Sonifex AVN-GMCOS, PTP Grandmaster Clock with GPS Receiver

Sonifex AVN-GMCOS, PTP Grandmaster Clock with GPS Receiver

The AVN-GMCOS is a PTPv2 grandmaster clock for use with AoIP applications which uses a temperature controlled crystal for GPS holdover accuracy. IEEE1588-2008 PTPv2 (precision time protocol) is used to synchronise all the nodes within a network. To achieve this one of the nodes must become the master clock and distribute time packets to the others. The AVN-GMCOS is designed to perform this role simply and accurately, enabling sub micro second synchronisation between all nodes. RAVENNA (of which AES67 is a subset) allows for the distribution of audio across a network. For this to be possible, each of the nodes needs to be time synchronised with one another. RAVENNA uses PTP time stamping to achieve this, which distributes the network time but also works out the latency involved in the delivery and adjusts the time at each node accordingly.

• AES67/RAVENNA/AES-R16 compatible.
• GPS satellites received indicator.
• Master and slave sync modes.
• 8ns PTPv2 time stamping resolution.
• Holdover drift <1ppm, with an option for <0.01ppm.
• 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.

Timing Specification

• Profile Support: Default (RAVENNA), Media (AES67), AES-R16-2016 (SMPTE-ST 2059-2 & AES67 compatible), Custom profile
• Timing Protocol: PTPv2, IEEE1588-2008
• Timing Accuracy: PTP time stamping resolution 8ns
• Holdover Drift: TCXO: <90ms
• Holdover Drift: These figures are over 24 hours at constant temperature
• GPS Performance: 50 channel GPS receiver
• GPS Frequency: 1575.42MHz, L1 band

Clock Specification

• Input Impedance: 75Ω
• Output Impedance: <75Ω
• Antenna Impedance: 50Ω

Connections

• Clocking Input: BNC female
• Clocking Outputs: 3 x BNC female Wordclock, AES-3id @ 32, 44.1, 48, 96, 176.4 & 192kHz Variable PPS (1, 10, 100, 1000) TTL
• GPS Input: SMA socket, 80mA max
• GPIO: D-Type female 9 way
• Ethernet Port: RJ45 socket, 100 BASE-T
• Mains AC Input: Universal filtered IEC socket, continuously rated 85-264 VAC @47-63Hz, max 10W
• DC Input: 1 x 12V, KPJX-45 socket, positive pins 1 and 3
• Maximum Operating Range (DC): 10.3V to 13.2V DC

Physical Specification

• Dimensions (Raw): 4.4cm (H) x 48.3cm (W) x 17.8cm (D(1U)
• Dimensions (Raw): 1.8” (H) x 19” (W) x 7” (D) (1U)
• Dimensions (Boxed): 6.8cm (H) x 58.8cm (W) x 27cm (D)
• Dimensions (Boxed): 2.7” (H) x 23” (W) x 10.6” (D)
• Weight: Net: 1.5kg Gross: 2.2kg
• Weight: Net: 3.2lbs Gross: 4.8lbs