Overview
The REF-DS-10 is a high-stability signal generator designed by Digital Instruments S.r.l. It provides precise Time (PPS) and Frequency (10 MHz) signals through two independent modules. These modules can be tuned using high-quality oscillators (OCXO) and can utilize various synchronization sources such as GPS, satellite systems, optical fiber, and E1/T1. The system ensures reliability by allowing both sources to work in combination, minimizing output gaps and simplifying user parameter settings. The modules are designed for easy removal and replacement.

Switch Unit Features
- 10 independent BNC connectors for 10 MHz frequency, each with 13 dBm power level.
- 10 independent PPS connectors with TTL level terminated at 50 Ohm.
- 7 dry contacts for electrical signaling.
- 4 photo-coupled inputs for remote control.
- RS232 standard serial connection.
- Ethernet 10/100 network connection with TCP/IP protocol and SNMPv1 support.
- Integrated web server for browser management.
- Logical OR device supply.
- AC power supply: 110-240 Vac, 50/60 Hz.
- 19’’ rack, 1U size.

Generator Module Features
- 12-channel GPS receiver with automatic tracking and timing error management.
- Removable drawer container (120x220 mm).

Technical Specifications
Frequency Reference
- Signal: 10 MHz sine wave.
- Spectral purity: -70 dBc (harmonics), -75 dBc (non-harmonics).
- Phase noise: -125 dBc at 1 kHz.
- 10 independent outputs, each with 13 dBm level.
- Output impedance: 50 Ω, BNC connectors.
- Stability: 1e-12 daily average OCXO locked at GPS.

Time Reference
- Signal: 1 PPS, 100 µs Duty, Rising Edge.
- 10 independent outputs, TTL 5 Vpp, square wave.
- Output impedance: 50 Ω, BNC connectors.

GPS Section
- 12 Channels L1 1575.42 MHz receiver.
- Tracks up to 12 satellites.
- PPS precision: < 50 ns.
- Antenna connector: TNC.
- Capture time: < 4 min.

E1/T1 Section
- Signal standard: E1 256S multiframe CRC-4.
- Input/output impedance: 75 Ω, BNC connectors.

Signaling
- RS-232 connection with DB9 Male connector.
- Ethernet interface with TCP/IP protocol.
- 7 dry contacts and 4 photo-coupled contacts for remote signaling.

Supply
- Network: 95-240 Vac, IEC320 plug, EMI/RFI filter.
- Battery: 2 independent power suppliers.

Size
- Width: 1U 19'' rack.
- Depth: 300 mm (excluding connectors).
- Weight: 1.5 Kg.