List of Figures LTPH-UM-1234-01vi April 30, 2003 HDU-409 Lists 1, 2, and 3LIST OF F IGURES1. HDU-409 Front Panel ...........................................................................32. Typical HDU Installation with PG-Flex ...............................................73. Two Doubler HDU Installation with PG-Flex ......................................84. AT&T 819 Enclosure, Slot Locations 1 through 14 ...........................175. Installing the HDU-409 in an Enclosure .............................................206. HiGain Loopbacks...............................................................................247. Doubler Block Diagram ......................................................................25LIST OF T ABLES1. Front Panel Components and Labels ......................................................42. Front Panel Status Indicator LED...........................................................53. HDU-409 Circuit Ranges........................................................................64. HDU-409 Indoor Enclosure Capacities ................................................115. Capacities with Full Solar Load, 239 T1 Repeaters .............................126. Capacities with Full Solar Load, LD-1 Repeaters ................................157. SPLB Generic Command Set ...............................................................238. HDSL Signal Cable Loss......................................................................269. Fault Isolation Guide ............................................................................3010. Fault Isolation Guide for PG-Flex ........................................................31