Passive Mobile GSM Interceptor
FortiLink Systems Passive Mobile GSM Interceptor – Wideband System
The FLS-PMGISWB600 Passive Mobile GSM Interceptor Wideband System is a multi-channel solution for radio monitoring and passive interception of GSM cellular communications. The system supports GSM networks using A5/1 and A5/2 encryption algorithms and is designed for comprehensive monitoring, analysis, and recording of GSM traffic across multiple frequency bands.
Operating in both real-time and delayed modes, the system enables full-session reconstruction, technical network analysis, and secure data storage through an operator workstation with specialized software.
System Architecture
The system consists of the following main components:
- Signal Reception and Processing Unit (SRPU)
- A5/1 Deciphering Unit
- Operator’s Workstation (Laptop-based)
- Specialized Software Suite
- Wideband Multiband Receiver
- GSM Mobile Terminal with NetMonitor Function
- Power Supply and Antenna System
Antenna Configuration
- Omnidirectional magnet mount antenna 7 dB (GSM signal reception)
- Omnidirectional magnet mount antenna 3 dB (embedded GSM modem)
- GPS magnet mount antenna (system positioning)
- Directional antenna 12 dB with mast mounting bracket
- Antenna amplifier for directional antenna
Functional Capabilities
Network Monitoring & Analysis
- Detection and identification of BTS control channels across the full GSM frequency range
- Visualization of the radio frequency environment at the current location
- Real-time evaluation of signal strength and quality
- Monitoring of control channel messaging between BTSs and mobile stations
Target Selection & Identification
- Selection by IMSI, IMEI, IMEISV, and TMSI
- Filtering by Class Mark
- Target selection by distance from BTS
- Matchmaking between MSISDN and IMSI/TMSI through active search
Traffic Interception & Processing
- Passive interception of uplink and downlink traffic channels (subject to signal strength)
- Real-time playback of voice traffic with automatic traffic channel switching
- Support for handover processing between BTSs
- Full support for frequency hopping
- Display of DTMF digits during calls
Voice, Messaging & Data
- Real-time and recorded playback of voice calls
- Viewing of SMS and USSD messages
- Support for speech codecs:
- HR, FR, EFR
- AMR-FR, AMR-HR
- AMR-WB
Encryption & Decoding
- Real-time decryption of A5/1 and A5/2
- Dedicated A5/1 deciphering unit for key recovery
Data Recording & Storage
- Continuous recording of all GSM sessions
- Delayed-mode session reconstruction
- Centralized database for:
- Voice recordings
- SMS and signaling data
- Subscriber and service information
- Multi-user remote access to stored data
Software & Security
- User authorization required for system access
- Independent database management shell
- Integration with Navitron GIS for GPS data visualization
- Supported OS:
- Windows XP
- Windows Server 2003
- Windows 7
- Windows 8
Technical Specifications
Radio Receiver
| Parameter | Specification |
| Supported Bands | GSM 850, R-GSM 900, DCS 1800, PCS 1900 |
| Real-Time Duplex Channels | 64 / 128 / 256 / 576 |
| Delayed-Time Duplex Channels | 256 / 512 / 1028 / 2304 (all time slots per ARFCN) |
| Receiving Sensitivity | −105 dBm |
| External Interface | Ethernet |
| Power Supply | 220 V ±10%, 50 Hz |
576-channel configuration enables reception of all duplex calls within a single LAC.
SRPU Configurations & Dimensions
| Model | Dimensions |
| Radius-WB-64 | 324 × 268 × 147 mm |
| Radius-WB-128 (Diversity) | 361 × 330 × 147 mm |
| Radius-WB-256 (Diversity) | 361 × 330 × 147 mm |
| Radius-WB-576 | 19″ Rack, 3U (15) |
A5/1 Deciphering Unit
| Parameter | Specification |
| Key Calculation Performance | 5 to 160 keys/second |
| External Interface | Ethernet |
Operator Workstation
| Component | Specification |
| Processor | Intel® Core™ i7 (Quad-Core) |
| RAM | 8 GB |
| Storage | 750 GB SSD |
