İstlink provides end-to-end engineering services for the development, design and testing of standards-compliant and custom-designed wireless and wired communication systems operating in the DC–6 GHz frequency range. Our activities cover the entire lifecycle from theoretical concept design through to prototype production and development of final products operating in field environments.

We conduct end-to-end analysis and simulation studies to predict the performance of communication systems at the earliest stage. In this scope:

• End-to-end link analysis and simulation (OMNeT++, NS-3, MATLAB, Simulink, NI AWR)
• Channel propagation model development
• Link budget and performance analyses

All physical layer components are designed and implemented according to targeted performance criteria:

• Modulation / demodulation techniques
• Coding / decoding algorithms
• Data and control information mechanisms
• Synchronization
• Channel estimation
• Filtering and other receiver algorithms

To ensure reliable and efficient data transmission:

• Logical link control
• Access control mechanisms
• Error detection and correction algorithms

For scalable and manageable communication infrastructure:

• Radio resource management
• Mobility management

We develop internationally standards-compliant and field-proven solutions:

• Cellular systems: OFDM / OFDMA, GSM, GPRS, HSPA, CDMA, LTE, WiMAX
• Short-range and private networks: Wi-Fi (IEEE 802.11 a/b/g/n/p), Bluetooth, GPS, UWB, ZigBee, RFID

We design, develop and test custom RF and microwave systems in the DC–6 GHz frequency range:

• COTS RF ICs: transceivers, mixers, PLLs, LNAs and PAs
• RF/IF filter design
• Clock circuit design and distribution
• Power circuit design
• Circuit simulation and impedance matching
• ADC, DAC, up-conversion and down-conversion architectures

We provide end-to-end development of custom embedded systems including hardware and software:

• Complete implementation and testing of PHY, MAC and network algorithms on target platforms
• Efficient VHDL development for PHY algorithms on FPGA-based systems
• Power circuit design
• Optimized C software development for MAC and network layer algorithms on CPU-based systems

Cell Broadcast Service (CBS) is a critical communications infrastructure that delivers instant broadcast messages to millions of mobile devices across selected geographic areas — with no user registration or internet connection required. Designed for public safety and crisis management, CBS is one of the most reliable ways to reach large populations at the moment they need it most.

The CBS Platform consists of two core components: the Cell Broadcast Entity (CBE) and the Cell Broadcast Center (CBC). Messages created via the CBE are packaged by the CBC module and forwarded to Radio Access Networks (RAN, MME, RNC, BSC, etc.), then broadcast directly to mobile devices through base stations in the targeted area.

CBS enables you to:

• Send simultaneous, real-time messages from central authorities to millions of users in selected regions during natural disasters and emergencies
• Establish a fast, secure, and dedicated broadcast channel between public institutions and mobile users
• Deploy a globally recognized, field-proven emergency alerting system defined by 3GPP standards

Cell Broadcast Center (CBC)

The Heart of Emergency Alerting Infrastructure

The Istlink Cell Broadcast Center (CBC) is the central system component that receives emergency messages from the CBE and instantly delivers them to all mobile devices in defined geographic areas — securely and reliably — through mobile operator infrastructure.

CBC enables a single point of origin to reach millions of users simultaneously, ensuring fast, dependable, and uninterrupted communication in critical situations. Unlike SMS-based systems, CBC operates independently of network congestion, delivering mass notifications with zero delay.

Cell Broadcast technology has been part of mobile network architecture since the late 1990s, and has since become the standard solution for disaster and emergency communications.

At the core of this architecture, the CBC:

• Receives messages created through the Cell Broadcast Entity (CBE)
• Operates in full integration with the operator's core network
• Delivers messages to designated cells via broadcast transmission

This architecture delivers:

• Simultaneous reach to an unlimited number of users
• Zero additional load on the network
• No need for individual delivery or acknowledgment processes — unlike SMS

As a result, CBC stands as one of the most dependable communication methods available, especially in time-critical scenarios.

Who Uses It?

Istlink CBC is purpose-built for institutions with national and international critical communication responsibilities:

• Governments and public authorities
• Disaster and emergency management agencies
• 112 / 911-type emergency call and coordination centers
• Civil defense and crisis management units
• Nationally authorized early warning systems

Compliance & Standards

Istlink CBC is fully compliant with global early warning and communications standards:

• EU-Alert — The European Union's official cell broadcast standard
• WEA (Wireless Emergency Alerts) — The U.S. emergency alerting system
• ETWS (Earthquake and Tsunami Warning System) — Seismic and tsunami warning standard
• CAP (Common Alerting Protocol) — Universal alerting protocol
• ATIS (Automatic Terminal Information Service) — Terminal information service standard

This compliance allows the system to adapt seamlessly to the regulatory requirements of different countries.

Complementary Products & Additional Features

CBE (Cell Broadcast Entity) — The message creation and management interface, featuring:

• Broadcast area definition
• Message template creation
• Authorization and approval workflows

Public Warning Mobile App — A mobile application that provides users with additional information and engagement capabilities:

• Track disaster and alert notifications
• Collect user feedback
• Free to download on iOS and Android

Multi-Language & Multi-Script Support — Designed for global deployment, with support for:

• Turkish, English, Arabic, Chinese, Cyrillic, Latin, and more

Technical Specifications

• GEO-targeting and GEO-fencing support
• Statistical delivery success rate reporting per broadcast zone
• Full compatibility with 2G / 3G / 4G / 5G networks
• Integration with all network nodes including AMF, MME, RNC, and BSC
• Message delivery even during active voice calls
• Country-specific configuration and customization
• Deployment and integration within 6–12 weeks

Why Istlink?

