DE10045775A1 - Device and method for triggering the initialization procedure in high bit rate data transmission systems - Google Patents

Abstract

The present invention relates to a line module (3) for a switching center (2) for connecting subscriber lines, each with a data transmission device (7) for high bit rate data transmission and / or a telephone (4), this state when the handset of the telephone (4) is picked up detected by a first sensor (12) of the line module (3) and an initialization procedure is carried out. DOLLAR A Furthermore, the present invention relates to a data transmission device (7) for this line module (3) and a method used in these devices for triggering an initialization procedure.

Description

The present invention relates to a line module for a Exchange, a data transmission device for a personal computer and one in these devices method used to trigger a Initialization procedure in a high bit rate Data transmission system.

Modern exchanges in the electronic dialing system Digital (EWSD) are already able to participate with their end devices in addition to the analog (POTS, plain old Telephone Service) or digital (ISDN, Integrated Services Digital Network) telephone services also high bit rate data services in the xDSL transmission system (x Digital Subscriber Line). For example, in ADSL process (Asymmetric Digital Subscriber Sine) from the Exchange to the subscriber (data downstream) one Data transfer rate of up to 8 Mbit / s and in the ent opposite direction (data upstream) of up to 640 kbit / s possible.

The interface between the subscriber and the operator the agency or the telecommunications network Line module (also line card or SLMI, Subscriber Line Internet modules) in the exchange or a so-called called xDSL modem (data transmission device) as one Terminal (personal computer, PC) of the participant.

There are usually several participants on a line module connected to their end devices (e.g. telephone and PC); both services are via a physical line transferred between the exchange and the subscriber. At the The services are subscribed by a so-called  Splitter divided into data services and telephone services. The Entire devices at the participant (telephone, PC with xDSL modem and splitter) will also become customer premises Equipment (CPE) called.

The line modules described have an integrated one Voice / data chipset that allows both a transmission of Language in the PCM system (Pulse Code Modulation) via one Voice network as well as a transmission of data (e.g. in the frame Relay, Ethernet or ATM system) for packet-oriented Data transmission over a data transmission network (e.g. Internet) with high data transfer rates is possible.

Establishing the connection and data transmission in xDSL The procedure is e.g. B. in the standards G.992.1 and G.Dmt and G.992.2 or G.Lite of the International Telecommunication Union (ITU). Furthermore, for example, in the Standards G.994.1 and G.hs the handshake procedures for Established connection, where z. B. Transfer Para meter and method of the respective connection during a Initialization procedure can be set.

This includes a so-called fast retrain procedure defined with a quick initialization procedure between the subscriber's terminal (xDSL modem) and the Exchange is carried out. This initialization procedure is performed during the connection if For example, change the line properties and errors occur frequently.

The fast initialization procedure (Fast Retrain) can either from the line module or from the data transfer Carrier device (xDSL modem) of the participant triggered depending on the boundary conditions. For example, the Data transfer from the exchange to the data transfer transmission device by the data transmission device and the data transfer from the data transfer device  to the switching center monitored by the line module and open Checked errors. When a certain one is exceeded Bit error rate is determined by the respective device (data transmission device or line module) a fast Initialization procedure triggered; thereby from the corresponding device signaling messages that the Initiate, generate, and initiate the initialization procedure sent to the respective other device.

The line properties can also be more predictable Change ways, e.g. B. by picking up the handset phone; when the handset is lifted, the over carrying properties for high bit rate data transmission negatively impacted in a predictable manner.

In the state of the art, the state is defined, whether the telephone handset hangs up (on-hook state) or removed (Off-hook state) or a change in this state from the data transmission device (i.e. the xDSL modem) of the participant recognized and a quick Initialization procedure is triggered.

The disadvantage of this method, however, is that the Detection of the on / off hook condition necessary sensor in the Data transmission device of the participant very unverver is casual.

The object of the present invention is therefore a Line module according to claim 1, a Data transmission device according to claim 6 and a To provide the method according to appended claim 8, at which reliable detection of the operating state of the Phone is enabled.

This task is performed by a line module for an operator agency according to the appended claim 1, a data transfer Carrying device for a personal computer according to the  appended claim 6, and by one in these devices method used to trigger a Initialization procedure according to appended claim 8 solved.

The present invention is based on the fact that the Detection of the operating states of the phone essential more reliable thanks to an integrated in the line module first sensor in the exchange than through the second Sensor of the subscriber's data transmission device can be carried out, however, when triggering the Initialization by the line module of the sensor (second Sensor) are bypassed in the data transmission device, which also recognizes the operating states.

According to the invention, the initialization in the event of a change the operating status of the subscriber's phone the line module and not, as in the prior art, triggered by the data processing device.

