The Cel-Fi Quatra is an enterprise 4G repeater system designed to provide in-building coverage to large facilities and small-medium sized multi-storey buildings.

Quatra is a hybrid repeater design which follows a hub-and-spoke design. The system breaks apart the functionality of an inline amplifier by separating downlink and uplink boost functions between the hub, called the Network Unit (NU), and spokes, called Coverage Units (CU). Specification listed on this page are for the Network Unit only.

The system requires one Network Unit and between one and four Coverage Units which are interconnected by ordinary Ethernet cables. A typical system design would use one CU per floor on a multi-storey building, or one CU per warehouse in an industrial facility. Each CU is powered via PoE from the NU.

Ethernet cables are used to transmit a digital signal between NU and CU, allowing lossless connectivity up to 100 metres and up to 200 metres with a compatible range extender. This unique implementation allows Quatra to solve ordinarily complex 4G coverage problems with ease.

The Quatra repeater can relay up to four bands simultaneously, with several bands supporting 2x2 MIMO for high speed data applications.

Quatra must be carefully designed and configured in order to correctly function. As a hybrid DAS unit, mobile network operators require Powertec to conduct extensive RF design, which must be submitted to the operator in order to obtain approval for use.

Q34 (Q1000) has been made End-of-Life by the manufacturer.

RF Specification

Simultaneous Bands
Supported Technologies
Relay Bandwidth
75 MHz
Supported Bands
Frequency Band Duplex Method MIMO Uplink Output Power Max. Channel Width Uplink Start Frequency Uplink Stop Frequency
20 MHz
20 MHz
20 MHz
15 MHz
RF Connections
RF Connector Function Quantity RF Interface Notes
Donor Input
Network Interfaces
Ethernet Interfaces
Interface Quantity Function Signalling PoE Output
LAN Management Port
LAN Management Output Port
Link to Coverage Unit (Proprietary Signalling)

Physical Specification

Ingress Protection
Wall / Vertical Surface
250 × 188 × 55 mm
Min. Operating Temperature
0 °C
Max. Operating Temperature
40 °C
1.2 kg
Device Power Specifications
Max. Consumption
120 W
Power Options
DC Power Input
Power Interface
Power Connector Nominal Voltage Min. Input Voltage Max. Input Voltage Voltage Type Input Current
DC Coaxial, Type A, Female 5.5 x 2.5 mm
54 V
51.3 V
56.7 V
2.22 A

Nextivity, Inc. develops and sells in-building cellular coverage technology products and solutions. The Company helps wireless subscribers and increases radio frequency network capacity for mobile network operators. Nextivity operates in the State of California.

Nextivity is best known for its Cel-Fi range of mobile repeater solutions which provide low cost improved in-building coverage solutions.