CN1165150C - X DSL modem with digital separator device - Google Patents
X DSL modem with digital separator device Download PDFInfo
- Publication number
- CN1165150C CN1165150C CNB021074453A CN02107445A CN1165150C CN 1165150 C CN1165150 C CN 1165150C CN B021074453 A CNB021074453 A CN B021074453A CN 02107445 A CN02107445 A CN 02107445A CN 1165150 C CN1165150 C CN 1165150C
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- Prior art keywords
- signal
- demodulator
- low
- xdsl modulator
- bypass
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- 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
- H04L5/143—Two-way operation using the same type of signal, i.e. duplex for modulated signals
-
- 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
- H04L5/02—Channels characterised by the type of signal
- H04L5/023—Multiplexing of multicarrier modulation signals
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- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Telephonic Communication Services (AREA)
Abstract
A first connection (8) for a total signal (S) has low-frequency/LF (Sn) and high-frequency/HF signal portions (Sh). There is also a second connection (2) for an LF signal portion (Sn), and a third connection (9) for an HF signal portion (Sh). A bi-directional digital splitter device (4) splits the total signal (S) into LF (Sn) and HF portions (Sh) and overlays the total signal (S) with the LF and HF signal portions. A lead-through connection (12) between first (10) and second (11) transformers has a bypass capacity (13) for transmitting signals below a preset frequency.
Description
Technical field
The present invention relates to be used for the xDSL modulator-demodulator of decoupling or stack low frequency and high frequency POTS/ISDN signal component, be specifically related to a kind of xDSL modulator-demodulator, it has and is used for first being connected of resultant signal with at least one low-frequency signal components and at least one high frequency component signal, being used for second of this at least one low-frequency signal components connects, be used for the 3rd connection of this at least one high frequency component signal and be used for that resultant signal is decomposed into low-frequency signal components and high frequency component signal and superpose low-frequency signal components and high frequency component signal to form the bi-directional digital separator of resultant signal.
Background technology
By subscriber's line (subscriber line), not only may send speech (plain old telephone service POTS) or speech/ISDN data (integrated services digital network) (this needs a finite bandwidth), and may send xDSL data (this needs high bandwidth).At the user place or between commutation period, separate voice in an xDSL modulator-demodulator/ISDN data and xDSL data also are forwarded to local telephone system or public telephone system (ISDN with it, or be forwarded to (local or public) broadband network (for example ATM) POTS).(xDSL represents ADSL, SDSL, and HDSL, VDSL or the like, so it comprises all types of modern high bit rate numeral access technologies).
DE 198 31 779 has disclosed a kind of jockey with the distributor that is used for the Asymmetrical Digital Subscriber Line transmission system, wherein provides a distributor for an ADSL transmission system.This jockey is included in an ADSL transmission unit and telephone connecting device of user side, this telephone connecting device comprises a built-in telephony connection distributor that is used for this telephone connecting device is connected to public telephone network, and this ADSL transmission unit has a built-in distributor that is used for this ADSL transmission unit is connected to public telephone network.
The desirable xDSL modulator-demodulator of Virtual network operator (telecommunications company) comprises the digital separator device that is suitable for traditional public telephone network (POTS) and Digital Telephone Network (ISDN) simultaneously.Known that digital separator device is various active and passive filter circuit.In practice, do not use active circuit usually, can't guarantee that remote power presents because supply with under the situation of failure them at voltage.Passive splitter is very complicated, and is therefore bulky and expensive.
Summary of the invention
An object of the present invention is to provide a kind of xDSL modulator-demodulator; it utilizes simple and cost-effective structure; even supply with the transmission that also can guarantee speech and signaling-information under the situation of failure at the voltage of xDSL modulator-demodulator, and even can guarantee also that at the xDSL run duration ISDN-NT's or POTS or ISDN terminal remote power presents.
Utilization realizes this purpose according to the xDSL modulator-demodulator with digital separator device of the present invention.
According to the present invention, the xDSL modulator-demodulator with digital separator device comprises that one is used for the DC component of isdn signal and the direct bypass (direct bypass) of low-frequency signal components (signaling-information).This bypass comprises an electric capacity, therefore represents a second-order low-pass filter.Supply with at voltage under the situation of failure, for example utilize a relay this capacitor decoupling.This guarantees that isdn signal is forwarded, and the institute abridged just has the low frequency component of speech/ISDN data and separating or stack of the high fdrequency component with xDSL data.
