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Appendix B - Functional Operation 152-402-145-02, Issue 2
34 June 16, 2000 H2TU-R-402
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.
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.
HDSL2
XCVR
Microprocessor
Protection
Protection
Factory use only
BRG
Tip
Ring
Tip1
Ring1
BRG
OUT(RCV)
49
55
IN(XMT)
5
15
13
20
7
Ring
Tip
Framer
Loopback
CLOC
NREM
Circuit
Ground
17
Chassis Ground
1
+
Power
Supply
DS1 OUT
(RCV)
HDSL2
HDSL2 Span
DS1 IN
(XMT)
35
- 48V IN
27