CN85106540B - The system that is used for the Control Network boot sequence - Google Patents

Abstract

A kind of by terminal equipment, connect the network terminal of a plurality of terminal equipments and the Digital Subscriber Line Control Network that exchange termination is formed.Under the wait state of this Digital Subscriber Line, the network terminal is under the state that can only receive a signal.In terminal equipment was called out, when the network terminal is received a line enabling signal from switching equipment, and under the input state of exchange termination, when the network terminal received a line enabling signal from switching equipment, the transmission of the network terminal partly was driven.Send synchronous mode signal by sending part to exchange termination, exchange termination is set up synchronously.

Description

The system that is used for the Control Network boot sequence

The present invention relates to the system of a Control Network boot sequence in Integrated Service Digital Network, particularly the system of Control Network boot sequence between a network terminal and exchange termination.

In the information and communication system in future, need to handle more diversified information one and comprise sound, data, image and out of Memory.In order to handle these diversified day by day information, a network comprehensive various as far as possible telecommunications service of will having to.In addition, must consider in multiple Communications service the common use or the like of transmission switching equipment.Therefore, in order to realize a kind of integrated network that transmission system is combined by digital technology with switching system, carrying out research work.

In the normal structure of isdn user's line of an integrated network, resembling the such terminal equipment of telephone set or data terminal is to be connected on the exchange termination by a network terminal.

In such network, the transmission line between the transmission line between the terminal equipment and the network terminal and the network terminal and the exchange termination provides the transmission line physically between network one side and user's one side, is known as " physical layer ".

Transmission line the free time, promptly wait to be used in, be changed to the state that withdraws from startup.This mainly is in order to reduce power consumption as much as possible.Therefore, in order to carry out actual communication between network one side and user's one side, transmission line must switch to starting state from the state that withdraws from startup.

Consultative Committee on International Telephone and Telegraph (CCITT) (CCITT) is being that final goal is carried out research work with regulation S/T point in this normal structure just, that is, and and the burst of private user line between the prescribed terminal equipment and the network terminal only.It does not plan promptly between the network terminal and the exchange termination, to stipulate at the U point.As for the boot sequence that S/T is ordered, CCITT is preparing to propose some special suggestion, and this will mention afterwards.

In addition, in above-mentioned network, what the digital subscriber transmission system was adopted is two-wire timesharing transmission system (so-called " table tennis " transmission system).In two-wire timesharing transmission system, two-wire is used to connect the network terminal and exchange termination, so that the transmission and the reception of the digital signal that can hocket in the mode of train of signal.

NTU is provided respectively in the exchange termination and the network terminal.The signal that provides in NTU receives equalizer, and its incoming level was set before message transmission, made exchange termination one side and the network terminal one side all be placed in the state of optimum reception level like this.This is to finish by the training mode that transmits between the network terminal and exchange termination.When the network terminal one side is set the equalizer incoming level, normally send a training mode from being in not exchange termination one side of communication state, the NTU of the network terminal one side receives this training mode to set the incoming level of its equalizer.So the network terminal one side remains on synchronous regime constantly.

In this case, the NTU of the network terminal one side does not send any signal fully on transmission line.On the other hand, when the NTU of the network terminal one side is started by exchange termination one side, when perhaps this device was started by the network terminal one side, it sent training mode, made the reception equalizer in the NTU of exchange termination one side that incoming level is set by this training mode.After the equalizer incoming level of exchange termination one side and the network terminal one side was all set, exchange termination one side and the network terminal one side were just reached synchronously and communication can be carried out.

At this moment, when the equalizer incoming level in the NTU of the network terminal one side when setting from the training mode of exchange terminal one side, in the reception equalizer of exchange termination one side,, therefore can not carry out the setting of incoming level not from the input signal of transmission line.Yet actually, input signal can be owing to a variety of causes is applied on the reception equalizer of NTU of exchange termination one side.That is: in the table tennis transmission system, transmission line uses by time-sharing format, transmits and receive by the information transmission cycle to switch.Produce noise when at this moment, switching in transmission and between receiving.In addition, training mode can be leaked by a transformer, and this transformer is connected to transmitting terminal in the NTU and receiving terminal on the transmission line, and like this, the incoming level that exchange termination one side joint is received equalizer promptly is set in undesirable mode.

Because these signals all are high level usually, therefore, if the equalizer incoming level of exchange termination one side is according to these signal sets, so when exchange termination one side be that the enabling signal of origin automatic network terminal and training mode is set up when synchronous, will have problems, promptly exchange termination can not receive from the network terminal one side, be transmitted line attenuation signal.

In order to address this problem, the conventional practice is that the NTU of the network terminal one side is powered by exchange termination one side, and before the enabling signal that is used for exchange termination one side, the network terminal one side forms a DC loop.By detecting this loop, exchange termination one side receives equalizer and is set to initial condition, and receives the training mode that is sent by the network terminal subsequently, like this, has promptly set the incoming level that receives equalizer in the NTU of exchange termination one side.

Yet a kind of like this system is that the power supply with the network terminal one side is provided as prerequisite by exchange termination one side.When the power supply of the NTU of the network terminal one side is when providing between device, DC loop above-mentioned does not just exist, so can't carry out the initial setting up that exchange termination one side joint is received equalizer.Therefore, the incoming level of exchange termination one side joint receipts equalizer can not correctly be set by the training mode from the network terminal.

