Symmetricom 1100 Verifying Power and Grounding Connections, Rear Access Shelf Front Access Shelf

Chapter 3 Installing the TimeProvider

Making Connections

Rear Access Shelf	Front Access Shelf
Pin 1: -48 V DC Battery	Pin 1: Frame ground
Pin 2: -48 V DC RTN	Pin 2: -48 V DC negative lead
	Pin 3: Return

Figure 3-5. Power Terminal Connectors

Figure 3-6. Assembling the ETSI (Front Access) Power Connector

Expansion Panel

All connections to the Expansion Panel, including power, are made using the interconnection cable, part number 060-58002-03.

Verifying Power and Grounding Connections

To verify power and grounding connections:

1.Using a DVM, measure the voltage between pins 1 and 2 on the rear access (NEBS) connector or between pins 2 and 3 of the front access (ETSI) connector.

2.Verify that voltage is –36 to –72 V DC. The inputs are protected against reverse polarity.

62 TimeProvider User’s Guide 097-58001-02 Revision G – April 2008