9300 & 9200 Series - Modem

• Back-up for GPS enhances reliability
• Use as primary for start-up or where GPS is not practical

• Supports NIST ACTS and SPRING ACTS
• Supports ITU-R TF583.2, ITU-R TF583.4
• GPS Backup: If the GPS signal is lost, the NetClock unit can automatically dial NIST, etc. to maintain Stratum 1 operation. 
• Primary: If a given NetClock installation location does not lend itself to a rooftop or window mount GPS antenna, but has analog telecom lines, the administrator can set up the modem as the primary time source.

• Recur at intervals (every N minutes, or hours, or days
• Recur periodic: daily, weekly, monthly, yearly
• Test now or test on interval
• At boot up, if out of sync
• Number of retries
• Calibrate modem latency
• Dial-out log

Introduction

Spectracom NetClock® products are GPS-based, Network Time Protocol (NTP) time servers or master clocks. NetClocks typically provide timing services to various networking devices. To provide another source of Legally Traceable Time®, NetClock products also support dial-out modem capability.

While GPS satellites are the most accurate time source widely available for applications including network time synchronization, NetClock products also offer a dial-out modem option for those rare occurrences when the GPS signal is lost or otherwise unavailable. Option 03, Modem, is available for the Model 9283 and the Model 9289.