An object of the present invention is to provide the system of a Control Network boot sequence on isdn user's line, wherein, expand in proper order on the whole network between terminal equipment and the exchange termination by the terminal equipment of CCITT suggestion and the network startup between the network terminal.

A basic purpose of the present invention provides the system that is used for the Control Network boot sequence that can reduce power consumption on isdn user's line.

Further aim of the present invention provides a system, and in this system, even the electric current of the network terminal one side is supplied with between multiple arrangement, exchange termination one side also can be carried out initial setting up, can correctly set the incoming level of exchange termination then.

Above-mentioned purpose can realize by the control system that is provided for network startup order on Digital Subscriber Line, this Digital Subscriber Line by terminal equipment, comprise the network control unit of a plurality of terminal equipments, and an exchange termination constitutes.In the wait state of Digital Subscriber Line, network control unit is in the state that can only receive a signal, in the time that terminal equipment is called out.When terminal control mechanism is received line enabling signal from switching equipment, and be at exchange termination under the situation of input state, when terminal control mechanism was received line enabling signal from switching equipment, the transmission part of network control unit promptly was activated.Then, send synchronous mode signal to exchange termination, set up the synchronous of exchange termination with this by sending part.

The present invention further feature and advantage will show from the explanation of doing below with reference to accompanying drawing, and still, scope of the present invention never is limited.

Fig. 1 is a schematic diagram, shows the basic configuration of user terminal;

Fig. 2 is a schematic diagram, and a subscribers feeder in ISDN has been described;

The schematic diagram of Fig. 3 A to 3D has illustrated by the terminal equipment in ISDN of CCITT suggestion and the job order between the network terminal;

Fig. 4 is a schematic diagram, shows an example of conventional system;

Fig. 5 is a schematic diagram, shows an example of the present invention;

Fig. 6 A to 6B is a schematic diagram, and the startup and the state that withdraws from startup of subscribers feeder have been described respectively;

Fig. 7 A is the structural representation of subscribers feeder, and Fig. 7 B is the structural representation of the exchange termination shown in Fig. 7 A;

Fig. 8 A and 8B are schematic diagrames, and the startup of line according to the present invention has been described;

Fig. 9 A, 9B and 9C are schematic diagrames, have illustrated according to the present invention to make line withdraw from startup;

Figure 10 A and 10B are schematic diagrames, have illustrated according to an accurate boot sequence of the present invention;

Figure 11 A and 11B are schematic diagrames, and the policer operation to carrying out synchronously in the present invention has been described;

Figure 12 is a schematic diagram, and a table tennis transmission system has been described;

Figure 13 is the structural representation of the exchange termination one side network terminal;

Figure 14 A and 14B are that exchange termination one side is set up the schematic diagram that concerns between signal and the initial setting up signal synchronously;

Figure 15 is the schematic diagram of an object lesson of synchronizing detection circuit;

Figure 16 is the schematic diagram of an object lesson of block transfer control circuit;

Figure 17 is the schematic diagram of an object lesson of equalizer control circuit;

Figure 18 is the schematic diagram of an example of data format in the system of the present invention;

Figure 19 illustrates the working timing figure of setting up in the present invention when synchronous; With

Figure 20 is at the sequential chart of not setting up illustrative system operation when synchronous.

Fig. 1 has shown the basic configuration of user terminal.In Fig. 1, exchange termination of 1 expression, 2 is network-termination devices.3a is a facsimile machine, and 3b is a data terminal, and 3c is a telex terminal, 3d is user's intelligence telegram (teletex) terminal, and 3e is a portable terminal, and 3f is a picture-phone, 4a to 4d is a terminal adapter, the 5th, and digital telephone (terminal control device).

The standard of S/T reference point gives perfect regulation by CCITT.In main manufacturing firm, user terminal is being carried out development widely, comprise digital telephone 5 and other multi-purpose terminal 3a to 3f, comprise terminal adapter 4a to 4d, network-termination device 2 provides the port connection for a digital subscriber industrial siding, several terminals can be connected, but work more than two terminals must not be arranged at synchronization.

Fig. 2 has shown the subscribers feeder among the ISDN.Here, the terminal equipment and the network terminal are to purchase in a private home.

As previously mentioned, CCITT carries out effort for proposing a suggested design that realize to start and withdraw from startup with specific method.Its specified boot sequence is shown in Fig. 3 A and 3B, and the order that withdraws from startup is shown in Fig. 3 C and 3D.That is, when starting, have different situations, by terminal equipment the startup request is proposed as shown in Figure 3A and shown in Fig. 3 B by main equipment, promptly switching equipment proposes the startup request.When withdrawing from startup, also there is different situations, shown in Fig. 3 C, propose to withdraw from the startup request and shown in Fig. 3 D, propose the startup request by main equipment by terminal equipment.

These situations will be in following explanation.

(a) start by terminal equipment one side

When proposing the physical start-up request in the terminal equipment, as shown in Fig. 3 A, this terminal equipment TE is to network terminal NT output signal info1.Network terminal NT receives this signal and sends signal info2.Terminal equipment TE sends info5 again.Make network terminal NT loopback info4 by it.This terminal equipment TE receives that info4 just orders startup.In this way, before carrying out, call request just started necessary terminal equipment.

(b) start by main equipment one side

When exchange termination one side proposed the startup request, as shown in Fig. 3 B, the network terminal was exported a signal info2.Terminal equipment receives this signal and exports info5.The network terminal sends info4 according to info5.Similar with above (a), and instruction starts.In this manner, before carrying out reception, started necessary terminal equipment.

