Product Summary

The Lenolink TETRA Fiber Optical Digital Repeater Remote Unit (RU) is designed to provide remote RF coverage in a fiber-fed TETRA distributed coverage system.

The RU operates with the corresponding MU using the same TETRA frequency configuration:

• Uplink / Rx: 450–455 MHz
• Downlink / Tx: 460–465 MHz
• RF bandwidth: 5 MHz

The unit receives RF signals through the optical link from the MU, converts the optical signal into RF, amplifies the signal and provides RF output to the local antenna system.

The RU supports a composite downlink RF output power of 37 ± 2 dBm and a specified RU gain of 45 ± 3 dB.

A manual attenuation range of 0–25 dB provides RF level adjustment during installation and system commissioning.

The RU uses a single-mode optical fiber interface with an LC/UPC connector and provides an optical output power of 0 ± 3 dBm at 1310 nm.

The specified optical receiver sensitivity is ≤ −12 dBm.

The outdoor-ready aluminum-alloy enclosure provides IP65 protection, allowing the RU to be deployed in indoor and outdoor coverage environments.

Typical System Configuration

The RU operates as the remote RF unit of a fiber-fed TETRA coverage system.

Recommended Website Diagram

TETRA Base Station / BTS → MU → Optical Fiber → RU → Antenna → Coverage Area

The MU receives the TETRA RF signal from the base-station side and interfaces the signal with the optical fiber network.

At the remote location, the RU converts the optical signal back into RF and amplifies the signal for transmission through the local antenna system.

Uplink signals are transmitted in the reverse direction:

Antenna → RU → Optical Fiber → MU → TETRA Base Station / BTS

This architecture allows remote TETRA coverage areas to be connected to a centralized base-station location through optical fiber.

Key Specifications

Parameter	Specification
Product Type	TETRA Fiber Optical Digital Repeater – Remote Unit (RU)
Uplink / Rx Frequency	450–455 MHz
Downlink / Tx Frequency	460–465 MHz
RF Bandwidth	5 MHz
Maximum Input Power (Non-Destructive)	10 dBm
Composite DL RF Output Power	37 ± 2 dBm
Gain of RU	45 ± 3 dB
Manual Adjustable Attenuation	0–25 dB
AGC Range	≥10 dB
VSWR	≤1.5
Spurious Emission	9 kHz–1 GHz: ≤−36 dBm
	1–12.75 GHz: ≤−30 dBm
Third-Order Inter-Modulation	≤−45 dBc
System Delay	≤1.5 μs
I/O Impedance	50 Ω
RF Connector	1 × N-Female
Optical Connector	1 × LC/UPC
Fiber Type	Single Mode
Optical Output Power	0 ± 3 dBm @ 1310 nm
Optical Receiver Sensitivity	≤−12 dBm
Operating Temperature	−25°C to +55°C
Relative Humidity	≤95%, non-condensing
Power Supply	AC 220 V, 50/60 Hz
Power Consumption	≤80 W
Application	Indoor & Outdoor, IP65
Dimensions	370 × 295 × 152 mm
Weight	≤12 kg
Mounting	Wall Mounting
LED Indicators	Power Supply, Running, Alarm
Local Control	USB Interface or Wi-Fi Hotspot
Remote Monitoring	Through MU via Fiber Optical Cable

Note: Product specifications are based on the current engineering configuration and may be customized according to project requirements.

Key Features

• 450–455 MHz uplink/Rx and 460–465 MHz downlink/Tx
• 5 MHz RF bandwidth
• 37 ± 2 dBm composite downlink RF output power
• 45 ± 3 dB RU gain
• 0–25 dB manual adjustable attenuation
• AGC range ≥10 dB
• VSWR ≤1.5
• Third-order intermodulation ≤−45 dBc
• System delay ≤1.5 μs
• Single-mode optical fiber transmission
• 1 × LC/UPC optical interface
• Optical output power 0 ± 3 dBm @ 1310 nm
• Optical receiver sensitivity ≤−12 dBm
• IP65 aluminum-alloy enclosure
• Indoor and outdoor installation
• Wall-mounting design
• USB interface or Wi-Fi hotspot for local control
• Remote monitoring through MU
• Designed for TETRA fiber-optic distributed coverage systems

Technical Advantages

Fiber-Optic Distributed Coverage

The RU enables TETRA RF coverage to be extended from a centralized MU location to remote areas through a single-mode optical fiber link.

This architecture is suitable for buildings, tunnels, transportation facilities and other locations where direct RF distribution from the base-station location is impractical.

