EPSILON CLOCK MODEL EC1S
Spectracom Corporation
EPSILON CLOCK User’s Manual
3-2
3.2
3.2
3.2
3.2
1PPS Output
1PPS Output
1PPS Output
1PPS Output
Connector:
PPS
SMA Female
Pin Settings
Center contact:
Periodic pulse
Outer contact:
Electrical ground of the “GND” pins.
Signal characteristics:
EC1S-LC
EC1S-SO
EC1S-DO
Signal waveform High-level
Low level
> 2.4 V load 50
Ω
< 0.8 V load 50
Ω
Period
1s
Active edge
rising
Rising edge duration
< 20 ns load 50
Ω
Pulse duration
100
µ
s
±
10
µ
s
Accuracy to UTC, GPS locked ± 100 ns (1
σ
)
± 25 ns (1
σ
)
± 25 ns (1
σ
)
Holdover mode after 4 hours
1day
(at constant temperature, after 24
hours of GPS lock and 2 weeks of
continuous operation)
30 µs
200 µs
0.8 µs
12 µs
0.6 µs
7 µs
If required, the squelch function of the1 PPS output can be implemented on the EC1S. This
requires the user to download an alternative firmware version (to be checked with the
factory).
If this function is available, the 1 PPS distribution stops in case of alarm.
3.3
3.3
3.3
3.3
Remote Control Interface (RS232C)
Remote Control Interface (RS232C)
Remote Control Interface (RS232C)
Remote Control Interface (RS232C)
Serial port parameters:
9600 bps, 8 bits, 1 stop bit, odd parity
Protocol / syntax / format of messages:
Refer to Remote Control Interface
Data:
Binary (two's complement)
Order of bytes emitted:
Most significant bytes first
Connector J1: Sub D (HE501) 9-pin female
Pin settings:
Pin
Setting
2
Transmit remote signal
3
Receive remote signal
5
Ground
