LTPH-TP-1047-01, Issue 1
Appendix B - Functional Operation
H2TU-R-402 List 5E
March 12, 2001
37
A
PPENDIX
B - F
UNCTIONAL
O
PERATION
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.
Figure 27.
H2TU-R-402 List 5E Block Diagram
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.
HDSL 2
XCVR
Microprocessor
Protection
Protection
Factory use only
BRG
Tip
Ring
Tip 1
Ring 1
BRG
OUT (RCV)
49
55
IN (XMT)
5
15
13
20
7
Ring
Tip
Framer
Loopback
CLOC
NREM
Circuit
Ground
17
Chassis Ground
1
+
Local/Line
Power Supply
Option
DS1 OUT
(RCV)
HDSL2
HDSL2 Span
DS1 IN
(XMT)
35
−
48V IN
27
18 K ohm, 10 mA
sealing current
termination