Istlink is a trusted solution partner with deep expertise in telecommunications and critical communications.

• Preferred infrastructure by leading telecom operators in Turkey
• High performance with field-proven reliability
• 24/7 post-deployment technical support and maintenance
• Flexible, customer-centric solution approach

Cell Broadcast Entity (CBE)

Your Command Center for Emergency Alerting

The CBE is the central control panel at the heart of every emergency alerting system — where messages are composed, managed, and prepared for distribution. Working in tandem with the Cell Broadcast Center (CBC), it delivers a fully integrated, end-to-end alerting infrastructure.

Use Cases

The CBE solution is actively used wherever early warning is critical:

• Weather and climate events
• Geological disasters (earthquakes, tsunamis, etc.)
• Industrial accidents
• Public health emergencies

Designed for government agencies and authorized bodies, it meets legal requirements across multiple countries.

Standard & System Compatibility

Full integration with all modern mobile and alerting standards:

• 5G / 4G / 3G / 2G network support
• EU-Alert, WEA/CMAS, ETWS
• All mobile platforms including Android and iOS
• CAP 2.1 and ATIS protocols

Key Features

Advanced capabilities that maximize operational control:

• Scheduling: time window, duration, and repeat management
• Multi-language support (TS 23.038, ISO 639 compliant)
• Multi-layer GIS mapping (online/offline)
• Role-based user management
• Comprehensive audit log records

System Advantages

Infrastructure built for high performance and resilience:

• Centralized or distributed architecture support
• Reach millions in seconds
• Automated disaster recovery
• Compliance with all industry standards
• Flexible, institution-specific configuration
• Proven at global scale

End-to-End Service

Full support throughout the entire project lifecycle:

• Analysis and planning
• Installation and integration
• Training
• Ongoing technical support

Customer Reviews

(Emergency Alert System over DAB & FM Radio)

An integrated communication solution enabling emergency messages to be delivered quickly, reliably and simultaneously over DAB (Digital Audio Broadcasting) and FM radio (RDS/TMC) broadcast infrastructure. The system enables instant notification to all devices with radio receivers during natural disasters, public safety threats, traffic accidents and critical infrastructure alerts.

Key Features and Benefits

• Simultaneous emergency broadcast over DAB and FM (RDS/TMC) infrastructure
• High availability independent of mobile networks
• National, regional and local broadcast scenarios
• Automatic interruption of existing radio broadcasts with priority alert support
• Full compatibility with in-vehicle systems and portable receivers
• Centralized message creation and broadcast management
• Multi-language and audio/text-based message support
• Advanced alarm, monitoring and reporting mechanisms
• High security, role-based authorization
• Integration with Cell Broadcast (CBS) and disaster management systems
• Modular, scalable and extensible architecture

This software is designed to automatically position the minimum number of wireless modems and access points to provide the best coverage in indoor areas such as offices, campuses, hospitals and shopping centers.

The software analyzes whether placed modems provide sufficient coverage at all points; if necessary, it recommends additional modem placement points, ensuring all areas remain covered while minimizing the number of modems and reducing installation costs.

Key Features

• Shows the required number of access points and their positions for each room.
• Users can define system parameters such as number of users, signal level and building material.
• Takes a 3D calculation approach into account.
• Floor plans can be uploaded in jpg, png or jpeg format.

Testing wireless communication products under realistic operating conditions is critically important for performance, reliability and standards compliance. İstlink has developed a specially designed hexagonal anechoic chamber solution for Wi-Fi based and multi-antenna (Wi-Fi MIMO) products. This modular structure enables simultaneous testing of up to 64 Wi-Fi products at once.

Features and Benefits

• Automatic, standards-compliant test processes
• Automatic test report generation
• Capacity to test 64 Wi-Fi products simultaneously
• Fast and repeatable test cycle

Application Areas

• Wi-Fi modems
• Smartphones
• Tablets
• Set-top boxes
• All other Wi-Fi capable devices
• R&D studies
• University education and research applications

Programmable RF switching solutions are used to provide fast and reliable switching at the RF level in scenarios where multiple Wi-Fi products are tested. The RF switching system developed by İstlink is designed to flexibly adapt to different MIMO configurations and high-volume testing needs.

Features and Benefits

• 1×8 input-output support
• 700 MHz – 6 GHz frequency range
• Maximum input signal power: 30 dBm
• Low signal loss (max. 10 dB @ 6 GHz)
• High channel isolation (50 dB @ 6 GHz)
• Low leakage level
• USB and IP control
• Simultaneous, bidirectional RF signal transmission
• Lightweight and compact design

A programmable phase and amplitude controller is an advanced test and simulation solution that enables precise and repeatable control of the phase and amplitude values of received RF signals. The product provides amplitude control between 0–110 dB with 0.25 dB step precision for signals in the 1–6 GHz frequency range.

Features and Benefits

• 4×4 input-output support
• 1 – 6 GHz frequency range
• Maximum input signal power: 30 dBm
• Wide attenuation range (0 – 110 dB)
• High attenuation resolution (0.25 dB)
• Low signal loss (max. 16.5 dB @ 6 GHz)
• Low leakage level
• USB and IP control
• Built-in fixed phase converter
• Bidirectional RF signal transmission
• Lightweight and compact design