96 097-55501-01 Issue 6 – June 2003
1
TimeHub 5500 System Guide
4.1 Overview
Test, install cards, cable, and configure the TimeHub 5500 using the
sequence given in this chapter after installing the shelf, and making power,
clock, and communication port connections (Installation chapter sequence).
If any difficulties are encountered during the installation process, contact
Symmetricom’s CAC. Refer to the Technical Assistance section of the
Troubleshooting chapter for telephone numbers.
4.2 Power Test
To verify power connections to the TimeHub 5500, follow the steps in
Procedure 4-1.
Procedure 4-1. Power Test
Step Action
Test Equipment: Digital multimeter (Fluke 77 or equivalent)
1 Ensure that all fuses that supply power to the TimeHub 5500 Shelf are removed from the
fuse panel and from the front of the shelf, and no clock, management, or output driver
cards are in the shelf.
2 Disconnect the
–
48V battery A and battery B leads from the shelf power terminal blocks
TB1 and TB2 (Figures 4-1 and 4-2). (Leave the Return battery leads connected to the
shelf.)
3 At the shelf end of the battery leads, use the multimeter to measure the voltage between
the following test points:
Test Point Test Point Result
Battery A lead Battery B lead 0 V
Battery A lead TB1: Return A 0 V
Battery A lead TB1: Ground 0 V
Battery B lead TB2: Return B 0 V
Battery B lead TB2: Ground 0 V
4 Reconnect the
–
48V battery A and battery B leads to the power terminal blocks (TB1 and
TB2) –
48V A and
–
48V B terminal sets on the shelf.
5 In the power source fuse panel, install the A fuse.
6 Use the multimeter to measure the voltage between the
–
48V A and Return terminals on
the TB2 terminal block on the shelf.
Requirement: The multimeter indicates –42 V dc to –56 V dc.
7 In the power source fuse panel, install the B fuse.
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