(c) withdraw from startup by terminal equipment one side

When terminal equipment one side proposition physics withdrawed from the startup request, shown in Fig. 3 C, this terminal equipment was to network terminal output signal info0, and the network terminal receives this signal and info0 of loopback.Instruction physics withdrawed from startup after terminal equipment was received the info0 of loopback.By this way, Bi Yao terminal equipment is turned back to by starting state and withdraws from starting state.

(d) withdraw from startup by main equipment one side

When exchange termination one side proposes the startup request, as shown in Fig. 3 D, the network terminal one side output info0.According to this signal, terminal equipment instruction physics withdraws from startup, simultaneously to the network terminal one side loopback info0.

In the present invention, in order to export above-mentioned signal info0,1,2,4,5, be to the point of the U between the network terminal and exchange termination output operation signal as shown in table 1.

The S/T point	The operation signal that U is ordered	Implication	Direction
				info0	POFF or DACT	Start from exchange termination, or starting state is withdrawed from expression	NTTE→ET
info1	PON	Start from terminal equipment	NTTE→ET
								info2	EQR	Equalizer is ready to (synchronous regime) in the exchange termination	NTTE←ET
info4	ETR	Exchange termination is ready to	NTTE←ET
				info5	TER	Terminal equipment is ready to	NTTE→ET
	ACT	Start from exchange termination, this signal specifies in the U point	NT→ET

Therefore, the invention provides the startup at U point place as shown in Figure 2 and withdraw from the control system of boot sequence.This is not included in the suggested design of CCITT in proper order, and can handle according to the producer's the authority and the policy of national governmental agencies.

Fig. 4 is the schematic diagram of a conventional system.In Fig. 4, transmission has the idle condition of flag bit between the network terminal 2 and the exchange termination 1.Setting up by flag bit synchronously between the network terminal 2 and the exchange termination 1.Therefore, in the system of routine, between the exchange termination 1 and the network terminal 2, must exist to have the idle condition of sign.

But, in the present invention, as shown in Figure 5, receive only a clock signal from exchange termination 1 at the network terminal 2 places.When request started, exchange termination 1 sent a training mode that has flag bit to the network terminal 2, as shown in Figure 6A.After the network terminal 2 was received training mode, the network terminal 2 sent a pattern to exchange termination 1, and shown in Fig. 6 B, in Fig. 6 A, the driver among the network terminal NT is in closed condition usually when request does not start, and this point is a feature of the present invention.

Transmission line state of the present invention below will be described.

(1) normal boot sequence

Withdrawing under the state of startup, training mode is to export to the network terminal from exchange termination at U point place.But, do not have pulse to be sent to exchange termination from the network terminal.In addition, there is not pulse to be sent to S/T point place by the network terminal or terminal equipment yet.

1.-a is from the boot sequence of terminal equipment

Fig. 8 A has shown the boot sequence from terminal equipment.Terminal equipment TE sends info1 as the physical start-up request to network terminal NT.When network terminal NT after terminal equipment TE receives this info1, just send a training mode PON to exchange termination ET.After exchange termination ET receives and all sets up from the training of the training mode of the network terminal and equalizer and frame synchronization, to network terminal NT backhaul signals EQR=1 and ACT=1.This signal is notified terminal equipment by the network terminal with signal info2.EQR=1 and info2 mean that the receiving terminal of network one side set up synchronously.When terminal equipment TE receives info2 and its frame synchronization when having set up, it sends the common data pattern of info5().This signal is notified exchange termination by network terminal NT with signal TER=1.After exchange termination receives TER=1, promptly enter starting state, and notify terminal equipment TE with signal ETR=1 and info4, thereby terminal equipment can be communicated by letter with main equipment by network terminal NT.

1.-b is from the boot sequence of exchange termination

Fig. 8 B has shown the boot sequence from exchange termination, and exchange termination sends signal ACT=1 as starting request to the network terminal.This ACT=1 is a training mode.After the network terminal detects this ACT=1, just send a training mode PON to exchange termination.By training mode exchange termination one side is finished after equalizer training and the frame synchronization, in order subsequently, exchange termination is sent EQR=1 to the network terminal, and as the situation among 1. above-mentioned-a, the network terminal sends the info2 signal to terminal equipment.When terminal equipment is received info2 and set up frame synchronization, just send this signal of info5 and send to exchange termination as signal TER=1 by the network terminal.After exchange termination receives TER=1, just enter starting state and notify terminal equipment with signal ETR=1 and info4 by the network terminal, terminal equipment is started also can communicate by letter with main equipment.

(2) withdraw from boot sequence normally

2.-a withdraws from the order of startup from terminal equipment

Shown in Fig. 9 A, to start be when terminal equipment is filed a request when withdrawing from, and it sends the info0 signal to the network terminal, and the network terminal is notified exchange termination with DACT=1.It is not training mode that exchange termination sends ACT=0(to the network terminal).After the network terminal is received this signal, send info0 and send POFF to terminal equipment to exchange termination, make it stop to send pulse.Like this, S/T point and U point all enter the state that withdraws from startup.At this moment, the startup of withdrawing from that begins from terminal equipment does not promptly reintroduce, even but still propose, also will be undertaken by the order shown in Fig. 9 A.

2.-b withdraws from the order of startup from exchange termination

Shown in Fig. 9 B, exchange termination sends ACT=0 to the network terminal and starts request as withdrawing from.After the network terminal receives this signal, send the info0(no pulse to terminal equipment) and send the signal POFF of stop pulse transmission to exchange termination.Consequently, lose the frame synchronization of U point interface, and send training mode EQR=0 to the network terminal at exchange termination.By such work, S/T point and U point all enter the state that withdraws from startup.

