WO1998043397A1 - Receiving circuit for transmission systems with copper cables - Google Patents
Receiving circuit for transmission systems with copper cables Download PDFInfo
- Publication number
- WO1998043397A1 WO1998043397A1 PCT/CH1998/000108 CH9800108W WO9843397A1 WO 1998043397 A1 WO1998043397 A1 WO 1998043397A1 CH 9800108 W CH9800108 W CH 9800108W WO 9843397 A1 WO9843397 A1 WO 9843397A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- filter
- receiving circuit
- receiving
- copper
- cable
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
- H04B1/54—Circuits using the same frequency for two directions of communication
- H04B1/58—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/14—Two-way operation using the same type of signal, i.e. duplex
- H04L5/1423—Two-way operation using the same type of signal, i.e. duplex for simultaneous baseband signals
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
- H04B1/54—Circuits using the same frequency for two directions of communication
- H04B1/58—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa
- H04B1/581—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa using a transformer
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
- H04B1/54—Circuits using the same frequency for two directions of communication
- H04B1/58—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa
- H04B1/583—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa using a bridge network
Definitions
- the present invention relates to a receiving circuit for transmission systems with copper cables according to the preamble of claim 1.
- the present invention addresses the problem of specifying measures that allow without occasional adjustments to realize 'beln transmission links for high data transfer rates with copper-, as are present in the service area of communication networks.
- copper cables of different lengths and diameters can be used for the construction of HDSL transmission links without the need to adapt further components of the transmission system to the cable properties .
- the use of commercially available components of the transmission system e.g. commercially available HDSL components
- Fig. 2 shows a possible embodiment of a filter provided for dynamic limitation
- FIG. 3a shows the basic circuit diagram of a known HDSL transmission path
- FIG. 3b shows the basic circuit diagram of an HDSL transmission path according to the invention for simplex operation
- 3c shows the basic circuit diagram of an HDSL transmission link according to the invention for duplex operation
- Fig. 4 on the frequency-dependent waveforms of the signal attenuation of two copper cables with the same length and the same line diameter.
- connection area of Telecom networks there are copper cables that differ with regard to length, insulation materials and the distance and diameter of the pairs of adapters and thus have different line properties (resistance, inductance, capacitance, derivative cover and wave resistance).
- copper cables with lengths of up to 7 km and diameters of approximately 0.4 mm to 1.4 mm are present in the connection area of communication networks.
- Fig. 1 shows the course of the attenuation distortion (attenuation curve depending on the frequency) of copper cables SL1, SL2 and SL3 with diameters of 0.4 mm, 1, 0 mm and 1.4 mm, the lengths of which are chosen such that they are in the Frequency of around 220 kHz have the same attenuation.
- the 1.4 mm cable SL1 with the same length in the entire frequency range has a lower attenuation than the 0.4 mm cable SL3, as shown in FIG. 4. It can be seen from the diagram in FIG.
- the 1.4 mm cable SL1 has a much lower attenuation in the range of lower frequencies ( ⁇ 10 4 Hz) and a significantly higher attenuation in the range of higher frequencies (> 10 5 Hz) than that 0.4 mm cable SL3.
- the 0.4 mm cable SL3 has around 10 dB greater attenuation than the 1.4 mm cable SL1.
- a signal transmitted via the 1.4 mm cable SL1 therefore has a dynamic range that is around 10 dB higher (see dynl ⁇ dyn2) than a signal transmitted via the 0.4 mm cable SL3. Even if the 1.4 mm SL1 cable were a few hundred meters shorter and had less attenuation, this could lead to problems.
- the different attenuations of the copper lines SL1, SL2, SL3 are mostly compensated in the message sink of a transmission system by a gain control, which, however, does not change the attenuation distortion.
- the line equipment or the components provided for digital signal processing must be suitable when using copper cables with a larger diameter for processing signals with greater dynamics.
- Known digital HDSL reception modules often only marginally fulfill these conditions, so that problems can occasionally arise.
- the dynamic range of transmitted and processed signals determines the resolution required for the digital part of the receiving circuit (digital / analog converter, equalizer). For the signals transmitted by the 1.4 mm cables SL1, a significantly higher dynamic reserve is required, which corresponds to zone z shown in FIG. 1.
- a filter FR is therefore provided for HDSL transmission links, by means of which the signal components in the range of lower frequencies ( ⁇ 10 4 Hz) are reduced by around 10 dB.
- the filter FR which corresponds, for example, to the RC filter shown in FIG. 2, which is constructed in a known manner with capacitors Cf and resistors Rf, preferably has an attenuation curve as shown in FIG. 1 (see the curve of line fkl) is. This shows that signals in the range up to 1000 Hz are reduced by around 10 dB by the FR filter.
- the dynamic range of the signals transmitted via the 1.4 mm cable SL1 is adapted to the dynamic range of the signals transmitted via the 0.4 mm cable SL3.
- the signal components in the lower frequency range ⁇ 10 4 Hz
- the signal components in the higher frequency range (10 4 Hz - 10 5 Hz)
- the attenuation in the low-frequency range does not exceed the value corresponding to the value of the damping maximum occurring in the higher frequency range.
