Appendix B - Functional Operation; H2Tu-C-388 List 1E Block Diagram Timing - ADC HiGain H2TU-C-388 List 1E User Manual

Appendix B - Functional Operation

A
PPENDIX
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 Overlapped Pulse
Amplitude Modulation (PAM) Transmission with Interlocking Spectra (OPTIS) transceiver systems to establish
full-duplex, 1.552 kbps data channels between the H2TU-C-388 and a remotely located H2TU-R.
Figure 28 shows a block diagram of the H2TU-C-388. The H2TU-C-388 receives a 1.544 Mbps DSX-1 data
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 and synchronizes to
it. The H2TU-C recognizes Superframe (SF), including D4, or Extended Superframe (ESF) framing.
D
Tip
109
S
XMT
X
110
Ring
1
BRG
LINE
A
Fuse alarm 117
-48Vdc 217
Power Supply
B
118
119
Ground
120
Management bus
104
Pre-equalizer
LINE
BRG
D
Tip 1
S
114
X RCV
115
1
Ring 1
The low loop wander (0.3 UI max) of an H2TU-C, when used with remote units, allows the circuit to be used in
all critical timing applications, including those that are used to transport Stratum 1 timing.
60
B - F
UNCTIONAL
T1
Framer
MODE SEL
Select
Microprocessor
Status
Figure 28. H2TU-C-388 List 1E Block Diagram Timing
O
PERATION
A
HDSL2
B
Framer
and ground fault detect)
RS-232
April 21, 2000
152-388-115-03, Issue 03
HDSL 2
XCVR
-185 Vdc +
Power
Supply
(Ground isolated
_
H2TU-C-388 List 1E
Tip
101
HDSL 2
SPAN
102
Ring