Product Summary

The Lenolink Multi-Band Fiber Optical Digital Repeater Master Unit (MU) is designed as the central RF-to-optical unit of a fiber-optic distributed cellular coverage system.

The specified configuration supports three cellular frequency bands:

• UMTS 900: 880–915 MHz uplink / 925–960 MHz downlink
• LTE 1800: 1710–1785 MHz uplink / 1805–1880 MHz downlink
• LTE 2100: 1920–1980 MHz uplink / 2110–2170 MHz downlink

The MU supports independent digital filtering for each supported band. The specified configuration provides 4 sub-bands per system band, with each sub-band supporting a variable bandwidth of 1–3 MHz.

Each sub-band can be individually switched ON or OFF through software, providing flexible frequency allocation and system configuration.

The MU provides:

• 27 ± 2 dBm UL RF output power per band
• 45 ± 3 dB gain per band
• 0–31 dB gain adjustment per sub-band
• ≤20 km specified transmission distance
• 4 × LC/UPC optical interfaces
• 1 × N-Female RF interface
• Single-mode fiber transmission

The unit is designed for indoor and outdoor installation with an IP65 application rating and a wall-mounted mechanical configuration.

Typical System Configuration

The MU is installed at the central equipment side of the fiber-optic distributed coverage system.

Base Station / BTS → RF → MU → Optical Fiber → Remote Unit → Antenna → Coverage Area

The MU receives RF signals from the cellular base-station side and performs digital filtering and RF/optical conversion.

The processed RF signals are transmitted through a single-mode optical fiber link to remote units.

At the remote location, the remote unit converts the optical signal back to RF and provides RF coverage through the antenna system.

Multi-Band System Architecture

UMTS900 + LTE1800 + LTE2100

The multi-band configuration allows several cellular services to be distributed through a common fiber-optic coverage architecture.

Key Specifications

Parameter	Specification
Product Type	Multi-Band Fiber Optical Digital Repeater – Master Unit (MU)
System Bands	UMTS900 / LTE1800 / LTE2100
UMTS900 Uplink	880–915 MHz
UMTS900 Downlink	925–960 MHz
LTE1800 Uplink	1710–1785 MHz
LTE1800 Downlink	1805–1880 MHz
LTE2100 Uplink	1920–1980 MHz
LTE2100 Downlink	2110–2170 MHz
Digital Filter	4 sub-bands per band
Sub-Band Bandwidth	1–3 MHz variable per sub-band
Sub-Band Control	Individually switchable ON/OFF by software
UL RF Output Power	27 ± 2 dBm per band
MU Gain	45 ± 3 dB per band
Gain Adjustment Range	0–31 dB, adjustable for each sub-band
Transmission Distance	≤20 km
Maximum Input Power	−10 dBm, non-destructive
VSWR	≤1.5
Spurious Emission	9 kHz–1 GHz: ≤−36 dBm
Spurious Emission	1 GHz–12.75 GHz: ≤−30 dBm
Noise Figure @ 1 RU Connection	≤8 dB
System Delay	≤5 μs
I/O Impedance	50 Ω
RF Connector	1 × N-Female
Fiber Connector	4 × LC/UPC
Fiber Type	Single Mode
Optical Output Power	−3 ± 3 dBm @ 1550 nm
Optical Receiver Sensitivity	≥−12 dBm
Power Supply	AC 220 V, 50/60 Hz
Power Consumption	≤120 W
Temperature Range	−20°C to +50°C
Humidity	≤95%, non-condensing
Application	Indoor & Outdoor, IP65
Dimensions	447 × 357 × 171 mm
Weight	≤16 kg
Mounting	Wall Mounted
Local Control	Via USB Interface

