone cable (4 conductors minimum), and CAT5e/CAT6 (supports PoE direct). Not compatible: single-wire systems, coaxial cable, and fiber optic cable. Bus voltage must be 18–30V DC for gateway compatibility. Measure bus voltage at the communications room before ordering.
3–5 working days with a 2-person installation team. Day 1 covers door panel installation and IP gateway commissioning. Days 2–4 cover apartment indoor monitor replacement at approximately 40–45 units per day (20–30 minutes per unit). Day 5 covers system commissioning and handover. The building remains fully operational throughout with zero tenant displacement required.
Yes. EU cloud storage is available on AWS Frankfurt (eu-central-1) or Azure Netherlands, keeping all data within the EEA. On-premise ONVIF NVR storage is also supported for zero-cloud deployments. Video retention is configurable from 7 to 90 days. GDPR Article 28 Data Processing Agreement is provided to all EU B2B partners. German Auftragsverarbeitungsvertrag (AVV) available on request.
For a typical 50–200 unit residential building in Western Europe, full rewiring costs 150–400 EUR per unit in labour alone. A 2-wire retrofit eliminates all rewiring labour, reducing total project cost by 40–65%. For a 100-unit building in Germany: full rewiring total cost 25,000–60,000 EUR; 2-wire retrofit total cost 8,000–18,000 EUR. Combined with KfW 455 grant funding, the net cost can be reduced by a further 10% of eligible costs.
The system is SIP 2.0 (RFC 3261) compatible and works with any SIP server including Asterisk, FreePBX, 3CX, Cisco Unified Communications, and Avaya. For buildings without existing SIP infrastructure, Trudian provides a cloud SIP server option hosted in EU region. For local resilience without internet dependency, a Raspberry Pi-based Asterisk deployment in the communications room provides full local SIP routing. Configuration guides for Asterisk and 3CX are provided with B2B orders.
