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700-701-100-02 Overview
UTU-701 and ETU-751 List 1 August 9, 2002 1
OVERVIEW
ADC
®
WorldDSL
™
offers High-bit-rate Digital Subscriber Line (HDSL) Line Termination Units (LTUs),
Network Termination Units (NTUs), Universal Termination Units (UTUs), and ETSI Termination Units (ETUs).
The units are shelf and enclosure mounted, providing full-duplex transmission of up to 2.048 Mbps data over
one or two twisted pairs of copper wire. Public carriers and private network providers can use these units to offer
low-cost service with fiber-optic quality using the local copper loop without installing repeaters or conditioning
the outside plant. The units are used in systems that comply with European Telecommunication Standards Institute
(ETSI) specification TS 101 135.
This practice describes the WorldDSL RS UTU-701C List 1 and ETU-751C List 1 Rate Selectable HDSL line and
desktop units. The terms for these units are defined as follows:
• LTU and NTU are defined by ETSI to distinguish between the two units in an HDSL system. An LTU is
generally located at the Exchange Office end of the circuit and acts as the master unit. The NTU is located at
the customer site and acts as the slave unit.
• UTU is defined by ADC. These are programmable HDSL line units that can be configured as an
LTU (master) or an NTU (slave). The UTU default configuration is NTU (slave). The UTUs do not provide
line power to other HDSL units. All other aspects of UTU functionality are identical to LTUs or NTUs. The
UTU-701C has a G.703 interface and must be locally powered from a -36 Vdc to -72 Vdc power supply.
• ETU is defined by ADC. These are programmable HDSL line units housed in plastic enclosures with interface
and power connectors for convenient use as integrated desktop units. The ETUs can be configured as an LTU
or an NTU. The ETU default configuration is NTU. The ETU-751C does not provide or receive line power;
it must be locally powered. All other aspects of ETU functionality are identical to LTUs or NTUs. The
ETU-751C has a G.703 interface and contains a power supply that accepts 100 to 240 volt, 50 or 60 Hz,
AC power.
• WorldDSL RS (rate selectable) is defined by ADC. WorldDSL RS is a single pair High-bit-rate Digital
Subscriber Line (HDSL) solution that offers extended reach capabilities through the use of industry-leading
multi-rate DSL technology. The UTU-701C and ETU-751C deploy HDSL in networks using a single pair of
copper wire running at speeds between 256 kbps and 2048 kbps. The HDSL payload rates are menu selected
in time slot increments of 64 kbps, ranging from 256 kbps to 2048 kbps. Transmission ranges vary according
to the rate selected. Depending on noise environment, ranges of up to 7.1 km (4.4 miles) are possible at the
lowest-selectable HDSL payload rate (256 kbps) using 0.51 mm wire. Longer ranges are possible with larger
wire.
• These HDSL units are configured as Data Communications Equipment (DCE) and respond to data, clock, and
control signals from Data Terminal Equipment (DTE).
RATE SELECTABLE HDSL UNIT FIRMWARE
Version 4.01 is the current release for the rate selectable HDSL unit firmware. This firmware must be installed at
each end of the circuit (that is, in both the LTU and NTU).
Use of this product in a manner other than defined in this technical practice may cause
equipment damage or injury to personnel.
Gebrauch dieses Produkts in einer Weise anders als definiert kann in dieser technischen Praxis
Geräte Schaden oder Verletzung zu Personal verursachen.
WorldDSL RS units are not backward compatible with standard HDSL or management unit
firmware. The installed firmware must be that designed for RS units.
RS G.703 LTUs can communicate with RS Nx64k NTUs, but only if HDSL unit firmware
Version 4.01 or later is installed at each end of the circuit.