Advantageous refinements of the present invention are reproduced in the respective subclaims.

According to the present invention, the operating state "On-hook" and / or "off-hook" (so-called on- and / or off-hook state) or a change thereof Operating status recognized.

According to the invention, two options are available for carrying out the initialization procedure when this operating state changes:
The first possibility is that all signaling messages sent by the data transmission device to the exchange for triggering an initialization procedure are ignored by the line module.

The advantage of this solution is that it is particularly simple Feasibility; the present invention must be single Lich implemented in the line module. Problems arise, however, if the line properties (regardless of lifting the handset) for the data transfer transfer from the exchange to the subscriber (data down stream) adversely change; one then through the data Transmission device initiated initialization procedure is also ignored by the line module.

The second option is that the line module a command in the form of signaling messages to the data transmission device of the subscriber, whereupon the Sensor in the data transmission device (second sensor), the operating state "handset off hook / on hook" or detects a change in this operating state, deactivated becomes. The advantage of this solution is that targeted Requirements for initialization procedures through trigger this unreliable second sensor can be prevented.

Deactivating the second sensor according to the invention in the Data transmission device that has the on / off hook state recognizes and accordingly a short initialization procedure triggers, is advantageously during a Initialization procedure deactivated, which at Connection establishment of each connection to the high bit rate Data transfer is carried out by definition.

The command required for this (in the form of a signaling dung) can, for example, during the initial handshake procedure according to ITU standard G.994.1 (G.hs) are transmitted in the reason additional transmission parameters can be defined.

Another way to disable the command To transmit sensors is the use of unused  Bits in the so-called C-MsgX signaling message. This The signaling message is sent after the handshake procedure carry and contains other features that the data transmission affect.

The present invention is preferably applied to xDSL transmission systems such as B. ADSL and UDSL.

The present invention will hereinafter be more preferred based on Embodiments with reference to the accompanying Drawings explained in more detail, in which:

Fig. 1 shows the schematic structure for high bit rate data transmission between the terminals of a subscriber and the exchange, and

Fig. 2 shows the schematic structure of the line module according to the invention and the data transmission device according to the invention.

As can be seen from FIG. 1, the switching center (Central Office, CO) contains two, among other things, one or more line modules 3 a. , , 3 n for connecting the subscribers or their terminals (customer premises equipment, CPE) 1 to the exchange 2 . The line modules 3 a. , , 3 n provide subscribers 1 with both conventional telephone services (POTS or ISDN) and high-bit-rate data services (such as ADSL, UDSL).

The participants 1 have various end devices, such as a telephone 4 and a personal computer 5 (PC) with an xDSL modem (data transmission device) for using the services offered; the data transmission device can be connected internally to the PC or externally to the PC. The services offered are divided in the subscriber 1 by a so-called splitter 6 onto the respective devices (PC, telephone).

The splitter 6 is provided, for example, in the recommendation G.dmt. In the G.lite recommendation, for example, there is no such splitter; There, separate filters (high pass, low pass) are provided for the distribution of the services for the respective end devices (telephone, PC) (so-called distributed splitter).

In the exchange 2 , the services offered by the line modules 3 a. , , 3 n divided over the respective transmission networks (also by a splitter). So voice data z. B. in the PCM process over the voice network and the high bit rate data transmission takes place via its own interface, the z. B. is connected to the Internet.

The method according to the invention for carrying out a short initialization procedure is explained in more detail below with reference to FIG. 2.

In the prior art, the second sensor 8 detects in the data transmission device 7 during the connection to the high bit rate data transmission when the handset of the telephone 4 is picked up. Picking up the handset, ie establishing a connection for the transmission of speech with the exchange, has a negative effect on the line properties, ie the transmission capacity is reduced. Thus, when this operating state is recognized by the second sensor 8, signaling messages, which signal the initiation of a rapid initialization procedure, are sent to the line module 3 to which the subscriber's terminals 1 are connected. The line module 3 receives these signaling messages and uses the initialization device 11 together with the data transmission device 7 to carry out a quick initialization procedure in which essentially the line properties are newly determined.

However, since the second sensor 8 integrated in the data transmission device 7 is very unreliable, it is recognized according to the present invention by a first sensor 12 integrated in the line module 3 whether the handset of the telephone 4 is picked up (off-hook state). For this purpose, the second sensor 8 must be bypassed, so that a quick initialization procedure is not incorrectly carried out or not carried out.

For this purpose, according to the present invention, either initiation of an initialization procedure by the data transmission device 7 is ignored by the initialization device 11 or the second sensor 8 is deactivated by the signaling device 10 generated by the signaling device 10 .