XDSL modulator-demodulator according to the present invention has and is used for first being connected of resultant signal with at least one low-frequency signal components and at least one high frequency component signal, being used for second of this at least one low-frequency signal components connects, be used for the 3rd connection of this at least one high frequency component signal, with be used for that resultant signal is decomposed into low-frequency signal components and high frequency component signal and superpose low-frequency signal components and high frequency component signal to form the bi-directional digital separator of resultant signal, it is characterized in that, first transformer that is used for first inductance coupling high that connects, second transformer that is used for second inductance coupling high that connects, and first bypass between transformer and second transformer connect, this bypass connects and comprises a shunt capacitance, and the signal that is lower than preset frequency can connect transmission by this bypass.
The decoupling of supplying with shunt capacitance under the situation of failing at voltage is preferably realized by a switch.
For impedance matching, bypass connects one the one Z filter preferably including between the bi-directional digital separator and first transformer and one the 2nd Z filter between the bi-directional digital separator and second transformer.
In a preferred embodiment of the invention, the cut-off frequency of low pass filter is 100Hz; In an alternative preferred embodiment of the present invention, the cut-off frequency of low pass filter comes down to 4kHz.
An advantage with structure of a direct bypass according to the present invention is, might send and have high-tension DC component and low frequency signal (can't send them) by digital separator device, that is, make so-called " charged business " (live line service) become possibility.And the structure of separators according to the present invention device allows the transmission of charging pulse (charge pulses).In addition, the cut-off frequency of low pass filter 50 and 100Hz between the advantage of preferred embodiment be that the possibility of the POTS voice signal being carried out digital filtering is provided.As a comparison, the cut-off frequency of low pass filter is that the advantage of the alternative preferred embodiment of about 4kHz is, can use much simple transformer.
Other features and advantages of the present invention can obtain from the explanation of following example embodiment.
Description of drawings
Fig. 1 schematically shows the embodiment according to the structure of modulator-demodulator of the present invention.
Fig. 2 shows the embodiment according to digital separator device of the present invention.
Embodiment
Fig. 1 shows the structure of the xDSL modulator-demodulator that comprises its critical piece.The outside square frame representative that xDSL modulator-demodulator 1 is drawn by solid line.It has first connection 2 that is used for a resultant signal S.Resultant signal S is made up of at least one low-frequency signal components Sn and at least one high frequency component signal Sh.Low-frequency signal components Sn appears at second of xDSL modulator-demodulator 1 and connects 8; High frequency component signal Sh appears at the 3rd of xDSL modulator-demodulator 1 and connects 9.
XDSL modulator-demodulator 1 is between the switching center of Virtual network operator and the subscriber's line or user's local call and the interface between computer system and the subscriber's line.Send speech/ISDN data and xDSL data by subscriber's line at both direction, make xDSL modulator-demodulator 1 (provisionally) among Fig. 1 as transmitter or operation of receiver.
XDSL modulator-demodulator 1 comprises a digital separator device 4.Digital separator device 4 is connected to second of xDSL modulator-demodulator 1 by the driver/ad/da converter 5 that is used for input signal and connects 8.In addition, it is connected to the 3rd connection 9 of xDSL modulator-demodulator 1 by transceiver 6.Under each situation, digital separator device 4 is connected to next stage 5 and 6 by a bidirectional port, and bidirectional port is represented with double-head arrow in Fig. 1.In the embodiment shown, the 3rd of xDSL modulator-demodulator 1 the connection 9 also is a port.
Digital separator device 4 is worked two-wayly.When xDSL modulator-demodulator 1 received data, bi-directional digital separator 4 was decomposed into low-frequency signal components Sn and high frequency component signal Sh to resultant signal S.Under the transmission situation, bi-directional digital separator 4 stack low-frequency signal components Sn and high frequency component signal Sh are to form resultant signal S.
Orientation for the input and output signal of xDSL modulator-demodulator 1 is separated, bi-directional digital separator 4 with provide one first hybrid circuit 3 between first is connected 2.Similarly, bi-directional digital separator 4 with provide one second hybrid circuit 7 between second is connected 8.
Structure at xDSL modulator-demodulator 1 has under the situation of above-mentioned parts, and power supply is supplied with failure will cause the interruption that is connected between user and the isdn network, and particularly can cause the complete failure of telephone service,, no longer send speech/ISDN data that is.
