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700-701-100-02
Network Side
Exchange
Office
DTE
4 Time Slots
(256 kbps)
Figure 1. Leased Line Data Application on a Single-pair G.703 Network
HDSL T
ECHNOLOGY
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.
T
RANSMISSION
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
at the various HDSL line rates over one twisted-pair of 0.4 mm and 0.51 mm copper wire are listed in
The no noise transmission ranges are listed in
RS G.703 HDSL Payload Rate
User Selected
HDSL Payload
Rate (kbps)
64/128
256
384
640
1024
1408
1920/1984/2048
(a) See
"G.704 Framing and Rate Selectable HDSL" on page
(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
UTU-701 and ETU-751 List 1
UTU-701
(LTU)
Single Pair
HDSL loop
HDSL
Time Slots 1 through 4
+Time Slots 0 and 16
G.703
(384 kbps)
R
ANGES
"Specifications" on page
Table 2. Transmission Ranges with 0 db ETSI Noise
Wire Size and Transmission Range (with 0 dB ETSI Noise)
Actual
HDSL Payload
Single Twisted-Pair
(a)
Rate (kbps)
256
384
512
768
1152
1536
(b)
2048
Customer Side
UTU-701
(NTU)
HDSL
4 Time Slots
G.703
-7
. The transmission ranges in such a noise environment
9.
'
0.4mm (26 AWG)
Copper Wire
4.1 km (13,451 ft.)
3.6 km (11,811 ft.)
3.4 km (11,155 ft.)
3.0 km (9,842 ft.)
2.6 km (8,530 ft.)
2.2 km (7,218 ft.)
2.0 km (6,562 ft.)
17.
August 9, 2002
Customer
DTE
(256 kbps)
0.51mm (24 AWG) Single
Twisted-Pair Copper Wire
5.1 km (16,730 ft.)
4.7 km (15,420 ft.)
4.5 km (14,760 ft.)
4.2 km (13,779 ft.)
3.4 km (11,155 ft.)
2.9 km (9,515 ft.)
2.4 km (7,874 ft.)
"Specifications" on page
9.
Overview
PC
Table
2.
3
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