Spectra EC22S, Руководство пользователя

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EPSILON CLOCK MODEL EC22S Spectracom Corporation
EPSILON CLOCK User’s Manual 8-2
8.1.4 BNC – External Ref Input
50 Ω , TTL level input of the 1PPS (1 pulse per second) reference input.
8.1.5 TNC - GPS Antenna
50
Ω
input from the GPS antenna GPS.
8.1.6 Alarms
Pin Signal Description
1 Common 1 Urgent Alarm common contact
2 TX TOD Transmission of Time Of Day message
3 RX TOD Not used
4 Common 2 Warning common contact
5 GND Electrical ground
6 Active Closed 1 Urgent Alarm active closed contact
7 Active Open 1 Urgent Alarm active opened contact
8 Active Closed 2 Warning active closed contact
9 Active Open 2 Warning active opened contact
Table 8 - 3. connector ALARMS.
If one wants to get a closed contact when Urgent Alarm is active, 1-6 should be used.
If one wants to get a closed contact when Non Urgent Alarm is active, 4-8 should be
used.
If one wants to get an opened contact when Urgent Alarm is active, 1-7 should be used.
If one wants to get an opened contact when Non Urgent Alarm is active, 4-9 should be
used.
8.2
8.2 8.2
8.2 GPS Antenna Installation
GPS Antenna Installation GPS Antenna Installation
GPS Antenna Installation
Before choosing the GPS Antenna and the connecting cable between the GPS Antenna
and the EPSILON SSU, perform the following steps:
- Choose the antenna location
- Evaluate the overall gain
- Choose the antenna and cable type
8.2.1 GPS Antenna Location
Choose a location with an unobstructed view of the sky. The EC22S will determine its
location automatically once locked to the appropriate number of satellites. The minimum
number of tracked GPS satellites is four. A vertical observation cone with an open view