12713020-002-2 Revision D – April 2004 SSU-2000 User’s Guide 73
Installing the SSU-2000
Connecting Antennas
Connecting Antennas
The SSU-2000 shelf has two antenna connections on the rear panel. The antenna
connections are made via isolated TNC connector J6 labeled ANTENNA-A and
Isolated TNC connector J7 labeled ANTENNA-B. These TNCs are DC isolated and
AC bypassed to frame ground. These connections are used for radio receiver
antenna connections only. Refer to Appendix C, Antennas, for installation
procedures and additional instructions.
Connector J6 is wired to slot A3 in the shelf, and Connector J7 is wired to slot A5.
Connecting an SDU-2000 Expansion Shelf
The SSU-2000 Main shelf has two interface connectors to connect an SDU-2000
Expansion shelf. You can connect up to four SDU-2000 shelves in a daisy-chain
fashion using the Expansion Interface cable (part number 12013050-xxx-0 and the
Backup Clock cable (12013115-xxx-0). These connections are made through
connector J8, a DB25S female connector with locking post, labeled SDU
INTERFACE, and connector J9, a BNO connector labeled SDU BACKUP CLK
.
These connectors are on the rear panel of the SSU-2000, and are shown in Figure
2-8. The corresponding connectors on the rear panel of the SDU-2000 are shown in
Figure 2-9.
All signals on J8 are in differential pairs; each pair is terminated by installing the
Expansion Terminator (part number 12013049-000-0), which has a series 0.001 µF
capacitor and 120 Ω resistor. The SDU backup clock signal on connector J9 is a
differential pair; it is terminated with 120 Ω using switch S2 on the rear panel.
Warning: To avoid serious personal injury or death, exercise
caution when working near high voltage lines. In particular:
Use extreme caution when installing the GPS antenna near,
under, or around high voltage lines.
Follow local building electrical codes for grounding using the
frame ground lugs integrated with the SSU-2000 shelf.
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