User's Manual

ISO 9001:2000 Cert. N°4500/1
Version 1.1 SDT_ARK6_User_Manual_ENG_vATSC Page 15 of 206
3.6 System Features
Synchronization
External or GPS
Internal clock
Oven Controlled OCXO oscillator (10 MHz and 1 PPS)
Output clock
1 PPS and 10 MHz
Management
Embedded SNMP v1 server
Embedded Web server
GbE Ports
GbE 1: 10/100/1000 Base T Management port
GbE 2: 10/100/1000 Base T Data port
Security
Authentication for GUI access supported.
3.7 Synchronization
The ARK6 includes a holdover function provided by a higher grade Oven-Controlled Crystal Oscillator.
The ARK6 is equipped with an internal OCXO for improved phase noise and stability. The system is
provided with internal 10MHz and 1PPS signals which are disciplined to the GPS time signal or to the
10MHz and 1PPS external references. The stability of internal frequency and phase is assured by the
highly stable OCXO. If the satellites signal, from the GPS receiver, or the external reference sources are
completely lost, the Holdover mode enables the unit to keep working with internal 10MHz and 1PPS for
the duration of the Holdover Timeout, with very low drift over time.