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

Key Features

• Triple-band cellular operation
• UMTS900 / LTE1800 / LTE2100 support
• 4 independently configurable sub-bands per system band
• 1–3 MHz variable bandwidth per sub-band
• Individual software ON/OFF control for each sub-band
• 27 ± 2 dBm UL RF output power per band
• 45 ± 3 dB gain per band
• 0–31 dB gain adjustment for each sub-band
• up to 20 km fiber transmission distance
• Single-mode optical fiber transmission
• 4 × LC/UPC optical connectors
• 1 × N-Female RF connector
• Optical output power −3 ± 3 dBm @ 1550 nm
• Optical receiver sensitivity ≥−12 dBm
• VSWR ≤1.5
• System delay ≤5 μs
• IP65 indoor/outdoor application
• Wall-mounted design
• USB local control
• Designed for multi-band cellular distributed coverage systems

Technical Advantages

Multi-Band Cellular Coverage

The MU supports three cellular frequency bands within one distributed coverage platform: UMTS900 + LTE1800 + LTE2100

This allows multiple wireless services to be distributed through a common fiber-optic infrastructure.

Flexible Digital Sub-Band Filtering

One of the main technical features of this MU is its configurable digital filtering architecture.

The specified configuration provides: 4 sub-bands per system band

Each sub-band supports: 1–3 MHz variable bandwidth

Each sub-band can also be individually switched: ON / OFF by software

This provides greater flexibility than a fixed wideband RF repeater when a project requires selective frequency allocation.

Independent Gain Adjustment

The MU provides a gain adjustment range of: 0–31 dB

The gain can be adjusted for each sub-band according to the specified configuration.

This allows system engineers to optimize RF levels during system commissioning and frequency planning.

Multi-Band RF Output

The specified UL RF output power is: 27 ± 2 dBm per band

The MU gain is: 45 ± 3 dB per band

These parameters provide the RF level required for the optical distribution system while maintaining independent control of the supported cellular bands.

Long-Distance Fiber Transmission

The specified transmission distance is: ≤20 km

This allows the MU to support distributed coverage systems where remote units are located considerable distances from the central equipment room.

Actual transmission distance should be evaluated according to optical link budget, fiber type, connector loss, optical output power, receiver sensitivity and system configuration.

Single-Mode Optical Interface

The MU uses:

• Single-mode optical fiber
• 4 × LC/UPC optical connectors
• 1550 nm optical wavelength
• −3 ± 3 dBm optical output power
• ≥−12 dBm optical receiver sensitivity

The multi-port optical interface allows the MU to support distributed remote-unit configurations.

IP65 Enclosure

The specified application rating is: Indoor & Outdoor — IP65

The wall-mounted enclosure is designed for deployment in equipment rooms, technical areas and suitable outdoor installation environments.

Working Principle

How Does a Fiber Optical Digital Repeater MU Work?

The MU and RU form a bidirectional RF-over-fiber architecture for centralized multi-band cellular coverage.

Downlink

The basic signal path is:

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

The MU receives the downlink RF signals from the base-station side.

The required frequency sub-bands are digitally selected and processed according to the configured system parameters.

The RF signals are then converted into optical signals and transmitted to remote units through single-mode optical fiber.

The remote units convert the optical signals back into RF signals and provide coverage through the antenna system.

Uplink

The uplink signal travels in the reverse direction:

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

This architecture provides bidirectional RF distribution between the central base-station location and remote coverage areas.

Digital Filter Configuration

Flexible Sub-Band Selection

The MU supports digital filtering for each supported cellular band.

The specified architecture provides: 4 sub-bands per band

Each sub-band supports: 1–3 MHz variable bandwidth

Each sub-band can be individually configured and switched ON/OFF through software.

This feature can be particularly useful when a coverage project requires only selected channels or frequency blocks rather than the entire available band.

Example

For a specific LTE band, the system engineer can configure the required frequency sub-bands and disable unused sub-bands.

This can help provide:

• Selective frequency distribution
• Flexible spectrum allocation
• Reduced unnecessary RF transmission
• Easier system commissioning
• Adaptation to different operator frequency configurations

Why Choose Lenolink Multi-Band Fiber Optical Digital Repeater MU?