Ignoring the signaling messages sent by the data processing device 7 to trigger an initialization procedure according to the invention has the advantage that the implementation is much easier; it only takes place in the line module 3 .

The deactivation of the second sensor 8 according to the invention has the advantage that the initiation procedure is not fundamentally prevented by the data transmission device 7 . B. continue to react to changes in line properties. However, this embodiment of the invention requires an implementation both in the data transmission device 7 and in the line module 3 .

It should be noted that elements required for data transmission in the line module 3 and in the data transmission device 7 , such as. B. processors, modulators, demodulators, power supply, etc. are not shown, since they are not part of the subject of the present invention.

Claims (12)

1. Line module ( 3 ) for a switching center ( 2 ) for connecting subscriber lines, each with a data transmission device ( 7 ) for high-bit data transmission and / or a telephone ( 4 ) of a subscriber ( 1 ) to a telecommunications network, with
an initialization device ( 11 ) for carrying out an initialization procedure for determining transmission parameters of the data transmission with a connected data transmission device ( 7 ) of a subscriber, and
a first sensor ( 12 ) for detecting the operating state of a connected telephone ( 4 ) of this subscriber,
wherein the initialization device ( 11 ) triggers an initialization procedure when the first sensor ( 12 ) detects a change in the operating state of the telephone ( 4 ). 2. Line module ( 3 ) according to claim 1, characterized in that the first sensor ( 12 ) detects a change in the operating state when the handset of the telephone ( 4 ) is picked up and / or hung up. 3. Line module ( 3 ) according to claim 1 or 2, characterized by a signaling device ( 10 ) for generating signaling messages for deactivating a second sensor ( 8 ) in the data transmission device ( 7 ) for detecting a change in the operating state, whether the listener Telephone ( 4 ) is removed and / or hung up, is provided and for sending the signaling messages to the data transmission device ( 7 ). 4. Line module ( 3 ) according to claim 3, characterized in that the signaling device ( 10 ) sends the signaling messages during an initialization procedure when establishing a connection for high bit rate data transmission to the data transmission device ( 7 ). 5. Line module ( 3 ) according to claim 1 or 2, characterized in that the initialization device ( 11 ) from the data transmission device ( 7 ) ignores received signaling messages to trigger an initialization procedure. 6. Data transmission device ( 7 ) for a personal computer ( 5 ) of a subscriber ( 1 ) for high bit rate data transmission between the personal computer ( 5 ) and an exchange ( 2 ), wherein a subscriber can have a personal computer ( 5 ) and a telephone ( 4 ) connected to a switching center ( 2 ) via a subscriber line
a second sensor ( 8 ) for recognizing whether the handset of a subscriber's telephone ( 4 ) is picked up or on-hook, a signaling message for triggering an initialization procedure being sent to a line module ( 3 ) in the exchange ( 2 ) when the handset is picked up,
marked by
a receiving device ( 9 ) for receiving signaling messages from the line module ( 3 ) which contain information for deactivating the second sensor ( 8 ), wherein
the second sensor ( 8 ) is deactivated on the basis of the signaling messages received. 7. Data transmission device ( 7 ) according to claim 6, characterized in that the receiving device ( 9 ) receives the signaling messages during an initialization procedure when establishing a connection for high bit rate data transmission from the switching center ( 2 ). 8. Method for triggering an initialization procedure for high-bit-rate data transmission between a line module ( 3 ) in a switching center ( 2 ) and a data transmission device ( 7 ) of a subscriber ( 1 ), each with a data transmission device ( 7 ) and / or a telephone ( 4 ) of a subscriber is connected to a switching center ( 2 ) via a subscriber line and an initialization procedure for determining transmission parameters is triggered by the line module ( 3 ) if a change is made if the operating state of a telephone ( 4 ) of this subscriber is changed by the line module ( 3 ) is recognized. 9. The method according to claim 8, characterized in that a change in the operating state is detected when the handset of the telephone ( 4 ) is picked up and / or hung up. 10. The method according to claim 8 or 9, characterized in
that the data transmission device ( 7 ) also recognizes the operating state, whether the handset of the telephone ( 4 ) is off-hook or on-hook, and
Signaling messages which contain information for deactivating the second sensor ( 8 ) are generated by the line module ( 3 ),
Signaling messages are sent to the data transmission device ( 7 ),
the signaling messages are received by the data transmission device, and
the second sensor ( 8 ) is deactivated on the basis of the signaling messages received. 11. The method according to claim 10, characterized by sending the signaling messages during an initialization procedure when establishing the connection for high bit rate data transmission to the data transmission device ( 7 ). 12. The method according to claim 8, characterized by ignoring signaling messages received from the data transmission device ( 7 ) for triggering the initialization procedure.