Arunachal Pradesh Legislative Assembly.
- Itanagar, Arunachal Pradesh
- Handover 2017
- Public Works Department, Government of Arunachal Pradesh
- 120-delegate legislative chamber with chairman dais, public gallery and operator control room
· The brief
What we were
asked to deliver.
A 120-seat state legislative chamber engineered for sittings, parliamentary voting, 8-channel interpretation and chamber recording — anchored on the Bosch DCN Concentus platform with auto-tracking camera matrix, ambient and architectural lighting on a touch dimmer, and a Plena sound-reinforcement chain. Delivered as a sub-contracting engagement under the Arunachal Pradesh Public Works Department.
· Engagement note
The kind of building
this actually is.
A government brief is rarely a brief about technology. It is a brief about the operating reality the building will inhabit on its busiest day — the rota, the audit, the inspection, the regulator, the family, the night shift. We engineer to that day, not to a brochure. The systems below were designed against the worst-case load and tuned to feel effortless against it for everyday use.
On a project of this type, the discipline is in the seams: where the cause-and-effect from one panel has to read cleanly into another, where the cabling pathway is shared by three trades, where the commissioning calendar needs to clear before the operator’s calendar opens. We hold all of that under one contract — design through commissioning — so that when something is asked of the building three years from now, there is one accountable hand to ask.
The scope below is the measurable output. The unwritten output is a documentation pack the operator can hand to a successor without losing a year of institutional knowledge.
· What we delivered
10 disciplines,
one contract.
A single integrated stack — design, procurement, installation, commissioning and AMC by a single accountable contractor. Each line carries its own drawing pack, cause-and-effect and commissioning sign-off.
- Bosch DCN Concentus digital-conferencing system — chairman + 120 delegate units
- Bosch DCN integrated software — discussion, mic management, voting, interpretation, attendance, video display, camera control, audio expansion, delegate database
- 8-channel infrared interpretation with 121 Bosch Under-Chin headphones
- Bosch Plena sound-reinforcement chain — mixing amplifier, dual boosters, 20 line-array speakers, automatic feedback suppressor, 40 wall-mounted speakers across cabins
- Auto camera-tracking matrix — 4× 360° PTZ cameras, 4-channel 2 TB DVR, joystick controller, 8×2 video matrix
- Four 60-inch LED displays for camera and voting-result projection inside the Assembly Hall
- Hard-disk based session recording for assembly proceedings
- Ambient and architectural lighting — LED downlighters, diffused trays, track lights, dimmable drivers
- Leading/trailing-edge 6-channel touch-control dimmer system, iPad-compatible (Phillips/Crestron-class)
- 1200 metres of FR PVC IS-694:1990 single-core copper wiring on IS-9537 Part-III PVC conduit
· Systems integrated
The named systems,
not the trade-list.
Each system was engineered as a coordinated layer — its own controllers, commissioning report and AMC inclusion — and stitched into the cause-and-effect that runs across all of them.
