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LTPH-TP-1047-01, Issue 1
A
PPENDIX
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 system. HiGain systems use ADC Overlapped Pulse
Amplitude Modulation (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 5E and an H2TU-C.
A block diagram of the H2TU-R-402 List 5E is shown in
The H2TU-R-402 List 5E power supply converts the 185 Vdc power that is received over the HDSL2 span to
voltage and currents required by the remote unit circuitry. In addition, it can be powered by a 48 V local power
supply.
Factory use only
20
Ring
13
HDSL2 Span
7
Tip
18 K ohm, 10 mA
sealing current
termination
−48V IN
35
Local/Line
Power Supply
17
+
Option
Circuit
Ground
Chassis Ground
1
27
T
IMING
The low-loop wander (0.3 UI max) of an H2TU-R, when used with compatible line units, allows the circuit to be
used in all critical timing applications, including those that are used to transport Stratum 1 timing.
H2TU-R-402 List 5E
B - F
UNCTIONAL
HDSL 2
XCVR
HDSL2
Framer
Loopback
CLOC
NREM
Microprocessor
Figure 27. H2TU-R-402 List 5E Block Diagram
March 12, 2001
O
PERATION
Figure
27.
Protection
Protection
Appendix B - Functional Operation
Tip 1
5
DS1 OUT
(RCV)
15
Ring 1
BRG
OUT (RCV)
IN (XMT)
BRG
Tip
55
DS1 IN
(XMT)
49
Ring
37
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