Distribute power, audio, and control data throughout an Aiphone GT Series multi-tenant intercom system with the Aiphone GT-BC Audio Bus Control Unit.

The GT-BC serves as the central audio bus controller in a standard GT Series installation, managing communication between entrance stations, tenant stations, security guard stations, and other compatible system components.

Operating from 24VDC, the GT-BC uses simple 2-conductor non-shielded bus wiring and can be surface mounted or installed on an optional DIN rail for organized equipment-room installation.

Key Features

• Genuine Aiphone GT-BC

• Audio Bus Control Unit for GT Series

• Distributes power and data to compatible GT Series stations

• Controls both audio and data signals

• Supports multi-tenant entrance communication

• 24VDC operation

• Maximum current consumption of 0.9A

• Uses Aiphone #872002 2-conductor cable

• Up to 980 ft to the farthest tenant station per bus line

• Supports entrance stations, tenant stations, and guard stations

• Wall-mount installation

• Optional DIN rail mounting with W-DIN11

• Self-extinguishing ABS housing

• Designed for accessible equipment-room installation

• Used with GT-VBC in standard video systems

Product Specifications

Manufacturer: Aiphone
Model: GT-BC
Series: GT Series
Product Type: Audio Bus Control Unit
Function: Audio / Data / Power Bus Distribution
Power Requirement: 24VDC
Maximum Current Consumption: 0.9A
Recommended Power Supply: PS-2420UL
Wire Type: 2-Conductor, Solid, Non-Shielded, PE Insulated
Recommended Wire: Aiphone #872002 Series
Mounting: Surface Wall Mount or DIN Rail
DIN Rail: W-DIN11
Housing: Self-Extinguishing ABS Plastic
Color: Middle Gray
Operating Temperature: 32°F to 104°F (0°C to 40°C)
Height: 4-1/4"
Width: 4-13/16"
Depth: 2-3/8"
Approximate Weight: 0.99 lb / 450g

GT Series Audio Bus Controller

The GT-BC provides the primary audio and data communication path in a standard Aiphone GT Series installation.

It communicates with compatible equipment including:

• Entrance stations

• Audio tenant stations

• Video tenant stations

• Security guard stations

• Audio entrance modules

• Video system control equipment

The GT-BC allows these components to communicate over the common GT Series audio bus.

Standard System Capacity

In a standard GT Series system, the GT-BC supports up to:

Entrance Stations

Maximum 5

Up to 3 entrance stations per trunk from the distribution point.

Residential / Tenant Stations

Maximum 48

Up to 25 tenant stations per trunk from the distribution point.

Security Guard Stations

Maximum 2

These figures apply to the standard GT-BC system architecture.

Larger GT Series installations use Aiphone's expanded-system components.

Expanded GT Series Systems

For applications exceeding standard GT-BC capacity, Aiphone offers expanded bus-control equipment such as:

GT-BCXB-N – Expanded Bus Control Unit

Expanded GT Series systems can support significantly larger quantities of:

• Entrance stations

• Tenant stations

• Security guard stations

• Buildings

• Access-control functions

Always design expanded systems according to the current Aiphone GT Series engineering documentation.

Audio Bus Wiring

The GT-BC uses:

2-Conductor, Solid, Non-Shielded, PE-Insulated Cable

Recommended Aiphone wire:

• 87200250C – 20 AWG | 500'

• 87200210C – 20 AWG | 1,000'

• 872002P10C – 20 AWG | Plenum | 1,000'

Correct wire type is important for communication quality and maximum system distance.

Maximum Wiring Distance

Aiphone specifies up to:

GT-BC to Farthest Tenant Station: 980 ft

The same GT Series architecture also allows approximately:

GT-BC to Farthest Entrance Station: 980 ft

Actual system distance depends on the complete wiring layout and conductor specifications.

24VDC Power

The GT-BC operates from:

24VDC

Recommended power supply:

PS-2420UL – 24VDC, 2A Power Supply

Maximum GT-BC current consumption:

0.9A

Power-supply quantity depends on the complete GT Series system configuration.

GT-BC & GT-VBC Video Systems

In a standard GT Series video system, the GT-BC handles the audio/data bus while the:

GT-VBC – Video Bus Control Unit

handles video distribution.

Typical video systems therefore use:

• GT-BC – Audio Bus Control

• GT-VBC – Video Bus Control

Aiphone specifies that the GT-BC and GT-VBC share an appropriately configured power supply in standard systems.

Compatible Tenant Stations

The GT-BC supports compatible GT Series tenant stations including:

GT-1A

Audio open-voice tenant station.

GT-1D

Audio handset tenant station.

GT-1C7

7" video tenant station.

GT-1C7W

7" app-compatible video tenant station.

GT-1M3

3.5" video tenant station.

Video tenant stations also require the appropriate GT video-bus equipment.

Compatible Entrance Equipment

The GT-BC works with compatible GT Series entrance equipment including:

• GT-DB – Audio Module

• GT-DB-VN – Audio Module with NFC Reader

• GT-DMB-N – 3-in-1 Video Entrance Station

• Modular GT entrance stations

• Compatible direct-select entrance stations

• Compatible digital directory entrance stations

Security Guard Station

The standard GT-BC architecture supports up to:

2 Compatible Security Guard Stations

Current compatible equipment includes:

GT-MKB-N – Video Security Guard Station with NFC Reader

The guard station allows communication between building personnel, tenants, and entrance stations.

Power & Status Controls

The GT-BC includes:

• Main power switch

• Green power-status LED

• Power terminals

• R1 / R2 audio-data bus terminals

• Removable terminal connections

These controls and connections simplify installation, service, and troubleshooting.

DIN Rail Mounting

The GT-BC can be mounted directly to a suitable wall or panel.

For DIN rail installation, use:

W-DIN11 – 11cm Steel DIN Rail Mounting Bracket

Aiphone recommends installing the bus control unit in an accessible service location with adequate clearance for ventilation and maintenance.

Equipment Cabinet Installation

The GT-BC is commonly installed inside a low-voltage equipment cabinet or electrical room alongside equipment such as:

• PS-2420UL power supply

• GT-VBC video bus controller

• Distribution terminal blocks

• Expanded bus controllers

• Network adaptors

Aiphone recommends maintaining proper spacing around equipment for heat dissipation and service access.

Important Installation Note

The GT-BC should be installed in an accessible service location.

Do not install the unit in inaccessible spaces such as:

• Sealed ceilings

• Inaccessible attics

• Permanently enclosed wall cavities

The controller may require future access for testing, wiring changes, troubleshooting, or system expansion.

Ideal Applications

• Apartment buildings

• Condominium complexes

• Multi-tenant residential properties

• Commercial office buildings

• Mixed-use developments

• Student housing

• Senior-living properties

• Controlled-access buildings

• GT Series audio intercom systems

• GT Series video intercom systems

• Existing GT system expansions

Important Ordering Information

This listing is for the GT-BC Audio Bus Control Unit only.

The following are sold separately unless specifically stated:

• PS-2420UL power supply

• GT-VBC video bus control unit

• W-DIN11 DIN rail

• Entrance stations

• Tenant stations

• Security guard station

• Audio wiring

• Video wiring

• Electric locking hardware

• Distribution terminals

• Other GT Series components

Verify the complete GT Series system design and power requirements before ordering.