Spectracom NetClock 9400 Series, User Reference Manual

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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 2 weeks 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
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CHAPTER
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NetClock User Reference Guide Rev. 16
1.10 Specifications