Spectracom SecureSync User Manual

adjusted according to application-specific requirements and preferences. See below for recom-
mendations on how long (short) the Holdover Timeout should be.
How to configure Holdover Timeout
To set the Holdover Timeout value:
Navigate to MANAGEMENT > OTHER: Disciplining, and click the GEAR icon in the Status
panel:
For more information on the TFOM value and Phase Error Limit, see "Configuring the
Oscillator" on page215.
Note: Changes made to the Holdover Timeout always take effect immediately. If
SecureSync is in Holdover and the Holdover timeout is changed to a value that is
less than the current time period that SecureSync has been in Holdover Mode, the
unit will immediately declare loss of synchronization.
What is the recommended setting for the Holdover Timeout period?
The factory default Holdover period is 2 hours (7200 seconds). The value can be increased to
up to 5 years. During this time period, SecureSync will be useable by its NTP clients (or other
consumers) after GNSS reception has been lost.
The length of time is really based on the type of oscillator installed in a unit, and what the typ-
ical accuracy requirements are for the NTP clients. The longer it can run in Holdover mode
before it expires, the longer it can continue being a central time source for all of its clients. But
3.4 Holdover Mode
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Spectracom SecureSync Specifications

General

Model	SecureSync
Time Reference	GPS, GLONASS, BeiDou, Galileo, IRIG, NTP, PTP, 1PPS
Disciplines	GNSS, IRIG, PTP, NTP, SyncE
Inputs	GPS, GLONASS, BeiDou, Galileo, IRIG, NTP, PTP, 1PPS
Outputs	NTP, PTP, 1PPS, IRIG
Protocols	PTP, NTP, SNMP, SSH, HTTPS
Form Factor	1U Rack-mount
Redundancy	Optional redundant power supply
Security Features	Password protection, access control lists, SSH, HTTPS, SNMPv3, NTP authentication, PTP authentication
Power Supply	100-240 VAC, 50-60 Hz
Operating Temperature	0°C to +50°C
Dimensions	44.45 mm (H) x 482.6 mm (W)