- the circuit arrangement according to the invention can therefore be used for all laid copper cables SL1, ..., SL3 without inadmissibly high attenuations occurring with copper cables SL3 with a thinner diameter.
- FIG. 3a shows the basic circuit diagram of the HDSL transmission line known from COMTEC, Technical Notes from CH-Telecom, 2/1997, page 28, reduced to two (SL1 and SL2) instead of three subscriber connection cables, one with a G.703 /G.704 Interface connected line termination HDSL / LT with a network termination HDSL / NT, from which, for example, individual connection lines are routed, on which data is transmitted at transmission rates of 64 kbit / s.
- the HDSL / NT network termination like the HDSL / LT line termination, can also be provided on the output side with a G.703 / G.704 interface (2 Mbit / s).
- 3b shows the basic circuit diagram of an HDSL transmission link according to the invention for simplex operation.
- data are transmitted from a transmission unit TX in simplex mode via the subscriber connection cable SL1 to the network termination NTSX or to a filter FR provided for dynamic compensation and further to a reception unit RX.
- the data transfer takes place in the same way in the opposite direction via the subscriber connection cable SL2.
- the data transmission between line and network termination LTDX and NTDX takes place in a known manner in duplex mode via hybrid circuits GS, a filter FR serving for dynamic compensation being provided between a hybrid circuit GS and the associated receiving unit RX.
- the filter FR can also advantageously be used together with integrated receiving units RX, which may be part of a transceiver. Suitable are e.g. the blocks SK70704 / SK70707 from LEVEL ONE, which are described in the associated data sheet, "1168 kbps HDSL Data Pump Chip Set", from May 1996.
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP98906792A EP0970574A1 (en) | 1997-03-25 | 1998-03-19 | Receiving circuit for transmission systems with copper cables |
AU62883/98A AU737299B2 (en) | 1997-03-25 | 1998-03-19 | Receiving circuit for transmission systems with copper cables |
NO994688A NO994688L (en) | 1997-03-25 | 1999-09-24 | Receiver circuit for transmission systems with copper cables |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH714/97 | 1997-03-25 | ||
CH71497 | 1997-03-25 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1998043397A1 true WO1998043397A1 (en) | 1998-10-01 |
Family
ID=4193457
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/CH1998/000108 WO1998043397A1 (en) | 1997-03-25 | 1998-03-19 | Receiving circuit for transmission systems with copper cables |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0970574A1 (en) |
AU (1) | AU737299B2 (en) |
NO (1) | NO994688L (en) |
WO (1) | WO1998043397A1 (en) |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS55100716A (en) * | 1979-01-25 | 1980-07-31 | Nec Corp | Pulse equalizing amplifier circuit |
EP0124203A2 (en) * | 1983-05-02 | 1984-11-07 | Mobil Oil Corporation | Apparatus for improving the data transmission rate in a telemetry system |
-
1998
- 1998-03-19 AU AU62883/98A patent/AU737299B2/en not_active Ceased
- 1998-03-19 EP EP98906792A patent/EP0970574A1/en not_active Withdrawn
- 1998-03-19 WO PCT/CH1998/000108 patent/WO1998043397A1/en not_active Application Discontinuation
-
1999
- 1999-09-24 NO NO994688A patent/NO994688L/en unknown
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS55100716A (en) * | 1979-01-25 | 1980-07-31 | Nec Corp | Pulse equalizing amplifier circuit |
EP0124203A2 (en) * | 1983-05-02 | 1984-11-07 | Mobil Oil Corporation | Apparatus for improving the data transmission rate in a telemetry system |
Non-Patent Citations (4)
Title |
---|
HIROSHI TAKATORI ET AL.: "Low-power line equalizer for digital subscriber loop", IEEE GLOBAL TELECOMMUNICATIONS CONFERENCE 1984, 26 November 1984 (1984-11-26) - 29 November 1984 (1984-11-29), NEW YORK, US, pages 26 - 31, XP002046985 * |
MARKOVIC: "Designing frequency dependent attenuators for broadband microwave circuits", MICROWAVE JOURNAL, vol. 34, no. 5, May 1991 (1991-05-01), DEDHAM, US, pages 242 - 260, XP000235596 * |
PATENT ABSTRACTS OF JAPAN vol. 004, no. 148 (E - 030) 18 October 1980 (1980-10-18) * |
TOSHIRO SUZUKI ET AL: "A CMOS switched-capacitor variable line equalizer", IEEE JOURNAL OF SOLID-STATE CIRCUITS., vol. 18, no. 6, December 1983 (1983-12-01), NEW YORK US, pages 700 - 706, XP002046984 * |
Also Published As
Publication number | Publication date |
---|---|
NO994688D0 (en) | 1999-09-24 |
NO994688L (en) | 1999-09-24 |
AU6288398A (en) | 1998-10-20 |
EP0970574A1 (en) | 2000-01-12 |
AU737299B2 (en) | 2001-08-16 |
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