2.-c withdraws from startup owing to wrong

Under starting state, when causing synchronously for a certain reason, the physical layer of exchange termination will to the network terminal send a training mode (ACT=0, EQR=0) and enter the state that withdraws from startup, as shown in Fig. 9 C.At this moment, send the primary signal " physical error indication " of the reason of indication physical error to layer 2.

(3) at the accurate normal sequence of waiting under the TER=1 situation

In this state, the network terminal and exchange termination are synchronous at the U point, therefore can transmit general data.But at S/T point place, do not set up synchronously, the S/T point is to be in the synchronous state of waiting for like this.

3.-a waits for TER=1 and synchronously the time

As shown in Figure 10 A, exchange termination is sent the ACT=1(training mode to the network terminal) as starting request.The network terminal is sent training mode PON this is responded.By this training mode PON, finish equalizer training and frame synchronization in exchange termination one side.With EQR=1 sending network terminal, and send info2 to terminal equipment.So far, process with 1.-identical among the b.After the setting up synchronously of S/T point place, as shown in Figure 8, terminal equipment sends info5 to the network terminal.Thus, the network terminal mails to exchange termination with TER=1, and exchange termination one side is being waited for the transmission of TER=1.After exchange termination received TER=1, it was to network terminal loopback ETR=1 and enter starting state.

But when S/T point place can not set up when synchronous, the network terminal does not send ETR=1 to exchange termination one side.Therefore, after the timing of timer has surpassed preset time, still can not send under the situation of ETR=1, exchange termination one side is promptly judged synchronously and can't be set up, just send ACT=0 and EQR=0(training mode to the network terminal), enter the state that withdraws from startup, and send " physical error indication " signal to layer 2.In addition, the network terminal receives ACT=0 and EQR=0 at this moment and sends info0 to terminal equipment immediately.So that entering, it withdraws from starting state.

3.-b receives " physics withdraws from and starts request " primary signal from layer 2 when waiting for TER=1.

Shown in Figure 10 B, when exchange termination sends EQR=1 and waits for and to show when setting up synchronous backhaul signals TER=1 to the network terminal, if because, for example layer 2 such as abandons midway at reason, it receives " physics withdraws from and starts request " primary signal that layer 2 sends, and then exchange termination sends ACT=0 to the network terminal.

(be not send training mode) and wait for from the signal POFF(of the network terminal because pulse-off and asynchronous).

3.-c receives the DACT=1 from the network terminal when waiting for TER=1

As mentioned above, when exchange termination during just at awaiting acknowledgement signal TER=1, if exchange termination from the DACT=1(of the network terminal is for example received, when terminal equipment operation is abandoned midway) shown in Fig. 9 A, it sends ACT=0(to the network terminal and does not send training mode) and wait for POFF(because pulse-off and asynchronous).

At this moment, monitor that by timer TER=1 is finished by physical layer.Finishing by layer 2 to the time monitoring of " physical start-up indication " in the physical layer from " physical start-up request ".

(4) from the wait state of the POFF of the network terminal

When exchange termination is being waited for POFF(pulse-off from the network terminal) time, exchange termination sends signal ACT=0 and EQR=1 and waits for the pulse of its network terminal to stop to send (that is pulse-off) to the network terminal.This state is to enter to withdraw from a preceding transition state of starting state.

If system does not just enter through this state and withdraws from starting state, it can not be distinguished with the starting state once more from terminal equipment so, and state may vibrate.

Following process is to carry out under this state.When exchange termination detects because from the POFF(pulse-off of the network terminal) during the lock-out that causes, it sends a training mode EQR=0 and enter to the network terminal withdraws from starting state.At this moment, exchange termination will " physics withdraws from and starts indication " notice layer 2.Order in this case is shown in Fig. 9 A, 9B and 9C.

(5) the synchronous order of monitoring

As mentioned above, the physical layer of exchange termination is waited for different states, and the transmission state that U is ordered under these states provides in table 2.Here the synchronous order of the monitoring of mentioning is applicable to following state, that is, and and " waiting for TER " and " startup ".This should set up synchronous state just.In table 2, those that drawn together with bracket still, then are the values that sends to be got up by bracket sending the limit with to receive the limit irrelevant.

After detecting lock-out under the state of mentioning in the above, just carry out following process according to the order shown in Figure 11 A.

At first, the equalizer of exchange termination resets, and then, sends training mode to the network terminal.At this moment, the signal that should send out is in this state sent in the ACT position.(in fact, waiting under TER and the starting state that ACT=1 is all arranged).Subsequently, the zero setting of counter (not shown), timer T199 startup also enters monitor state.

Under monitor state, shown in Figure 11 A, rebuliding when synchronous, timer T199 stops.Stop to send training mode then and begin to send the general data pattern (ACT=1 at this moment, EQR=1, ETR=0/1).Like this, promptly turned back to normal state.

At this moment, under monitor state, after past stipulated time by timer T199 decision, the equalizer of exchange termination resets, shown in Figure 11 B.Then, the counter (not shown) adds one, and timer T199 restarts, and enters monitor state once more.After past stipulated time by timer T199 decision, repeat once this function at every turn.When the number of times that has repeated regulation and after calculator overflows, just enter and withdraw from starting state.This situation is by " physical error indication " notice layer 2.ACT=0 exports to the network terminal, so that enter the state that withdraws from startup, shown in Fig. 9 c.