- 2× Bosch DCN Concentus Chairman Units with priority facility — gooseneck mic, bi-colour ring (red active / green request), voting button, fold-away flat-panel loudspeaker, mic ON/OFF and headphone socket (1 working + 1 spare)
- 120× Bosch DCN Concentus Delegate Units — gooseneck mic, bi-colour ring, voting button, built-in fold-away speaker, mic ON/OFF and headphone socket
- Bosch DCN Central Control Unit — PC-compatible, control-room operation, OPEN / OVERRIDE / Operator modes, 1–4 open microphone selection
- 5× Bosch Extended PSU units for delegate-bus power distribution
- Operator workstation — i7 desktop with 32-inch SXGA monitor, 1 TB HDD, 8 GB RAM and DVD writer, on Bosch DCN client software
- Integrated Bosch DCN software stack — discussion, mic management, synoptic control, electronic voting (parliamentary + opinion), interpretation, operator control, attendance and access control, video display, camera control, internet proceedings follow, private conversation, audio expansion and delegate database
- 121× Bosch Under-Chin Light-Weight Professional headphones for 8-channel interpretation distribution
- Equipment rack — Central Control Unit, professional DAT audio recorder, Bosch Plena mixing and booster amplifiers, monitoring loudspeaker and automatic feedback suppressor
- Bosch Plena sound reinforcement — 1× 120 W Plena Mixing Amplifier, 2× 240 W Plena Booster Amplifiers, 20× 30 W high-quality line-array speakers, 1× Automatic Feedback Suppressor, 40× 6 W wall-mounted speakers (minister cabins / rooms) with local volume control
- Automatic camera-tracking — 4× Bosch 360° PTZ cameras (4–90 mm), microprocessor-based 4-channel DVR with 2 TB recording, joystick keyboard with LCD camera-control surface, 8×2 microprocessor video matrix controller
- 4× 60-inch LED TV displays (Sony / Samsung / LG / Panasonic / Philips class) for camera output and voting-result projection in the Assembly Hall
- Cabling backbone — Bosch DCN digital data and signal trunk, unarmoured speaker cable, CAT6, RG-11 / Co-Axial / HDMI video distribution, PVC channel and conduits, video feed multiplier and patch panels
- Ambient Assembly-Hall lighting — LED, diffused translucent trays, downlighters, tray lights and track lights with dimmable drivers / ballasts, diffused / focus / spot reflectors in recessed powder-coated fittings with safety-wire roof anchoring
- Leading / Trailing-Edge Dimmer System — minimum 6 channels, touch control interface, iPad-compatible (Phillips / Crestron class) for the entire Assembly-Hall ambience lighting
- 1200 m of FR PVC IS-694:1990 1100 V single-core copper wiring (2× 2.5 sq mm + 1.5 sq mm earth) on 20 mm 2 mm-thick heavy ISI-marked IS-9537 Part-III rigid PVC conduit (Finolex / RR Kabel / Nicco / Anchor approved)
· Engineering challenges solved
The hard problems,
not the press release.
Below is what actually had to be engineered through — written by the team that solved each one, not by the team that wrote the brochure.
- 01
Standing up a 120-delegate Bosch DCN Concentus chain on a digital trunk that has to remain quiet enough for chamber-grade voice pickup, while the same trunk carries 8 channels of interpretation, camera-control signalling and the voting bus. The trunk routing was pulled in IS-9537 Part-III rigid PVC conduit segregated from the FR PVC mains, with dedicated returns at the central control rack — not shared with the Plena amplifier returns.
- 02
Specifying the Plena sound-reinforcement profile so the 20 line-array speakers cover the entire Assembly Hall at conversational SPL with the Auto Feedback Suppressor armed throughout, while the 40 wall-mounted speakers in minister cabins and side rooms remain on their own zone with local volume control — one operator preset arms the whole chain.
- 03
Engineering the 4× Bosch 360° PTZ camera-tracking matrix against the chamber's concentric desk geometry — the 8×2 video matrix routes any camera output onto any of the four 60-inch repeater displays, with the joystick keyboard mapping each camera to a memorised delegate seat-set for follow-the-speaker tracking.
- 04
Coordinating the Leading / Trailing-Edge 6-channel dimmer with the architect's mixed Assembly-Hall fixture set — diffused translucent trays, downlighters, tray lights and track lights all on dimmable drivers — so the operator can recall named ambience scenes (Session / Voting / Recess / Recording-Off) from a single iPad-class touch interface.
- 05
Holding 1200 metres of FR PVC single-core wiring on IS-9537 Part-III conduit through a state-government tender's published BOQ inspection sequence — every panel, joint and earth-continuity 1.5 sq mm conductor signed off against the IS-694 fire-retardant compliance schedule before commissioning began.
- 06
Delivering the engagement as a sub-contracting deliverable under the Arunachal Pradesh PWD's tender envelope — installation, commissioning, software configuration, modification, site testing, interconnection and a 2-year warranty-and-operation-assistance period folded into a single accountable scope with documented design and operation manuals at handover.
· Integration summary
How the disciplines
were stitched.
