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1.4 Interfaces
Table 1-2:
6 & 7
1 & 2
15 & 10
5 & 10
3, 8, 13
4, 9, 14
11 & 12
1.4.4
DCLS Output
The rear panel DCLS OUT BNC female connector defaults to a 1PPS Output (see below),
but can be configured to produce different output signals: IRIG Output, HaveQuick Output,
and GPIO Output.
1.4.4.1
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, traceable input ref-
erence
Connector: BNC female
Table 1-3:
Oscillator Type
Low-phase noise Rubid-
ium
Rubidium
Low-phase noise OCXO
OCXO
TCXO
12
Multi I/O signal defaults
Pins
DCLS OUT
DCLS IN
RS232 IN
RS232 OUT
RS485 (1)
RS485 (2)
IRIG AM OUT
1PPS output accuracies
Accuracy to UTC
(1 sigma locked to
±15 ns
±15 ns
±15 ns
±15 ns
±50 ns
Channel
Holdover (constant temp. after 2 weeks of GPS
GPS)
After 4 hours
0.2 μs
0.2 μs
0.5 μs
1μs
12 μs
Default Signal
IRIG OUT
IRIG IN
ATC IN
ATC OUT
HAVEQUICK OUT
HAVEQUICK IN
IRIG OUT (AM ONLY)
lock)
After 24 hours
1μs
1μs
10 μs
25 μs
450 μs
SecureSync 2400 Getting Started Guide Rev. 4
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