Under monitor state, lose synchronously at the S/T point, therefore, it is invalid fully that this becomes the operative position that receives from the network terminal.

Fig. 7 A is the structural representation about subscribers feeder one side, and Fig. 7 B is the structural representation of relevant exchange termination one side.

In Fig. 7 A, the 1st, exchange termination; The 2nd, the network terminal, comprising control section 2-1, be used for to exchange termination one side transmit signal and differentiate the signal that receives exchange termination one side interface section 2-2 and be used for transmitting the interface section 2-3 of terminal equipment one side of signals and the signal that differentiation received to terminal equipment one side 3; The 3rd, terminal equipment comprising control section 3-1, is used to receive from the signal of network terminal 2-side and the receiving unit 3-2 that simultaneously this signal is deciphered and the transmission of the signal output that is used for sending to the network terminal 2 3-3 partly.

As shown in Fig. 7 B, exchange termination 1 is furnished with 10, one microprocessors 11 of a transformer, 13, one network ports 14 of 12, one reception buffers of a transmission buffer, a decoder 17, this decoder carry out decoding in case from coded data acquired information, an operative position detection circuit 18.Operation signal or lock-out signal that this detector identification and detection network terminal send, as shown in Fig. 7 B, the above-mentioned operation signal that should send to the network terminal of operative position output 21 outputs, 22 pairs of encoders receive the received signal (data) of coming from main equipment and carry out code conversion, Zone bit circuit 23 is used to export the sign of the burst stem that joins transmission, combinational circuit 24 will indicate, operation signal, and coded data is combined as a transmission sequence, the bipolar change-over circuit of one pole 25 is converted to bipolar signal, drive circuit 26 or the like with unipolar signal.In addition, include a timer (not shown) in the microprocessor 11.Moreover these microprocessor 11 identifications " physical start-up request " and " physics withdraws from and starts request " and output " physical error indication " or identification are by the synchronous signal of foundation of operative position detector 18 transmission.

Below, by embodiment work of the present invention is described with reference to figure 8A and Fig. 9 B.

(1) carries out boot sequence from terminal equipment

In Fig. 7 A, from terminal equipment 3 execution startups the time, control section 3-1 control sends part 3-3 so that send signal info1 to the network terminal, then sending part branch transmission info1.The interface section 2-3 of terminal equipment one side of the network terminal 2 receives this info1 and sends control section 2-1 to its decoding and with it.After control section 2-1 received this info1, this control section 2-1 work sent by main interface part 2-2 training mode PON like this to exchange termination.By this method, main interface part 2-2 sends to exchange termination.By this method, main interface part 2-2 sends training mode PON.When exchange termination receives this training mode PON by transformer 10, this signal is sent to operative position detector 18 by Network Termination #1 4.When by above-mentioned PON after the network terminal has been finished training and frame synchronization, operative position detector 18 notice microprocessors 11 have detected PON, this is a kind of operation signal.By doing like this, microprocessor 11 is to operative position output 21 output ACT=1 and to status signal circuit 23 output identification positions.They make up in combinational circuit.The output of combination is by the bipolar change-over circuit 25 of one pole, driver 26 and transformer 10 outputs.

The network terminal 2 receives the ACT=1 and the EQR=1 that send from main interface part 2-2 and deciphers simultaneously, and transmits the backhaul signals of ACT=1 and EQR=1 to control section 2-1.Then, the interface 2-3 of control section 2-1 control terminal one side is so that output info2.Then, the interface section 2-3 of terminal equipment one side sends info2 to terminal equipment 3.

In terminal equipment 3, receiving unit 3-2 receives info2 and decoding, with its notice control section 3-1.After frame synchronization was set up, receiving unit 3-2 control sent part 3-3 so that send info5.Subsequently, send part 3-3 and send info5.

When the interface section 2-3 of terminal equipment one side of the network terminal 2 receives info5 and decoding, notify control section 2-1 simultaneously, this control section 2-1 control main interface part 2-2 is so that send TER=1.

The TER=1 of Fa Songing is received by exchange termination 1 like this, as situation above-mentioned.Operative position detector 18 is confirmed the TER=1 signal, and will be to the affirmation notice microprocessor 11 of TER=1, then, exchange termination 1 places starting state, microprocessor is by operative position output 21 output ETR=1 and by status signal circuit 23 output identifications, and send signal, situation as previously discussed to the network terminal 2.

The main interface part 2-2 of the network terminal 2 receives above-mentioned ETR=1 and decoding, simultaneously it is sent to control section 2-1.Control section 2-1 receives this signal and controls low-level interface part 2-3 so that output info4.Send info4 to terminal equipment 3 subsequently.The receiving unit 3-2 of terminal equipment 3 receives this signal and decoding, notifies control section 3-1 simultaneously.Then, control section 3-1 places starting state with terminal equipment 3.

(2) withdraw from startup from the exchange termination execution

To start be when exchange termination I carries out when withdrawing from, and microprocessor 11 is exported ACT=0 from operative position output 21.From Zone bit circuit 23 flag bit is added combinational circuit 24, this signal sends on the network terminal 2, situation as mentioned above.

