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

VCL-2145-DE, PTP / NTP Extension Module

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., 2.048Mbit/s (E1), 2.048MHz and 10MHz). 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.

Extension Module IEEE 1588v2 PTP Switch IPv4/v6 and IEEE 802.3

Features
Specifications

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
SyncE
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
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:

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