2.4
Time and Frequency Signals
This section describes the timing and frequency signals the GridTime
™
3000 GNSS Time Server can output, or use
as a time source for synchronization.
The GridTime 3000 can send and receive a variety of modern and legacy time signals for time and frequency
synchronization and syntonization.
The GridTime 3000 can output the following time and frequency signals:
• Unmodulated IRIG-B signals:
– IRIG-B004 with AFNOR or C37.118.1 extensions
– IRIG-B005 with AFNOR or C37.118.1 extensions
– IRIG-B006
– IRIG-B007
• Amplitude modulated IRIG-B (AM IRIG-B) signals:
– IRIG-B124 with AFNOR or C37.118.1 extensions
– IRIG-B125 with AFNOR or C37.118.1 extensions
– IRIG-B126
– IRIG-B127
• Modified Manchester modulated IRIG-B signals:
– IRIG-B224 with AFNOR or C37.118.1 extensions
– IRIG-B225 with AFNOR or C37.118.1 extensions
– IRIG-B226
– IRIG-B227
• Simulated DCF77 receiver output signal
• Custom pulse train signal (Programmable Pulse):
– Custom frequency — 1 pulse per day to 250 pulses per second
– Custom phase offset — none through to 1 wave period, configurable to the millisecond
– Custom Duration — none through to 1 wave period, configurable to the millisecond
• Output of ITU-T G.703 signals:
– T1/J1 interface at 1.544 kbits/s - G.703 section 7
– E1 interface at 2.048 kbits/s - G.703 section 11
– 2.048 MHz fixed frequency sine and square wave - G.703 section 15
– 1.544 MHz fixed frequency sine and square wave - Also follows G.703 section 15
– 10 MHz fixed frequency sine and square wave - G.703 section 20
• Output of time strings over a serial RS422 or RS232 connection (See
12.7. Time String Specifications
for string
content definitions):
– NGTS string
– IRIG J-1x string
– String A-String H serial strings
– NMEA ZDA string
– NMEA RMC string
• PTP server mode support:
– IEEE
®
1588-2008 E2E Default Profile server
– IEEE 1588-2008 P2P Default Profile server
– IEEE C37.238-2011 Power Profile server
– IEEE C37.238-2017 Power Profile server
– IEC/IEEE 61850-9-3 Power Utility Profile server
– ITU-T G.8275.1 Telecom Profile
– ITU-T G.8265.1 Telecom Profile
• NTP server support:
Key Benefits
©
2022 Microchip Technology Inc.
and its subsidiaries
Manual
DS00004572A-page 9
