Appendix B - Functional Operation | 152-402-145-02, Issue 2 |
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APPENDIX B - FUNCTIONAL OPERATION
ADC HDSL2 technology provides full-duplex services at standard DS1 rates over copper wires between an H2TU-C and an H2TU-R, which comprise one HiGain HDSL2 system. HiGain HDSL2 systems use ADC Overlapped PAM Transmission with Interlocking Spectra (OPTIS) transceiver systems to establish full-duplex, 1.552 kbps data channels between the remotely located H2TU-R-402 List 4E and an H2TU-C.
A block diagram of the H2TU-R-402 List 4E is shown in Figure 25.
The H2TU-R-402 List 4E power supply converts the 90 to 200 Vdc power that is received on the simplex pairs to voltage and currents required by the remote unit circuitry.
| | | | Tip 1 | |
| | | | 5 | DS1 OUT |
| 20 | Factory use only | | Protection |
| | (RCV) |
| | Ring | | 15 | |
| 13 | | Ring 1 |
| | HDSL 2 | BRG | OUT (RCV) |
| HDSL2 Span |
| XCVR | | |
7
Tip
HDSL2
Framer
48V IN
35 | Power | Loopback |
17 | Supply | CLOC |
| + | NREM |
| Circuit |
| |
| Ground | |
1 | Chassis Ground | |
27 
BRG IN (XMT)
Microprocessor | | Tip | |
| 55 | DS1 IN |
| Protection |
| |
| 49 | (XMT) |
| |
| | |
| | Ring | |
Figure 25. H2TU-R-402 List 4E Block Diagram
TIMING
The low-loop wander (0.3 UI max) of an H2TU-R-402, when used with a compatible line unit, allows the circuit to be used in all critical timing applications, including those that are used to transport Stratum 1 timing.
34 | June 16, 2000 | H2TU-R-402 |