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VCL-2145-LC, GPS Primary Reference Clock (PRC)

GPS Primary Reference Clock (PRC) provides 1 PPS, NMEA, 1/5/10MHz, 2.048MHz, 2.048Mbits with SSM, 1.544Mbits clock outputs with high stability OCXO Holdover Clock. Rubidium Clock option available.


The VCL-2145-LC (VCL-GPS-2145), GPS Primary Reference (PRC) Clock is specifically designed for frequency synchronization of 2G, 3G, HetNet and LTE mobile telecommunications networks as well as backhaul wire-line SDH / SONET and Synchronous Ethernet networks. It may be also used by Railways, Airports (and air-traffic control), Power generation and distribution companies and other Utility companies who require a highly precise G.811 frequency synchronization locked to a GPS Reference.

The VCL-2145-LC (VCL-GPS-2145) locks to a GPS reference to provide multiple G.811 / Stratum 1 quality frequency outputs. The VCL-2145-LC is also equipped highly accurate, low-noise OCXO / Rubidium oscillator which provides a high stability, ITU-T G.812 compliant holdover clock that is typical of a Network SSU in the event of unavailability of the GPS signal, or GPS antenna failure.


  • Reliable, Cost-Efficient Reference GPS Receiver
  • 50 Channel GPS, L1 frequency, C/A Code Receiver
  • Simultaneous tracking of up to 12 GPS satellites
  • ITU-T G.811 Primary Reference (PRC) Clock
  • GPS locked G.703 compliant E1, 2.048 MBits, 1.544 Mbits and 2.048 MHZ outputs
  • Primary reference and holdover functionality:
    • ITU-T G.811 / Stratum 1 compliant (PR) Primary Reference when locked to GPS
    • ITU-T G.812 compliant holdover
  • SSM Message format Compliant with ITU-T G.704. Optional GR-378-CORE for SONET Networks
  • 1/5/10 MHZ output
  • 2Mhz and 2Mbps Primary Reference Clock outputs
  • 1 PPS outputs
  • Standard RJ45 and BNC connectors for all inputs and outputs
  • ToD compliant to NMEA 0183 (DB9 Serial Port).

Standards & Compliance

  • IEC - EMC – Certified to EN 55022: 2005 / CISPR 22, EN 55024:2005, IEC 61000-4-2
  • CE - 2001/95/EC, 2006/95/EC, EN60950-1, EN61000-6-2, EN61000-6-4
  • FCC - FCC Part 15 B Class A : Conducted Emission test on Power Line
    FCC Part 15 B Class A : Radiated Emission >1 GHz FCC, 6 GHz, on Power Line

Additional Features:

  • Telnet, SNMP V2 MIB, Password Protection
  • Redundant AC and DC power supply options
  • Power Contact and Lightening Protection as per Telcordia GR-1089-CORE.

Typical Synchronization Applications:

  • Synchronizing Cellular networks like UMTS, GPRS, 3G and LTE
  • Power generation and distribution companies and other utility companies
  • Wireless and Wireline Telecom synchronization
  • Synchronization of Defense Networks
  • Synchronizing airports and aviation communications
  • Synchronizing railway signaling networks and railway communications
  • Broadcasting Network and Broadcast equipment synchronization.

GPS, Primary Reference Clock

Model Description
VCL-2145-LC (VCL-GPS-2145),
GPS Primary Reference (PRC) Clock		 (i) VCL-2145-LC, GPS Primary Reference (PRC) G.811 Clock.
Provides 1PPS, NMEA, 1/5/10MHz, 2.048MHz, 2.048Mbits with SSM, 1.544Mbits Frequency Outputs with High Stability OCXO (G.812) Holdover.

 

(ii) VCL-2145-LC, GPS Primary Reference (PRC) G.811 Clock.
Provides 1PPS, NMEA, 1/5/10MHz, 2.048MHz, 2.048Mbits with SSM, 1.544Mbits Frequency Outputs with Ultra-High Stability Rubidium (G.812) Holdover.

Technical Specifications

GPS Receiver:

  • 50 Channel GPS Receiver
  • GPS L1 frequency, C/A Code Receiver
  • Tracks up to 12 satellites simultaneously
  • Synchronizing Time:
    • Acquisition time - Hot Start: Less than 15 sec.
    • Acquisition time - Warm Start: Less than 45 sec.
    • Acquisition time - Cold Start: Less than 140 sec.
  • GPS Signal:
    • Tracking and Navigation: -162 dBm
    • Reacquisition -160 dBm
    • Cold Start -148 dBm
  • Antenna Connector: TNC
  • Accuracy Of Time-Pulse Signal referenced to GPS: +/-30ns (raw)
  • Accuracy Of Time-Pulse Signal referenced to GPS: +/-15ns (compensated)
    (Note: with all satellites in view at -130db)

Internal (G.812) Synchronization Options:

  • Rubidium
  • OCXO (Oven-Controlled Crystal Oscillator)

Management and Monitoring Ports:

  • RS-232C
  • USB
  • 10/100BaseT Ethernet - RJ-45
  • 2 x External Alarm Relay Contacts.

System Access, Control and Management Options:

  • Telnet
  • CLI Control Interface (HyperTerminal or VT100)
  • SNMP V2 Traps (MIB File provided)

Security and Protection:

  • Password Protection

Configuration and Monitoring Software:

  • Telnet, CLI
  • GUI (Graphical User Interface) - Runs on any PC operating on Windows XP, Windows 7, Windows 8 OS or Windows 10 OS.

Power Supply Options:

  • Dual Redundant
  • 1+1 AC power (100 to 240V AC, 50/60 Hz)
  • 1+1 DC 24V power
  • 1+1 DC -48V power
  • 1+1 DC 110/125V DC power
  • AC or DC

Power Consumption:

Power Consumption with OCXO Oscillator:

  • <25W during startup,
  • <18W at steady state 23°C

Power Consumption with Rubidium Oscillator:

  • < 40W during startup,
  • < 32W at steady state 23°C

Clock performance - GPS

  • ITU-T G.811

Frequency Accuracy:

  • <1x10-11; (24 hour average)
  • G.811 quality when locked to GPS

Frequency Holdover

  • Long-term stability: 1x10-10/day, 2x10-8/year
  • Frequency stability: 6x10-10(-50°C to +55°C)

Enviromental

Environmental characteristics (Equipment):

  • Operational: -10°C to +60°C (Typical: +25°C)
  • Cold start: -0°C to +50°C
  • Storage: -20°C to +70°C
  • Humidity: 95% non-condensing
  • Cooling: Convention Cooled. No cooling fans are required

MTBF:

MTBF for VCL-2145-LC with RbXO Option:

  • Per MIL-HDBK-217F: ≥ 17 years @ 40°C
  • Per Telcordia SSR 332, Issue 1: ≥ 20 years @ 40°C

MTBF for VCL-2145-L C with OCXO Option:

  • Per MIL-HDBK-217F: ≥ 21 years @ 40°C
  • Per Telcordia SSR 332, Issue 1: ≥ 24 years @ 40°C

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Hotline: 0919.900.247