High RF Output Power

The RU provides a specified composite downlink RF output power of: 37 ± 2 dBm

This provides a suitable RF output level for remote TETRA coverage applications when integrated with an appropriate antenna and RF distribution system.

Actual coverage depends on antenna gain, feeder loss, building structure, installation environment and system configuration.

High RU Gain

The specified RU gain is: 45 ± 3 dB

The RF gain supports amplification of the received TETRA signal before transmission to the local antenna system.

Flexible RF Level Adjustment

The RU provides: 0–25 dB Manual Adjustable Attenuation

This allows installers and system engineers to adjust RF levels during commissioning and optimize the system according to the actual installation conditions.

Automatic Gain Control

The RU provides an AGC range of ≥10 dB, helping maintain the RF operating level within the required system range under varying signal conditions.

Low System Delay

The specified system delay is: ≤1.5 μs

Low delay is important in TETRA distributed RF systems where timing and signal synchronization are relevant to system performance.

Optical Fiber Interface

The RU uses:

• Single-mode optical fiber
• LC/UPC optical connector
• 1310 nm optical wavelength
• Optical output power: 0 ± 3 dBm
• Optical receiver sensitivity: ≤−12 dBm

The optical interface allows the RU to be connected to the central MU through the fiber-optic network.

IP65 Outdoor-Ready Design

The RU is specified for: Indoor & Outdoor Application — IP65

The aluminum-alloy enclosure is designed for remote installation environments where protection against dust and water ingress is required.

Working Principle

How Does a TETRA Fiber Optical Remote Unit Work?

The RU is the remote RF unit in a fiber-fed TETRA distributed coverage system.

Downlink

The downlink signal follows the path:

TETRA Base Station → MU → Optical Fiber → RU → Antenna → Coverage Area

The MU interfaces the base-station RF signal with the optical transmission system.

The optical signal is transmitted to the remote RU through single-mode optical fiber.

The RU receives the optical signal, converts it back into RF, amplifies the RF signal and sends the signal to the local antenna.

Uplink

The uplink signal follows the reverse path:

Coverage Area → Antenna → RU → Optical Fiber → MU → TETRA Base Station

The RU receives the uplink RF signal from the coverage area and converts it into an optical signal for transmission back to the MU.

The MU then interfaces the signal with the TETRA base-station system.

MU + RU System Architecture

Complete TETRA Fiber Optical Repeater System

The Lenolink TETRA fiber-optic repeater system consists primarily of:

Master Unit (MU)

Located at the central equipment side.

Main functions:

• Interfaces with the TETRA base-station RF source
• Converts RF signals to optical signals
• Receives optical uplink signals
• Provides optical communication with remote units
• Provides local system management

Remote Unit (RU)

Located at the remote coverage area.

Main functions:

• Receives optical signals from the MU
• Converts optical signals into RF
• Amplifies RF signals
• Provides RF output to the antenna
• Receives uplink RF signals
• Converts uplink RF signals into optical signals
• Sends signals back to the MU

System Flow

TETRA BTS → MU → Fiber Optical Cable → RU → Antenna

This architecture allows centralized TETRA equipment to serve multiple remote coverage areas.

Why Choose Lenolink TETRA Fiber Optical RU?

Professional RF & Wireless Communication Engineering

Lenolink provides RF, microwave and wireless communication components and systems, including RF filters, combiners, waveguide components and fiber-optic repeater products.

The Lenolink product portfolio also includes TETRA fiber-optic RU products and related repeater systems.

Designed for TETRA Distributed Coverage

The RU is specifically configured for: 450–455 MHz Uplink / Rx and 460–465 MHz Downlink / Tx

The frequency configuration is matched with the corresponding MU for system-level integration.

High-Power Remote Coverage

The RU provides a composite downlink RF output power of 37 ± 2 dBm, supporting remote TETRA coverage applications where higher RF output levels are required.

Flexible Installation

The IP65 enclosure and wall-mounting design allow the RU to be installed in a variety of indoor and outdoor locations.

Typical deployment environments include:

• Tunnels
• Transportation facilities
• Railway infrastructure
• Industrial facilities
• Large buildings
• Airports
• Critical infrastructure

Local and Remote Management

The RU supports local control through:

USB Interface or Wi-Fi Hotspot

Remote monitoring is provided through the MU via the fiber-optic connection.

This provides engineers with convenient access during installation, commissioning and maintenance.