This signal is received and deciphers at the main interface part 2-2 of the network terminal 2, and is sent to control section 2-1.The interface 2-3 of control section 2-1 control terminal one side is so that output info0, info0 are sent to terminal equipment 3.After the receiving unit 3-2 of terminal equipment 3 received this signal, terminal equipment 3 just was placed in and withdraws from that starting state and control section 3-1 control sends part 3-2 so that output info0.After the control section 2-1 of the network terminal 2 received above-mentioned ACT=0, it controls main receiving unit 2-2 so that output POFF.POFF outputs on the exchange termination 3, so just loses frame synchronization.At this moment wait, operative position detection device 18 detects the reception of POFF and with this advisory microprocessor 11.Microprocessor is by operation output 21 output EQR=0, situation as mentioned above.Combinational circuit will add from the flag bit of status signal circuit 23.This EQR=0 is to the network terminal 2 outputs.Like this, S/T point and U point all are placed in the state that withdraws from startup.

In other cases, the operation of each part and above-described situation (1) and (2) are similar, carry out preset program.

Figure 12 has illustrated the table tennis transmission system.In the figure, " A " represents a NTU of telephone office's one side, a NTU of " B " GC group connector one side.The transmission signal of the frame representative of hachure from telephone office's one side direction terminal, one side arranged, do not have the received signal of the frame representative of hachure from terminal one side direction telephone office one side.In the table tennis transmission system, from signal and the signal that comes self terminal one side mode alternate transmission with block transfer on the two-wire subscribers feeder of telephone office's one lateral terminal equipment.

Shown in Figure 13 in according to the embodiment of system of the present invention the structure of telephone office's one side NTU, Figure 13 is corresponding to the network terminal among Fig. 7 B 12,14.In Figure 13, the 31st, the block transfer control circuit, the 32nd, switching circuit, 10 is transformers, 35 is equalizers, and 36 is synchronizing detection circuit, the 37th, set up signal synchronously, the 38th, do not set up signal synchronously, 39 is equalizer control circuits, the 40th, the initial setting up signal.

In the table tennis transmission system, in the NTU of telephone office's one side shown in Figure 13, the switching that transmits and receive is to carry out under the control of block transfer control circuit 31.Switching circuit 32 is carried out the switching of switch, switches between transmit status and accepting state like this.Under transmit status, a transmission signal that sends from drive circuit 34 is sent to subscribers feeder through transformer 10.Under accepting state, the received signal that sends from subscribers feeder is input to equalizer 35 through transformer 10 and switching circuit 32.The amplitude and the frequency of 35 pairs of received signals of equalizer are carried out equilibrium.

Among Figure 13, under transmit status, for the NTU from telephone office's one side sends training mode through subscribers feeder to terminal one side, the switch in the switching circuit 32 remains on the state of disconnection, makes the transmission signal from drive circuit 34 can not enter equalizer 35.Secondly, under accepting state, switch 32 is closed, the noise that when switching circuit 32 self action, produces, or the remaining component (leakage) of the signal that transmitted in the transmit status before switch closure all can enter equalizer 35, though rare.The level of equalizer 35 is set by these signals exactly, and the output of equalizer 35 is inputs of synchronizing detection circuit 36.The frame synchronization state of synchronizing detection circuit 36 detecting telephone offices one side, signal 37 is set up in output synchronously when frame synchronization is set up, and signal 38 is not set up in output synchronously when frame synchronization is set up.When not setting up signal 38 outputs synchronously, equalizer control circuit 39 is periodically to equalizer 35 output initial setting up signals 40.Do like this equalizer 35 is set in initial condition periodically.The initial condition of equalizer 35 is corresponding with the state of minimum incoming level, i.e. maximum gain state, if come the training mode of self terminal to decay in transmission line, this can be received.Set up and have when setting up signal output synchronously when frame synchronization, initial condition signalization 40 stops output and set up incoming level in equalizer 35.

Like this, in the present invention, if in the NTU of telephone office's one side, equalizer is arranged on the level of a mistake owing to noise, because it is changed to initial condition periodically, like this, as mentioned above, just prevented to receive the problem of normal signal, made the setting that correctly to finish incoming level in the reception equalizer of telephone office's one side.

Figure 14 A and 14B have shown at telephone office's one side initial setting up signal and have set up relation between the signal synchronously.Figure 14 A has shown the state before the synchronous foundation.On subscribers feeder, have only the signal of telephone office's one side of showing with the hachure frame table to take place as transmission signals.From the synchronizing detection circuit, do not send and set up signal synchronously.In this state, exporting the initial setting up signal periodically " resets ".Figure 14 B has shown the state of having set up synchronously and having sent signal from terminal one side on terminal.The signal of telephone office's one side shows that with the hachure frame table signal of terminal one side is not with there being the frame table of hachure to show, two signals alternately send as transmission signals on subscribers feeder.When setting up on the position synchronous shown in the figure of telephone office's one side, become " 1 " from the signal " synchronously " of setting up synchronously of synchronizing detection circuit.Then, no longer exporting the initial setting up signal " resets ".The training mode of the equalizer origin self terminal in telephone office's one side NTU is set incoming level.In this case, the initial setting up signal " resets " and promptly produces after from the signal ended of telephone office's one side, after this, and the signal of input terminal.The equalizer of telephone office's one side can not be provided with its incoming level by the residue signal of noise or telephone office inside, so the signal that level is set the origin self terminal correctly carries out.

