1.3.3 RS-232 Serial Port (Front Panel)
Function: Accepts commands to locally configure the IP network parameters via CLI for ini-
tial unit configuration.
Connector: DB9F, pin assignments conform to EIA/TIA-574, data communication equip-
ment
Character structure: ASCII, 9600 baud, 1 start, 8 data, 1 stop, no parity
1.3.4 10/100 Ethernet Port
Function: 10/100 Base-T, auto-sensing LAN connection for NTP/SNTP and remote man-
agement and configuration, monitoring, diagnostics and upgrade
Connector: RJ45, Network IEEE 802.3
1.3.5 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 ref-
erence
Connector: BNC female
Table 1-2:
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 Rubid-
ium
±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
10
SecureSync Getting Started Guide Rev. 12.0
1.3 Specifications
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