For in addition supply with at power supply under the situation of failure and guarantee that the switching center of Virtual network operator or user are connected to isdn network, according to the invention provides a bypass.Supply with at power supply under the situation of failure, bypass according to the present invention make first of xDSL modulator-demodulator 1 connect 2 with short circuit between second of xDSL modulator-demodulator 1 is connected 8.Power supply is supplied with under the situation of failure in switching center, this can guarantee to be fed to the POTS/ISDN network from connecting 8 by connecting 2 speeches/ISDN data, although do not superpose low-frequency signal components and high frequency component signal (promptly being connected the 9 xDSL data that occur).If (or side by side) located to take place power supply the user and supplied with failure on the contrary, so by second of xDSL modulator-demodulator 1 connect 8 through the xDSL modulator-demodulators 1 of outage appearing at the data forwarding that connects on 2 the isdn network local telephone network to the user.Supply with at power supply under the situation of failure, in xDSL modulator-demodulator 1, only interrupt the separation of high frequency component signal Sh from resultant signal S.
In order to realize notion of the present invention, as shown in Figure 1, being connected 2 and second with first at digital separator device 4 provides first transformer 10 and second transformer 11 respectively between connecting 8.
In the embodiment shown, first and second transformers 10 and 11 under every kind of situation comprise two primary coils and a secondary coil.In two transformers 10 and 11 two primary coils each is connected 2 and 8 by the outside that first contact is connected respectively to modulator-demodulator 1.Second contact of first primary coil of transformer 10 is connected to second contact of first primary coil of transformer 11 by first circuit of bypass connection 12.Equally, second contact of second primary coil of transformer 10 is connected to second contact of second primary coil of transformer 11 by second circuit of bypass connection 12.
Bypass connects 12 bypasses that constitute between first and second transformers 10 and 11 and presents the signal with POTS to be used for remote power.Connect 12 transmission for fear of high-frequency signal by bypass in addition, a shunt capacitance 13 is provided.Shunt capacitance 13 connects bypass and connects two circuits of 12.As a result, bypass 12 forms a second-order low-pass filter.
Otherwise, supply with under the situation of interrupting at the power supply of the xDSL of user side modulator-demodulator 1, want to connect 12 and send resultant signal S with low frequency and high fdrequency component Sn and Sh by bypass.For this reason, must make low pass filter can pass through all frequencies.For this reason, by a switch 14 shunt capacitance 13 decouplings.Only supply with diverter switch 14 under the situation of failing at voltage.
Similarly, the power supply of the xDSL modulator-demodulator 1 in the switching center of Virtual network operator is supplied with under the situation of interrupting, by shunt capacitance 13 decouplings, make the data Sn that connects 8 places without filtering and not with the situation of the data Sh stack that is connected 9 places under first connection 2 by xDSL modulator-demodulator 1 be fed in the subscriber's line.
In xDSL modulator-demodulator 1 constructed according to the invention, to transformer 10 and 11 and the selection of shunt capacitance 13 to make (low pass filter) bypass connect 12 cut-off frequency be in 50 and 100Hz between, perhaps the cut-off frequency of low pass filter is not much larger than 4kHz.The transmission path of following table 1 representative signal under POTS and " ISDN on the ADSL " (" ISDN over ADSL ") both of these case.
Table 1
| Embodiment 1 (Fg＞50Hz) | Embodiment 2 (Fg＞4kHz) | |
| POTS by bypass | Remote power is presented, ring, on-hook/off-hook | Remote power is presented, ring, and on-hook/off-hook is up to the speech of 4kHz |
| POTS by digital separating unit | Voice signal, charging pulse | |
| ISDN by bypass | Remote power is presented | Remote power is presented |
| ISDN by digital separating unit | 4B3T or 2B1Q data-signal | 4B3T or 2B1Q data-signal |
In table 1, the cut-off frequency of bypass connection 12 is represented by " Fg ".4B3T and 2B1Q are the cannonical formats of modern usage data form in the isdn network.
As can be seen from Table 1, supply with under the situation of network failure at general power supply, the shunt capacitance 13 of bypass connection 12 is disconnected, and makes that can not produce bypass with isdn signal to POTS not be connected 12 tangible low pass filter behavior, that is, all signals all connect 12 transmissions by bypass.
In order to utilize single integrated circuit to cover various pattern 4B3T, 2B1Q and POTS use two Z filters, and they provide depends on and be used for the impedance of the transmission method of frequency band separately.This will explain with reference to figure 2 below.
Fig. 2 shows the internal structure of the embodiment of bi-directional digital separator 4.
First of xDSL modulator-demodulator 1 connect 2 from the resultant signal S of isdn network analog to digital converter 15[sic by the downstream position of first hybrid circuit 3] be converted to numerical data.In first low pass filter 17, undesirable high fdrequency component is leached from data.
In the downstream of first low pass filter 17, forward the data to second output 8 of xDSL modulator-demodulator 1 by driver 5.In advance, the stacked data that connects 9 from the 3rd of xDSL modulator-demodulator 1 is added on the data of being exported by first low pass filter 17.In transceiver 6, in first high pass filter 19, anticipate from the 3rd and connect 9 data then.In first adder 21, carry out from the data of first low pass filter 17 and stack from the data of first high pass filter 19.
