1.7.5 Protocols Supported
NTP: NTP Version4 (Installed: Version 4.2.8p8). Provides MD5, Stratum1 through 15 (RFC
5905). Note that NTP Autokey is currently not supported, for more information, see
http://bugs.ntp.org/show_bug.cgi?id=3005.
NTP throughput: ETH0: 7000-7200 NTP requests per second; ETH1-ETH3 (1204-006-0600
GigabitEthernet option card 1-3): 8800-9000 NTP requests per second. For additional inform-
ation, please contact Spectracom.
Clients supported: The number of users supported depends on the class of network and the sub-
net mask for the network. A gateway greatly increases the number of users.
TCP/IP application protocols for browser-based configuration and monitoring: HTTP, HTTPS
FTP/SFTP: For remote upload of system logs and (RFC 959)
Syslog: Provides remote log storage (RFCs 3164 and 5424)
SNMP: Supports v1, v2c, and v3
Telnet/SSH: For limited remote configuration
Security features: Up to 32-character password, Telnet Disable, FTP Disable, Secure SNMP,
SNMP Disable, HTTPS/HTTP Disable, SCP, SSH, SFTP.
Authentication: LDAP v2 and v3, RADIUS, MD5 Passwords, NTP Autokey protocol.
1.7.6 1PPS Output
Signal: One pulse-per-second square wave (ext. reference connected to GNSS receiver)
Signal level: TTL compatible, 4.3 V minimum, base-to-peak into 50 Ω
Pulse width: Configurable pulse width (200 ms by default)
Pulse width range: 20 ns to 900 ms
Rise time: <10 ns
Accuracy: Positive edge within ±50 ns of UTC when locked to a valid 1PPS input reference
Connector: BNC female
Table 1-6:
1PPS output accuracies
Oscillator Type
Accuracy to UTC
(1 sigma locked to GPS)
Holdover (constant temp. after 2weeks of GPS lock)
After 4 hours After 24 hours
Low-phase noise Rubidium ±25 ns 0.2 μs 1μs
Rubidium ±25 ns 0.2 μs 1μs
Low-phase noise OCXO ±25 ns 0.5 μs 10 μs
OCXO ±50 ns 1μs 25 μs
TCXO ±50 ns 12 μs 450 μs
24
CHAPTER 1 • SecureSync User Reference Guide Rev. 26
1.7 Specifications
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