Multi-Band Coverage in One Platform

UMTS900 + LTE1800 + LTE2100

Flexible Digital Sub-Band Configuration

4 independently configurable sub-bands per band

1–3 MHz variable bandwidth

Software ON/OFF control

Independent RF Level Adjustment

0–31 dB gain adjustment per sub-band

Long-Distance Fiber Distribution

Up to 20 km specified transmission distance

Engineering-Oriented Customization

Frequency / sub-band / optical interface / RF level / mechanical configuration

Frequently Asked Questions

Q1: What is a Multi-Band Fiber Optical Digital Repeater MU?

A Fiber Optical Digital Repeater Master Unit (MU) is the central unit of a fiber-fed cellular distributed coverage system.

It interfaces with the base-station RF source, performs digital RF processing and connects the RF system to remote units through optical fiber.

Q2: Which frequency bands does this MU support?

The specified configuration supports:

UMTS900: 880–915 MHz uplink / 925–960 MHz downlink

LTE1800: 1710–1785 MHz uplink / 1805–1880 MHz downlink

LTE2100: 1920–1980 MHz uplink / 2110–2170 MHz downlink

Q3: How many sub-bands can be configured?

The specification provides: 4 sub-bands per system band.

Q4: What is the bandwidth of each sub-band?

Each sub-band supports a variable bandwidth of: 1–3 MHz

Q5: Can individual sub-bands be switched off?

Yes. According to the supplied specification, each sub-band can be individually switched ON or OFF by software.

Q6: What is the gain of the MU?

The specified MU gain is: 45 ± 3 dB per band

Q7: Can the gain be adjusted?

Yes. The specified gain adjustment range is: 0–31 dB

The gain can be adjusted for each sub-band.

Q8: What is the UL RF output power?

The specified UL RF output power is: 27 ± 2 dBm per band

Q9: What is the maximum fiber transmission distance?

The specified transmission distance is: ≤20 km

Actual transmission performance depends on the complete optical link configuration.

Q10: What type of optical fiber does the MU use?

The MU uses: Single-mode fiber

Q11: What optical connector is used?

The specification lists: 4 × LC/UPC

Q12: What is the optical output power?

The specified optical output power is: −3 ± 3 dBm @ 1550 nm

Q13: What is the optical receiver sensitivity?

The supplied specification lists: ≥−12 dBm

This value should be retained exactly as specified in the engineering specification.

Q14: What RF connector is used?

The specified RF interface is: 1 × N-Female

Q15: What is the system delay?

The specified system delay is: ≤5 μs

Q16: Can the MU be installed outdoors?

The specification identifies the application as: Indoor & Outdoor, IP65

Actual installation should comply with the applicable environmental, power supply and mounting requirements.

Q17: How is the MU mounted?

The specified mounting method is: Wall Mounted

The dimensions are:447 × 357 × 171 mm

Q18: Does the MU support local control?

Yes. The specified local control interface is: USB Interface

Q19: Can Lenolink customize the system?

Yes. Lenolink can evaluate project-specific requirements including:

• Frequency configuration
• Uplink/downlink frequency
• Sub-band allocation
• Digital filter requirements
• RF output power
• Gain
• Optical architecture
• Fiber type
• Optical connector
• Number of remote units
• Mechanical enclosure
• Installation environment

Q20: Can different cellular bands be configured independently?

Yes. The specified digital architecture provides four configurable sub-bands for each supported cellular band. Each sub-band can be configured with a 1–3 MHz variable bandwidth and individually switched ON or OFF through software.

Q21: How many sub-bands can the MU support?

The specified configuration provides four sub-bands per cellular band, supporting up to 12 configurable sub-bands across UMTS900, LTE1800 and LTE2100.

Request a Customized Multi-Band Fiber Optical Coverage Solution

Need a Multi-Band Cellular Fiber Optical Repeater?

Please provide:

✓ Required frequency bands
✓ Uplink and downlink frequencies
✓ Required sub-band configuration
✓ Required sub-band bandwidth
✓ Number of remote units
✓ Required RF output power
✓ Required gain
✓ Required fiber transmission distance
✓ 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 Multi-Band Fiber Optical Digital Repeater Solution.

Contact: info@lenolink.com