TETRA MU vs. RU – System Role Comparison

Item	Master Unit (MU)	Remote Unit (RU)
System Position	Central equipment side	Remote coverage side
Main Function	RF / optical interface	Optical / RF conversion and amplification
Uplink / Rx	450–455 MHz	450–455 MHz
Downlink / Tx	460–465 MHz	460–465 MHz
RF Bandwidth	5 MHz	5 MHz
Optical Fiber	Single Mode	Single Mode
Installation	Indoor	Indoor / Outdoor
Protection	IP30	IP65
Mounting	19-inch 2U Rack	Wall Mounting
RF Output	—	37 ± 2 dBm
RU Gain	—	45 ± 3 dB
Manual Attenuation	0–10 dB	0–25 dB
System Delay	≤5 μs	≤1.5 μs
Optical Connector	4 × FC/APC	1 × LC/UPC
Installation	Central equipment room	Remote coverage area
Protection	IP30	IP65

Simple System Relationship

MU = Central RF / Optical Interface

RU = Remote RF Coverage Unit

This distinction helps customers select the correct equipment for a TETRA fiber-optic distributed coverage project.

Frequently Asked Questions

Q1: What is a TETRA Fiber Optical Remote Unit?

A TETRA Fiber Optical Remote Unit (RU) is a remote RF unit used in a fiber-fed TETRA distributed coverage system.

It receives optical signals from the Master Unit (MU), converts them into RF signals and amplifies them for transmission through a local antenna.

Q2: What frequency does the RU support?

The specified frequency configuration is:

Uplink / Rx: 450–455 MHz

Downlink / Tx: 460–465 MHz

The RU frequency configuration corresponds to the associated MU configuration.

Q3: What is the RF bandwidth?

The specified RF bandwidth is: 5 MHz

Q4: What is the maximum RF input power?

The specified maximum non-destructive input power is: 10 dBm

Q5: What is the RF output power?

The specified composite downlink RF output power is: 37 ± 2 dBm

Q6: What is the gain of the RU?

The specified RU gain is: 45 ± 3 dB

Q7: Can the RF level be adjusted?

Yes. The RU provides manual adjustable attenuation from: 0 to 25 dB

Q8: Does the RU have AGC?

Yes. The specified AGC range is: ≥10 dB

Q9: What is the system delay?

The specified system delay is: ≤1.5 μs

Q10: What optical fiber does the RU use?

The RU uses: Single-mode optical fiber

Q11: What optical connector does the RU use?

The specified optical connector is: 1 × LC/UPC

Q12: What is the optical output power?

The specified optical output power is: 0 ± 3 dBm @ 1310 nm

Q13: What is the optical receiver sensitivity?

The specified optical receiver sensitivity is: ≤−12 dBm

Q14: Can the RU be installed outdoors?

Yes. The RU is specified for: Indoor & Outdoor application with IP65 protection.

Actual installation should follow the applicable environmental and mounting requirements.

Q15: What is the operating temperature?

The specified operating temperature range is: −25°C to +55°C

Q16: How is the RU mounted?

The RU uses a Wall-mounting configuration

with dimensions of: 370 × 295 × 152 mm

Q17: How is the RU connected to the MU?

The RU is connected to the MU through a single-mode optical fiber link.

The MU and RU form the central and remote units of the distributed TETRA coverage system.

Q18: Can the RU be customized?

Yes. Lenolink can evaluate customized TETRA repeater requirements including:

• RF frequency
• Uplink/downlink configuration
• RF bandwidth
• Output power
• Gain
• Optical interface
• Fiber type
• Optical wavelength
• RF connector
• Mechanical enclosure
• Installation method
• Environmental requirements

Q19: How many RUs can be connected to one MU?

The number of RUs supported by one MU depends on the optical architecture and system configuration. Please contact Lenolink with the required number of remote coverage points for system evaluation.

Q20: Can the RU be used for outdoor TETRA coverage?

Yes. The RU is specified for indoor and outdoor applications with IP65 protection. It can be used for suitable outdoor TETRA coverage deployments, subject to the installation environment and system requirements.

Request a Customized TETRA Fiber Coverage Solution

Need a TETRA Fiber-Optic Repeater for Your Coverage Project?

Please provide:

✓ Required TETRA frequency range
✓ Uplink and downlink frequency configuration
✓ Required RF bandwidth
✓ Number of Remote Units
✓ Required RF output power
✓ Required fiber transmission distance
✓ RF input/output level requirements
✓ Optical fiber type
✓ Optical connector type
✓ Coverage area
✓ Indoor or outdoor installation
✓ Mounting requirements
✓ Environmental conditions

Lenolink RF engineers can evaluate the project requirements and provide a customized TETRA Fiber Optical Repeater Solution.

Contact: info@lenolink.com