The Spirent DLS400S is a digital loop simulator for accurate simulation of telephone loops conforming to ITU-T G.991.2/G.shdsl (Annex A) standards. Built on passive circuitry architecture, it minimizes noise interference from active components to deliver high-accuracy test results across R&D, manufacturing, and field deployment scenarios.
Technical Specifications
Frequency & Bandwidth
• Bandwidth: DC to 1.5 MHz with smooth response to 2.0 MHz
• Cable characteristic reproduction: Accurate up to 1.5 MHz; extended to 2.0 MHz in select configurations
Voltage & Current
• AC/DC voltage rating: Up to 300 V peak AC+DC (tip to ring)
• DC current rating: Up to 100 mA (150 mA peak)
• Input voltage: 100–240 VAC (automatic sensing)
• Input frequency: 50–60 Hz
• Power consumption: 120 VA maximum
Test Loop Simulation
The instrument provides seven pre-configured G.shdsl (Annex A) loop models: Ø, S, BT1-C, BT1-R, BT2-C, BT2-R, and C4. Custom wireline lengths can be programmed. Cable characteristics are replicated using networks of discrete R, L, and C components, reproducing both AC and DC line properties with high fidelity.
Impairment Simulation
Micro Interruption simulation aligns with G.shdsl standard definitions. All impairment parameters are user-configurable and applicable to both pre-configured and custom-defined loops. When combined with DLS-5500 series Noise Impairment products, the system delivers complete ITU-T G.shdsl (Annex A) test loop simulation including custom noise shapes.
– Key Features
• Passive circuitry minimizes active component noise
• SCPI-based programming for automation and integration
• User-configurable micro interruption parameters
• Compatible with DLS-8111 system for extended VDSL coverage (DC to 30 MHz)
– Compatibility & Integration
Control Interfaces
• IEEE 488 (GPIB)
• RS-232 (DCE)
• DLS-1100 Series graphical software interface for PC control
Optional Modules
• DLS 5A01H Noise Impairment Generation Modules with ITU-T G.shdsl (Annex A) noise shapes (1 or 2 units)
• National Instruments IEEE 488 card for host PC connectivity
– Physical & Environmental
• Dimensions: 194 mm (H) × 452 mm (W) × 494 mm (D)
• Weight: 28 kg (61 lbs)
• Operating temperature: +10°C to +40°C
• Storage temperature: +10°C to +40°C
• Humidity: 90% maximum (non-condensing)
