700-701-100-02

Overview

 

 

Customer Side

Network Side

UTU-701

(LTU)

Exchange

OfficeHDSL

DTE

4 Time Slots

G.703

(256 kbps)

Single Pair

HDSL loop

Time Slots 1 through 4 +Time Slots 0 and 16

(384 kbps)

UTU-701

(NTU)

HDSL

4 Time Slots

Customer

PC

G.703

DTE

 

(256 kbps)

 

 

 

Figure 1. Leased Line Data Application on a Single-pair G.703 Network

HDSL TECHNOLOGY

HDSL is the core technology for ADC’s WorldDSL line of LTUs, UTUs, and ETUs. Rate selectable HDSL enables these units to transmit and receive digital data at various rates over various distances on one twisted pair of copper wire. Both outbound and inbound signals are delivered on the same pair of wires by using echo cancellation techniques. The transmitted signal is canceled at the receiver by precisely predicting the amount of signal echo, then subtracting it from the overall input signal. ADC’s market leading HDSL-based products tolerate crosstalk, and operate not only on continuous unobstructed pairs of wires, but also on cables with mixed wire gauges and bridged taps.

TRANSMISSION RANGES

Transmission ranges assume the presence of noise according to the ETSI model described in TS 101 135. The expected Bit Error Rate (BER) using this model is 1x10-7. The transmission ranges in such a noise environment at the various HDSL line rates over one twisted-pair of 0.4 mm and 0.51 mm copper wire are listed in Table 2. The no noise transmission ranges are listed in “Specifications” on page 9.

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Table 2. Transmission Ranges with 0 db ETSI Noise

RS G.703 HDSL Payload Rate

Wire Size and Transmission Range (with 0 dB ETSI Noise)

 

 

 

 

User Selected

Actual

0.4mm (26 AWG)

0.51mm (24 AWG) Single

HDSL Payload

HDSL Payload

Single Twisted-Pair

Twisted-Pair Copper Wire

Rate (kbps)

Rate (kbps)(a)

Copper Wire

 

 

 

 

 

64/128

256

4.1 km (13,451 ft.)

5.1 km (16,730 ft.)

256

384

3.6 km (11,811 ft.)

4.7 km (15,420 ft.)

384

512

3.4 km (11,155 ft.)

4.5 km (14,760 ft.)

640

768

3.0 km (9,842 ft.)

4.2 km (13,779 ft.)

1024

1152

2.6 km (8,530 ft.)

3.4 km (11,155 ft.)

1408

1536

2.2 km (7,218 ft.)

2.9 km (9,515 ft.)

1920/1984/2048

2048(b)

2.0 km (6,562 ft.)

2.4 km (7,874 ft.)

(a)See “G.704 Framing and Rate Selectable HDSL” on page 17.

(b)System operates in unstructured mode when 32 time slots are selected.

(b) The maximum no-noise transmission range is approximately 7.1 km (4.4 miles). See “Specifications” on page 9.

UTU-701 and ETU-751 List 1

August 9, 2002

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