◊  Frequency Accuracy : 1E-12
◊ 1PPS Accuracy: 20ns RMS
◊  Holdover: 1µs/24 hours, 5E-11/month
◊  20 outputs (10MHz, 1PPS, TOD)
◊  LAN ( NTP, Monitor & Control)
◊ Full support for NTP/PTP Networks
◊ External 1PPS / Frequency input for disciplining
◊ C(A) code GPS receiver
◊  Front Panel Display (Time, Date, BIT and more)
◊  Monitor & control: RS232, UDP
◊  Supply Voltage: 90/260 VAC
◊  Delay Correction for Input & Output

◊  P (Y) code GPS receiver
◊  Up to 3 channels LAN interface
◊  SNMP Monitor & Control
◊  IEEE 1588 / PTP Grandmaster
◊  DDS – Up to 30MHz, 32 bit resolution
◊  Supply Voltage: DC or DC&AC
◊  External frequency and TOD distributor
◊  Graphic User Interface (GUI) Software for PC

The AR77A is a multi-function GPS Disciplined Rubidium Atomic Clock, which provides accurate time & frequency. The AR77A incorporates numerous features into a single box, including a Rubidium Frequency Standard, an internal C/A code 12 channels GPS receiver (or P(Y) code GPS receiver. The GPS receiver must be supplied by user) and an input from external 1PPS / frequency.
The various options of the unit include a variety of different frequencies and several Time Codes outputs. The Rubidium Standard functions as a local oscillator and is phase-locked to the GPS or to external inputs. All outputs are derived from the Rubidium Clock, which maintains accurate time and frequency when GPS or other inputs are interrupted. For low cost applications an Oven Control Crystal Oscillator (OCXO) is offered instead of Rubidium Frequency Standard.
The unit includes up to three physical LAN interfaces boards, which support UDP / SNMP for management and for NTP (Network Time Protocol). The three LAN boards can be used for three different networks (with three different IP network addresses), or for two networks where the 3rd LAN board is reserved as a redundant back-up. A Precision-Time Protocol (PTP) is available with one of the LAN board. The AR77A provides multiple outputs: 10 coax outputs, two fixed (10MHz and 1PPS) and 8 configurable outputs which can be selected from 1PPS, 10MHz, and more.
Additional outputs are available on the D-Type connector including differential RS422 outputs, TOD (Time Of Day) outputs with several standard protocol like NMEA, IRIG B and Have Quick. The unit is 19” x 1U rack-mountable encasement.

◊ Test Equipment
◊ Telecommunication
◊ Cellular Base Stations
◊ Scientific Equipment
◊ Secure Communication
◊ Mobile Radio Base Stations