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097-58001-02 Revision G – April 2008 TimeProvider User’s Guide 33
Chapter 1 Overview of the TimeProvider
System Power
Output Module
The Output module provides the output connectors for the TimeProvider. Like the
Input module, each Output module uses one of a variety of connectors that match
the wiring system at the installation site. Making Output Connections, on page 66,
describes the Output Modules available for the TimeProvider and the Expansion
Panel.
Expansion Panel
The Expansion Panel provides up to 32 additional outputs that the TimeProvider
can generate. See Expansion Panel, on page 21 and Rack Mounting, on page 56
for more information.
TimeProvider Interface Unit
The TimeProvider Interface Unit (TPIU) provides power, communication, and a
composite timing reference signal between the antenna and the TimeProvider main
shelf. The TPIU is an external, stand-alone rack mounted assembly included in
Antenna Kits 990-58545-01 and 990-58545-02. The TPIU can be used only with
IMC card 090-58031-01. During antenna installation, you can use the LEDs on the
TPIU to detail the status of the received power and antenna communication. See
Making GPS Connections, on page 71 for more information.
System Power
The TimeProvider main shelf has redundant –48v DC inputs. The inputs are diode
or’d; in the event that one supply fails, the other takes over. The –48v returns are
isolated from the chassis and circuit grounds. A 5 A fuse on the IOC protects the
TimeProvider; the shelf is protected from damage in case the connections are
reversed.
The power supply range is from –36 to –72 V DC. The power requirements vary
according to the type of IOC installed;
Table 1-1
lists the power requirements.
The procedure for installing power is described in Making Power Connections, on
page 61.
Table 1-1. 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)