Figure 15, Figure 16 and Figure 17 have shown more detailed structure.Figure 15 has shown the concrete structure of synchronizing detection circuit 36, and Figure 16 and Figure 17 have shown the concrete structure of block transfer control circuit 31 and equalizer control circuit 39 respectively.Among Figure 15 to 17,51 for receiving data, the balanced end signal of 52 representatives, 53 represent a gate circuit, and 54A, 54B are clock signals, 55 is triggers (FF), 56 is shift registers (SR), and 57 is coincident circuits, the 58th, and the sign detectable signal, 59 is JK D-flip flops (JKFF), 59B, 60, the 61st, gate circuit.62 is counters, the 63rd, the output of counter, 64 is gate circuits, the 65th, meet signal, and 65A is a gate circuit, 66 is counters, 67 is read-only memorys (ROM), the 68th, receive block transfer signal (SRCNT), and the 69th, reset signal, 70 is triggers (FF), 71 is shift registers (SR), 72, the 73rd, gate circuit, 74 is triggers (FF), the 75th, set up signal synchronously, the 76th, do not set up signal synchronously, 77 is counters, 78 is short circuit terminal blocks, 79 is counters, the 80th, and the initial state signalization (RST) of equalizer.

Figure 18 has shown an example of data format of the present invention.F is a flag bit, replaces between " 10000000 " and " 10000001 ", and M is an operative position, B ₁, B ₂Be the B channel data, D is the D channel data, and L is a dc balance position.

In Figure 15 to Figure 17, reception data 51 from the equalizer (not shown) are received through the gating of gate circuit 53 by the balanced end signal 52 from same equalizer, and going out markers from receiving extracting data, the clock 54A by formation like this receives data and is latched in earlier in the trigger 55.Shift register 56 constitutes by 8, and the serial received data that slave flipflop 55 is imported are converted to 8 parallel-by-bit signals.Whether this parallel signal meets with flag bit pattern (" 10000000 " or " 10000001 ") by meeting detection circuit 57 detections.When it and flag bit pattern meet, by meeting detection circuit output identification detectable signal 58.Because the 8th conversion between " 0 " and " 1 " of flag bit pattern, and because the 8th of symbol detection circuit 58 is necessary conversion, so be equipped with JK flip-flop 59A and gate circuit 59B.When not setting up synchronously, sign detectable signal 58 becomes the input of the loading end L of 10 digit counters 62 through gate circuit 60,61.When setting up synchronously, the signal 75 of setting up synchronously on the trigger 74 becomes " 1 ", indicates that thereupon detectable signal 58 is blocked by gate circuit 60.

Counter 62 is by the cycling that transmits in groups, occurs in the next block transfer cycle and export 63.Gate circuit 64 is surveyed the relation that meets between output 63 and the sign detectable signal 58, and when the two was consistent, gate circuit 64 outputs met signal 65, and this signal is added on the loading end L of 10 digit counters.The output of counter 66 is added on the ROM67, ROM67 produces various clock signals then, as received signal (SRCNT) 68 and reset signal (RSTS) 69 in groups, also have other output simultaneously, meet signal 65 and the output of trigger 70 is changed to " 1 " and it is resetted by reset signal (RST) 69.The output of trigger 70 is added on 8 bit shift register 71.Shift register 71 is resetted by the trailing edge of received signal (SRCNT) 68 in groups.

At this moment, the output that meets signal 65 means N the mark position of received signal is identical with the mark position of N+1 reception triggering signal in groups.That is, frame synchronization is set up.Therefore, set flip-flop 70 is illustrated between N and N+1 the triggering received signal and has set up frame synchronization.Trigger 70 is not set this situation explanation and does not set up frame synchronization between N+1 reception triggering signal.Reset signal (RSTS) in the clock signal that trigger 70 is produced by ROM67 during each block transfer resets.When frame synchronization is by the output of trigger 70 being added to when being continued on the shift register 71 for the state of continue setting up, shift register is changed to " 1 " continuously, when frame synchronization is not when continuing the state set up in continuation, and then reset continuously.

When the output of shift register 71 is continuous when being " 1 " three times, gate circuit 72 outputs " 1 ".When the output of shift register 71 is continuous when being " 0 " six times, gate circuit 73 outputs " 0 ".The output of gate circuit 72,73 is added to trigger 74 and it is set or resets.The set output of trigger 74 promptly is to set up signal 75 synchronously, and its output that resets is not set up signal 76 synchronously.Gate circuit 72,73 is surveyed the continuous output of three times and six times respectively so that produce an output and form synchronous protective circuit thus.

Counter 77 is formed by the n position, and it produces the timing signal with each cycle by the clock pulse 54B from telephone office's one side being subtracted counting.Required in the various clock signals that formed by counter 77 clock signal can be selected and export to the short circuit wiring utmost point 78 arbitrarily by the connection between terminal block.Trigger 74 set up signal 75 synchronously through anti-phase and be added on the reset terminal of counter 79.Do not set up synchronously on the start end that signal 76 is added to counter 79.Therefore, counter 79 is being set up hold reset state under the state synchronously, the reset signal of equalizer (RST) is not exported, and do not setting up synchronously under the state (lock-out state), but counter is in the operating state and the initial state signalization (RST) 80 of output equalizer periodically.

Figure 19 is a sequential chart, and ruuning situation when setting up synchronously in system according to the present invention is described.Among Figure 19, each signal is used in reference number identical among Figure 15 to Figure 17 and represents.

Figure 20 is a sequential chart, and the ruuning situation of (lock-out) when not setting up synchronously is described in system according to the present invention.Each reference number in Figure 20 is corresponding to the situation among Figure 19.

