LTPH-UM-1234-01 | Appendix A - Functional Description |
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APPENDIX A - FUNCTIONAL
DESCRIPTION
HiGain uses the ADC Two-Binary, One-Quaternary (2B1Q) HDSL transceiver system to establish two full-duplex 784 kbps data channels between the HLU, HDU, and HRU units. Each HDU-409 increases the maximum range by approximately 12,000 feet (3.7 km) using 24 AWG or 9,000 feet (2.75 km) using 26 AWG per doubler. See Table 2 on page 3 for deployment rules.
A block diagram of the HDU-409 with pinouts is shown in Figure 7 on page 25. The doubler unit power supply uses the HDSL simplified line voltage to produce +5 Vdc and +3 Vdc required by the HDU-409 electronics. The power feed is passed on to the HDSL output pair to power a second doubler or a remote unit.
The typical power dissipation of the doubler unit is 3W.
Tip | 6 | | | Loop 1 | 4 Tip HDSL 1 |
HDSL 1 IN | | |
| | 3 Ring | OUT |
Ring | 5 | | | |
| | | |
| | Power | | 475 K | | | |
| - | +5 V HDSL | | HDSL | | |
| Supply | | | |
| 80 to 200 V | IN | | OUT | | |
CO | + | and | +3 V XCVRS | | XCVRS | | Field |
GFD | | |
| | | | | | |
| | | | Output | | | |
| | | | Span | | | |
10 | | | | Voltage Status | | | |
1 | | | | Control | | | |
| | | | | | |
Frame | | | Microprocessor | | | |
Ground | | | | | |
| | | | | |
Tip | 9 | | | Loop 2 | 12 | Tip | |
HDSL 2 IN | | | HDSL 2 OUT |
Ring | 8 | | | | 11 | Ring |
| | | | | | H0083-A |
Figure 7. Doubler Block Diagram
HDU-409 Lists 1, 2, and 3 | April 30, 2003 | 25 |