Appendix B - Functional Operation; Timing; Ground Fault Detect; H2Tu-C-231 List 1F Block Diagram - ADC HIGAIN HDSL2 Manual

Appendix B - Functional Operation

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 Overlapped Pulse Amplitude
Modulation Transmission with Interlocking Spectra (OPTIS) transceiver systems to establish full-duplex, 1.552
kbps data channels between the H2TU-C-231 and a remotely located H2TU-R.
A block diagram of the H2TU-C-231 is shown in
stream from the DSX-1 digital cross-connect interface. The H2TU-C contains a DS1 frame synchronizer
controlled by an 8-bit microprocessor that determines the type of framing on the DS1 stream. The H2TU-C
synchronizes with the type of framing detected. The H2TU-C recognizes Superframe (SF), including D4, or
Extended Superframe (ESF).
T
IMING
The low loop wander (0.5 UI max) of an H2TU-C, when used with remote units, allows the circuit to be used in
all critical timing applications, including those used to transport Stratum 1 timing.
G F
ROUND AULT
The H2TU-C has a Ground Fault Detect (GFD) circuit which detects a ground or a resistive path to ground on any
wire of the HDSL2 loop. This makes the product compliant with the Class A2 requirements of GR-1089.
64
B - F
UNCTIONAL
Figure 35. H2TU-C-231 List 1F Block Diagram
D
ETECT
October 2, 2000
O
PERATION
Figure 35. The H2TU-C-231 receives a 1.544 Mbps DSX-1 data
152-231-116-01, Revision 01
H2TU-C-231 List 1F