ADC ETU-751C, UTU-701C FUNCTIONAL DESCRIPTION, MAJOR COMPONENTS

700-701-100-02 Functional Description

FUNCTIONAL DESCRIPTION

This section provides a functional description of the line and desktop units, including major components, single-pair application mode, alarms, and testing (including monitoring and loopbacks).

MAJOR COMPONENTS

The major components of the line and desktop units include:

•G.703 interface (75 or 120 Ω)

•rate selectable HDSL interface (including framing, transceiver, and line interface circuits)

•system timing circuits

•processor

Figure 5 is a functional block diagram of the line and desktop units.

	100-240V			-36V to -72V
	50/60 Hz
					DC power
	AC power				(UTU-701)
	(ETU-751)
			On-board
			power
			supply
			module
			+5V, +3.3V				Timing
							circuits
75 and 120 Ω										HDSL
		G.703
				HDSL framer		Transceiver			Line interface
DTE Interface		Interface								loop
Ext. clock
from management
unit (UTU-701 only)								Control
							Processor
								Status
									Front panel
Alarm relay									control and
(UTU-701 only)									console interface
Management unit
backplane interface
(UTU-701 only)
RS-232
console port

Figure 5. Line and Desktop Unit Functional Block Diagram

UTU-701 and ETU-751 List 1 August 9, 2002 11