The chamber works as one system because it is wired as one system. The Bosch DCN trunk carries discussion, voting and interpretation on a segregated digital bus; the Plena chain carries the chamber's voice reinforcement with the automatic feedback suppressor armed across the whole hall; the camera matrix routes any of four Bosch 360° PTZ feeds onto any of four 60-inch LED repeaters; and the entire ambient and architectural lighting rig recalls named scenes from a single 6-channel touch dimmer. Each layer is independently serviceable, but every operator gesture coordinates the whole — and the documented handover pack lets the AP PWD's facility team own that coordination after warranty.
· Operational impact
What changed for the
day-two team.
A handover is not a milestone — it is the day the operations team starts running the building without us. These are the changes they inherit.
- Sittings, parliamentary voting, 8-channel interpretation and chamber recording run from one operator workstation — no separate vendor handover for any sub-system.
- Vote tally and camera output route onto four 60-inch LED displays inside the chamber in the same operator gesture — division results visible to every delegate without a separate display console.
- 121 Under-Chin headphones plus 8 active interpretation channels — every delegate gets a personal language feed without manual switching at the operator console.
- One iPad-class touch dimmer recalls Session / Voting / Recess / Recording-Off lighting scenes for the entire Assembly-Hall ambient and architectural rig.
- Two-year operation-assistance period folded into the contract — the AP PWD's facility team owns the deployment after warranty, with documented design, drawing and operation manuals delivered at handover.
· Standards & compliance context
The codes the work
was held to.
Each standard is the framework an inspector or auditor would check our work against. Deliverables sized to satisfy each one in writing, not in conversation.
- IS-694:1990 — PVC insulated copper conductor cables for working voltages up to 1100 V
- IS-9537 Part-III — rigid steel conduits for electrical wiring (rigid PVC conduit cross-reference)
- NBC 2016 — fire and life-safety provisions for assembly occupancy
- Bosch DCN Concentus / Integrus published design and commissioning guides
- AP PWD published BOQ inspection and handover schedule
· Brand stack
Specified for the project,
not the brochure.
Each brand was chosen for the project’s specific requirements; no partnership volume influenced the recommendation. Click any brand to visit the manufacturer’s official site.
· Documentation handed over
What our client received
on day one.
As-built architectural-coordination drawings
Single-line diagrams + panel schedules
Rack and patch labelling schedules
Controller configuration files (offline baseline)
Calibration reports for AV and life-safety
Cause-and-effect matrix (signed by AHJ)
Software-licence registers
AMC enrolment with response SLA
Operations manual in plain English
· Why it mattered
A building is not commissioned on the day the contractor leaves. It is commissioned on the first ordinary morning the operators run it without us in the room.
We design every project with that morning in mind — the panel labelled in the operator’s own language, the documentation legible to a successor we will never meet, the AMC programme already calendared, the spares already in our Lachit Nagar office. A government engagement of this scale is judged not on handover day but in year three. That is the standard the brief was held to.
/ On site
6 frames from the engagement.
Photographs from the working installation. Permitted by the client; published with redactions where the brief required.
· Systems used on this project
Read the systems,
in depth.
Each linked service page goes deeper than this case study — capabilities, integration logic, failure scenarios, FAQs and the codes the work is engineered to.
Digital Conferencing & Voting Systems
Sittings, voting, interpretation — one system, every seat.
Read the serviceAVAuditoriums & Boardrooms
Rooms that begin on time.
Read the serviceELVProfessional Audio & PA Systems
Intelligible, every seat in the house.
Read the serviceELVCCTV & Surveillance
Coverage. Storage. Evidence.
Read the serviceAutomationLighting Automation
Light, tuned to the hour.
Read the service· Explore similar systems
Projects that share
the same disciplines.
· Where this work sits
Itanagar,
in our practice.
Active service area in Itanagar and across Arunachal Pradesh.
Read our Itanagar practice· Reference walkthrough
With the host’s permission,
we’ll arrange a site visit.
Brochures and CGI tours teach you nothing about how a system actually feels. For serious enquiries we facilitate site visits to active deployments — typically within a week of request, subject to the host’s availability.