VCL-2145-DE

ITU-T, GPS / GNSS (1+1), PRC (G.811), PTP, NTP, IRIG-B

VCL Products > GPS > VCL-2145-DE, PTP / NTP Extension Module

Extension Module - Front
Extension Module - Back
Extension Module - Front
Extension Module - Back

VCL-2145-DE, PTP / NTP Extension Module

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VCL-2145-D-E is a high-performance, GPS / GNSS (Global Navigation Satellite System) Primary Reference Clock that provides ITU-T G.811 Primary Reference Clock, PTP (IEEE 1588v2), NTP and IRIG-B outputs which are locked with GPS/GNSS or user-selected input reference source. (i.e., 2.048 Mbit/s (E1), 2.048 MHz and 10 MHz). The VCL-2145-D-E Satellite Receiver also has an integrated, high bandwidth NTP Server engine that is capable of handling up to 8,900 NTP requests per second. Multiple IRIG-B Outputs are also provided to synchronize local clock (time-of-day) display units to a central timing source with nanosecond accuracy. Semi-modular GPS clock offering multiple factory-configured IRIG-B and 1PPS output options, ensuring reliable and stable time synchronization for critical applications.

Features and Highlights:

  • Reliable, Cost-Efficient Reference GPS Receiver
  • 50 Channel GNSS, L1 frequency, C/A Code Receiver
  • Up to 8,900 NTP requests per second
    • 71,200 NTP Slaves supported
    • 445,000 SNTP Slaves supported
  • ITU-T G.811 / Stratum 1 compliant (PR) Primary Reference when locked to GPS
  • ITU-T G.812 compliant holdover function
  • SSM Message format Compliant with ITU-T G.704. Optional GR-378-CORE for SONET Networks
  • GPS locked G.703 compliant 1.544Mbits, 2.048MBits, 2.048 MHz and 1 PPS outputs
  • 1/5/10 MHz, 1 PPS and IRIG-B outputs
  • IEEE-1588v2 PTP Grandmaster
  • ToD compliant to NMEA 0183 (DB9 Serial Port)
  • 4 x 10/100/1000BaseT NTP Ports
  • Additional 1 x 10/100 BaseT NTP Port for IPv4 / IPv6 operation
  • Leap Second Correction Support
  • Concurrent IPv4 and IPv6 Operations
  • MD5 authentication for NTP clients
  • 802.1Q VLAN support for NTP Ports
  • SSH, Telnet, Radius, SNMP V2 MIB, Password Protection
  • Available with 1+0 (VCL-2145-D-E, without GPS redundancy) and 1+1 (VCL-2145-D-E, with GPS redundancy) options
  • Power Contact and Lightening Protection as per Telcordia GR-1089-CORE.
  • Standard RJ45 and BNC connectors for all inputs and outputs
  • LCD display with back light.
  • Supports the KEY for MD5 encrypted NTP/SNTP packets
  • Support anti-jamming and anti-spoofing
  • GNSS Options:
    • GPS, GLONASS, GPS+GLONASS and GPS+GLONASS+SBAS
Inputs: GPS/GNSS (1+1), 10MHz, 2.048MHz, 2.048Mbit/s (E1)
Outputs: NTP, PTP, 1.544Mbit/s (T1) / 2.048Mbit/s (E1), 2.048MHz, 10MHz, 1PPS, 1PPM, IRIG-B, ToD NMEA-0183
Power Supply: 24V DC, 48V DC, 110-220V DC, 110-240V AC, 1+1 Redundant PSU
Service Capacity:: Suitable for servicing up to 8900 NTP / SNTP requests per second.

Application Diagram:


PTP / NTP Extension Module

GPS/GNSS Receiver Specifications:

  • 50 Channel GPS Receiver
  • 72 Channel GNSS Receiver
  • GPS L1 frequency, C/A Code Receiver
  • Tracks up to 12 satellites in GPS only mode (GPS only version)
  • Tracks up to 24 satellites in GNSS mode (GNSS version)
  • Synchronizing Time:
    • Acquisition time - Hot Start: 1 sec.
    • Acquisition time - Warm Start: 28 sec.
    • Acquisition time - Cold Start: 28 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 GNSS: ± 20ns (raw)
  • Accuracy Of Time-Pulse Signal referenced to GPS/GNSS: ± 15ns (compensated)
    (Note: with all satellites in view at -130db)
  • Phase Accuracy: As per ITU-T G.8272

Extension Unit Available Interfaces Options:

2488 4 Port x Unmodulated, 50 Ohms IRIG-B Interfaces (BNC F Connector)
2482-P 4 Port x 1PPS, 50 Ohms (BNC F connector) Interfaces
2727-P 1 Port x 1PPS (Optical, Transmitter, 820nm, ST, Tx) interface
2480 4 Port x Modulated IRIG-B (BNC F Connector) interfaces
2444-485 4 Port x Unmodulated IRIG-B [RS485 / RS422] interfaces (8X2 M Terminal Block)
2447-232 4 Port x Unmodulated IRIG-B [RS232] interfaces (8X2 M Terminal Block)
2482-M 4 Port x 10MHz interfaces (BNC F connector)
2727-I 1 Port x IRIG-B (Optical, Transmitter 820nm, ST, Tx) interfaces
2485-N - 2 Port x NMEA (RJ45 F Connector) and
- 2 Port x 1PPS (BNC F Connector) Card (4 Cards (Max) per Chassis)

Synchronization Input:

Input Number of Input Connector
GPS / GNSS 1+1 or 1+0 TNC

External Frequency Synchronization Inputs:

External Inputs Number of Inputs Connector
2.048 MHz, 75 Ohms 1 BNC
10 MHz, 50 Ohms 1 BNC
2.048 Mbps 1 BNC

Standard Frequency and ToD* Outputs:

Outputs: Number of Ports Connector
ITU-T G.811 Complaint 2.048 Mbit/s (E1) / 1.544 Mbit/s (T1) 8 (8E1 or 8T1) RJ45
ITU-T G.811 Complaint 2.048 MHz, 75 Ohms 8 BNC
ITU-T G.811 Complaint 1/5/10 MHz, 50 Ohms 1 BNC
IEEE 1588v2 PTP Grandmaster: 10/100/1000 BaseT 1 RJ45
IRIG-B (Modulated) 4/8/12/16 BNC
IRIG-B (Unmodulated) 6/10/14/18/22 BNC / Terminal
1 PPS Optical 1/2/3/4 ST
1 PPS, phase-locked to UTC 4/8/12/16 BNC
TOD (Time-Of-Day) output compliant to NMEA0183 2/4/6/8 DB9, RS232C
NTP, 10/100/1000 BaseT (Default configuration) 4 RJ45

*ToD Time Of Day