Similarly, connecting data that 8 signal component Sn obtains by driver/ad/da converter 5 from second of xDSL modulator-demodulator 1 is forwarded to transceiver 6 by second high pass filter 20 and is connected 9 with the 3rd of xDSL modulator-demodulator 1.And, connect the data that 8 signal component Sn obtains by driver/ad/da converter 5 from second of xDSL modulator-demodulator 1 and be output to driver/ad/da converter 3, be output to first output 2 of xDSL modulator-demodulator 1 then by second low pass filter 18 and by digital to analog converter 16.
In order to supply with at the power supply of xDSL modulator-demodulator 1 under the situation about connecting and to be connected 2 power supplys that are connected 8 places with second first and to supply with and guarantee circuit terminating under the situation of failure and do not have to reflect, in bi-directional digital separator 4, provide a Z filter 22 and the 2nd Z filter 24 according to Fig. 2.The one Z filter 22 is set at output place of the upstream end bi-directional digital separator 4 of analog to digital converter 15 or digital to analog converter 16 to hybrid circuit 3.The 2nd Z filter 24 is set directly at output place of bi-directional digital separator 4 to driver 5.The coupling of the one Z filter 22 realizes by second adder 23; The coupling of the 2nd Z filter 24 realizes by the 3rd adder 25.
The present invention can adopt known ADSL chipset, and need not to change IC.
Claims (6)
1. xDSL modulator-demodulator, have be used for one have at least one low-frequency signal components (Sn) and at least one high frequency component signal (Sh) resultant signal (S) first be connected (8), be used for second of this at least one low-frequency signal components (Sn) and connect (2), be used for the 3rd of this at least one high frequency component signal (Sh) and connect (9), with being used for resultant signal (S) is decomposed into low-frequency signal components (Sn) and high frequency component signal (Sh) and the low-frequency signal components that superposes (Sn) and high frequency component signal (Sh) to form the bi-directional digital separator (4) of resultant signal (S), it is characterized in that
First transformer (10) that is used for the inductance coupling high of first connection (8),
Be used for second connect (2) inductance coupling high second transformer (11) and
Bypass between first transformer (10) and second transformer (11) connects (12), and this bypass connects and comprises a shunt capacitance (13), and the signal that is lower than preset frequency (Fg) can connect transmission by this bypass.
2. xDSL modulator-demodulator according to claim 1 is characterized in that
Supply with the switch (14) that the situation next one of failing is used for decoupling shunt capacitance (13) at voltage.
3. xDSL modulator-demodulator according to claim 1 and 2 is characterized in that
Z filter (22) between bi-directional digital separator (4) and first transformer (10).
4. xDSL modulator-demodulator according to claim 1 and 2 is characterized in that
The 2nd Z filter (24) between bi-directional digital separator (4) and second transformer (11).
5. xDSL modulator-demodulator according to claim 1 and 2 is characterized in that
Preset frequency (Fg) is 100Hz.
6. xDSL modulator-demodulator according to claim 1 and 2 is characterized in that
Preset frequency (Fg) is 4kHz.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10112559.3 | 2001-03-15 | ||
| DE2001112559 DE10112559B4 (en) | 2001-03-15 | 2001-03-15 | xDSL modem with digital splitter device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1375985A CN1375985A (en) | 2002-10-23 |
| CN1165150C true CN1165150C (en) | 2004-09-01 |
Family
ID=7677625
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB021074453A Expired - Fee Related CN1165150C (en) | 2001-03-15 | 2002-03-15 | X DSL modem with digital separator device |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN1165150C (en) |
| DE (1) | DE10112559B4 (en) |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19611941C1 (en) * | 1996-03-26 | 1997-12-11 | Siemens Ag | Circuit arrangement for line matching and echo cancellation |
| US5889856A (en) * | 1997-05-22 | 1999-03-30 | Centillium Technology Corp. | ADSL integrated line card with digital splitter and POTS CODEC without bulky analog splitter |
| US6690677B1 (en) * | 1999-07-20 | 2004-02-10 | Serconet Ltd. | Network for telephony and data communication |
-
2001
- 2001-03-15 DE DE2001112559 patent/DE10112559B4/en not_active Expired - Fee Related
-
2002
- 2002-03-15 CN CNB021074453A patent/CN1165150C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1375985A (en) | 2002-10-23 |
| DE10112559A1 (en) | 2002-10-02 |
| DE10112559B4 (en) | 2005-04-28 |
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