The present embodiment has shown an example that uses hardware to constitute.But obviously the function shown in Figure 17 can be carried out by the same structure that is made of software.That is,, adopt the timer that forms by software to produce recurrent pulse, it is added on the equalizer as the initial setting up signal setting up signal 75 synchronously not during " 1 ".

According to the present invention, a boot sequence is provided between the network terminal and exchange termination, it is corresponding with the boot sequence between the terminal equipment and the network terminal.Like this, just, provide a kind of on the control line that uses on integrated service digital network (ISDN) subscribers feeder the very useful system of boot sequence.

In addition, according to the present invention, in the digital subscriber line transmission system in the NTU of telephone office's one side, set up when synchronous as the network terminal one side when using from the signal of the network terminal, telephone office's internal signal is received equalizer carry out initial setting up periodically, until setting up synchronously.When the signal that comes self terminal was set up frame synchronization, initial setting up stopped, and had so just set the incoming level of telephone office's internal signal receiver.Therefore, even the NTU of the network terminal one side is to provide power supply by interior arrangement, the reception equalizer of telephone office's one side also can be reset, and can correctly set the incoming level that receives equalizer in telephone office's one side like this.

Claims (17)

1, a kind of in Digital Subscriber Line the method for Control Network boot sequence, this network is by terminal equipment, the network terminal that is connected with a plurality of above-mentioned terminal equipments, and constitute at the exchange termination that telephone office's one side provides is characterized in that:

When above-mentioned Digital Subscriber Line was in wait state, the above-mentioned network terminal was in a kind of state that can only receive a signal;

When above-mentioned terminal equipment sends a calling, the transmission part of the above-mentioned network terminal is driven by a network start-signal that receives from above-mentioned terminal equipment, and, from input signal of above-mentioned exchange termination reception the time, the transmission part of the above-mentioned network terminal is driven by a network start-signal that receives from above-mentioned exchange termination, like this, partly upwards state exchange termination from above-mentioned transmission and send a synchronous mode signal;

Set up the synchronous of above-mentioned exchange termination therefrom.

2, according to a kind of method that is used for the Control Network boot sequence of claim 1, wherein when boot sequence be when above-mentioned terminal equipment is carried out, above-mentioned terminal equipment sends one to the above-mentioned network terminal and starts request;

When the above-mentioned network terminal when above-mentioned terminal equipment is received above-mentioned startup request, the above-mentioned network terminal sends a training mode to above-mentioned exchange termination;

When above-mentioned exchange termination receives above-mentioned training mode from the above-mentioned network terminal, and when setting up frame synchronization, send the signal that an expression has been set up synchronously from above-mentioned exchange termination to the above-mentioned network terminal, the above-mentioned network terminal is with the above-mentioned terminal equipment of this signalisation;

When above-mentioned terminal equipment received above-mentioned signal and sets up frame synchronization, above-mentioned terminal equipment sent data pattern to the above-mentioned network terminal, and the above-mentioned network terminal notifies above-mentioned exchange termination to receive this data pattern; And

When above-mentioned exchange termination when the above-mentioned network terminal receives this information, promptly set up starting state, and notify above-mentioned terminal equipment from above-mentioned exchange termination through the above-mentioned network terminal this situation.

3, according to a kind of method that is used for the Control Network boot sequence of claim 1, wherein when boot sequence be when above-mentioned exchange termination is carried out, above-mentioned exchange termination is sent one to the above-mentioned network terminal and is started request;

When the above-mentioned network terminal detected this startup request, the above-mentioned network terminal sent a training mode to above-mentioned exchange termination;

When above-mentioned exchange termination receives above-mentioned training mode and sets up when synchronous from the above-mentioned network terminal, send the signal that an expression has been set up synchronously from above-mentioned exchange termination to the above-mentioned network terminal, give above-mentioned terminal equipment by the network terminal with this signalisation then;

When above-mentioned terminal equipment received above-mentioned signal and sets up frame synchronization, above-mentioned terminal equipment sent a data pattern to the above-mentioned network terminal, and notified above-mentioned exchange termination to receive this data pattern by the above-mentioned network terminal; And

When above-mentioned exchange termination receives information from the above-mentioned network terminal, promptly to set up synchronous regime, and notify above-mentioned terminal equipment by above-mentioned exchange termination through the above-mentioned network terminal this situation, above-mentioned like this terminal equipment promptly is activated.

4, a kind of method that is used for the Control Network boot sequence according to claim 1, wherein by alternately send the signal of transmission in groups to the subscribers feeder that connects the above-mentioned exchange termination and the above-mentioned network terminal, the incoming level that signal in the NTU of above-mentioned exchange termination one side receives equalizer is by being to set up a signal sets transmitting synchronously on a suitable value by the opposing party, above-mentioned NTU in the above-mentioned exchange termination is furnished with the initial setting up device that is used for signal reception equalizer, in the above-mentioned NTU of this exchange termination one side sets up synchronously, when frame synchronization is set up, this initial setting up is just ended, so that an incoming level is set in above-mentioned exchange termination.

5, by an exchange termination, a network terminal, and the system that is used for the Control Network boot sequence of terminal equipment formation, it is characterized in that: above-mentioned exchange termination comprises a circuit that is used for the identifying operation signal, the circuit of an output aforesaid operations signal, with a control device, this control device selects basis from the exchange termination command signal of a main equipment and/or an operation signal that operation signal is exported of exporting from the above-mentioned network terminal.

Wherein, the aforesaid operations signal is according to from the output signal of the above-mentioned network terminal and/or come the signal of autonomous device to select and to above-mentioned network terminal output.

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