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.
1.10.9 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 1-3:
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
Rubidium ±25 ns 0.2 μs 1μs
Standard OCXO ±50 ns 1μs 25 μs
TCXO ±50 ns 12 μs 450 μs
1.10.10 10 MHz Output (NetClock 9483 Only)
Signal: 10 MHz sine wave
Signal Level: +13 dBm ±2dB into 50 Ω
Harmonics: ˗40 dBc minimum
Spurious: ˗70 dBc minimum TCXO
Connector: BNC female
Signature Control: This configurable feature removes the output signal whenever a
major alarm condition or loss of time synchronization condition is present. The output
will be restored once the fault condition is corrected.
Table 1-4:
10 MHz output — oscillator types and accuracies
Oscillator Type Accuracy
Rubidium 1x10
-12
typical 24-hour average locked to GPS
1x10
-11
per day (5x10
-11
per month) typical aging unlocked
22
CHAPTER 1 • NetClock User Reference Guide Rev. 16
1.10 Specifications
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