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Symmetricom 1000 User Manual

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Chapter 7 Specifications of the TimeProvider
Alarms
200  TimeProvider User’s Guide
097-58001-02 Revision G – April 2008
Alarms
Input Alarms
The PRS input is inhibited when a contact closure (less than 1 
Ω) is present across 
the PRS Alarm In connection.
Output Alarms
The output alarm connector is on the Input module, and can be either a DB25 
connector or wire-wrap pins. See
, 
for a 
pinout diagram of the DB-25 connector. 
 describes the contact closure for 
the alarm outputs.
Power
Dual power supplies from –36 to –72 V DC. 
 lists the maximum and typical 
power consumption using crystal and Rubidium IOCs.
Symmetricom recommends a 5 A fuse for the power supply to the TimeProvider 
shelf.
Table 7-6.  Output Alarm Specifications
Alarm
Description
Minor
Contact closure (NC or NO) 1 Amp Form C
Major
Contact closure (NC or NO) 1 Amp Form C
Critical
Contact closure (NC or NO) 1 Amp Form C
Table 7-7.  Typical Power Consumption
IOC Type
Max Power (W) 
per IOC
Typical Power (W) 
per IOC
Crystal
40
30
Rubidium
60
40
(70 with two Rb IOCs)