PTP Grandmaster Clock, GPS, IP, Quantum Atomic Clock accurate to 0.00050 ppm
The AVN-GMCCS is an IEEE1588-2008 PTPv2 grandmaster clock for use in AoIP applications to synchronise all the nodes within a network using a GPS reference. The AVN-GMCCS uses an Quantum Atomic controlled oscillator to provide clocking 0.0005ppm clocking accuracy. (worst case 1 sec gain/loss every 63 years)
In normal operation, the unit has PTPv2 time stamping resolution to 8nsec. It uses a combination of a GPS receiver, a PLL (phase lock loop) and a specialist on-board clock device to create the precise, low jitter clock signals required to drive the physical transceiver’s time stamping circuitry, also providing holdover if the GPS signal is lost.
GPS presence and the number of satellites received is shown on the front panel, together with status information on output sample rates, sync type and profile type. The unit also has a screen-saver option which shows the current time.
Although designed as a grandmaster clock, a separate clock input can act as an alternative reference source to GPS which the unit can ‘slave’ to. Clock outputs, driven from the physical transceiver, can be used to provide media clocks for external equipment local to the AVN-GMC when it is in both ‘master’ and ‘slave’ states. The clock outputs are available as a single AES-3id output and two outputs which can be selected as either word clock or variable PPS. The wordclock can operate at 32, 44.1, 48, 96, 176.4 and 192kHz. When set as a variable PPS output, the unit can act as a clock master to distribute a reference frequency to test and measurement equipment.
The unit shows UTC as standard, but can be set to show ‘local time’ on the front panel, by adding a time offset. Daylight saving time changes can be accommodated by entering Spring Forward and Fall Back dates. It has a real time clock so that accurate date and time is available even after the unit is repowered without GPS access.
The built-in webserver, or front panel OLED display, can be used to configure the unit. The webserver is a responsive design meaning that it can be used with small screens on smartphones and tablets.
Typical Applications: Synchronise a PTP AoIP network, provide a GPS referenced signal via AES-3id, provide a master wordclock studio output or distribute a PPS reference frequency to T&M equipment.
Features:
• AES67/RAVENNA/AES-R16 compatible.
• GPS satellites received indicator.
• Master and slave sync modes.
• 8ns PTPv2 time stamping resolution.
• Holdover drift <1ppm, with options for <0.01ppm & <0.0005ppm.
• AES-3id, wordclock & variable PPS outputs.
• Analogue master input.
• Dual power supply inputs.
• Front panel display.
• GPS sync and power supply present LED indicators.
• Real time clock for accurate date/time.
• Responsive design Ethernet webserver and front panel control & configuration.