LARUS STS5800 STARSYNC GPS STRATUM 1 PRIMARY REFERENCE SOURCE w / GPS Antenna

The LARUS STS5800 StarSync is a GPS Stratum 1 Primary Reference Source delivering precise time synchronization for critical infrastructure and network timing applications. This Building Integrated Timing System (BITS) clock maintains Stratum 2 or Stratum 3E holdover performance during GPS signal loss, combining an ultra-stable ovenized reference oscillator with Kalman filtering and patented digital frequency synthesis. Output MTIE performance exceeds GR-2380 mask requirements by ten to twenty times typical GPS solutions.

Designed for small installations and remote sites including cell sites and PCS networks, the system installs in under ten minutes with full connectorization.

Technical Specifications

• Timing Source: GPS Stratum 1 Primary Reference Source


• Holdover Performance: Stratum 2 or Stratum 3E


• Holdover Drift: <5 × 10⁻⁹ per day over any ±10°C temperature range


• Reference Oscillator: Ultra-stable ovenized design with Kalman filtering and digital frequency synthesis


• Output MTIE: Meets GR-2380 mask performance; 10–20× improvement over typical GPS solutions


• System Supply Voltage: −48 VDC nominal


• Power Dissipation: Less than 30 watts


• Power Inputs: −48 VDC A & B inputs

Key Features

• Ten DS1 outputs with extended or standard SuperFrame framing


• Ten composite clock (CC) outputs


• Four DS1 input ports: two for GPS-unavailable tracking, two for performance monitoring


• Four RS422 outputs for data distribution


• One office alarm interface


• Local and remote RS232D management ports


• Alarm data log captures one week of events


• 19-inch or 23-inch rack mount; 17 × 10 × 3.5 inches (W × D × H)


• Passive GPS antenna with up to 500 feet of coaxial cable


• Operating temperature: −40° to +75°C (extended) or 0° to +55°C (standard)

Typical Applications

• Cell site and PCS network timing


• Small installations and remote site deployments


• Critical infrastructure requiring continuous, accurate synchronization

Compatibility & Integration

• Meets Bellcore NEBS TR-EOP-000063, GR-1244, and GR-2830 standards


• 25-pair telco-style and 25-pin subminiature D connectors for standard integration


• DS1 framing supports both ESF and SF configurations