JPH0246059A - Busy signal transmitting system in no 7 signal device having tuning function - Google Patents

Abstract

PURPOSE:To eliminate interruption to transmit a busy signal even in transmit ting a frame by long tuning when a self device inside is converged by driving a busy signal generating part when next frame requirement is outputted to a memory control part after busy transmitting indication is given from high order. CONSTITUTION:When receiving buffer busy generation is detected in the control ling of signal transmitting/receiving by an No 7 signal control program 211 in a processor 21, an SIB (busy) transmitting program 212 is started up, an SIB register 23-1 is set, an SIB transmitting indication is supplied to a dynamic memory control circuit 24 with first tuning function 24 and next, is given also to an HDLC transmitting circuit 25. Thus, the HDLC transmitting circuit 25 transmits a busy signal in an SIB generating circuit 251 as the frame of an HDLC format in order before outputting next frame transmitting requirement. For the busy signal, when the condition of high order is not changed, transmit ting indication is executed at a fixed cycle, and an action in the same way as the above is executed every time. Thus, processing can be made high speed.

Description

[Detailed Description of the Invention] [Summary I NO? Busy signal sending method in a signaling device The purpose of this invention is to provide a busy signal sending method in an NOV signaling device that has a chaining function that allows quick sending when a busy sending instruction is received, and the purpose is to provide a busy signal sending method in a NOV signal device that can transmit a busy signal via a common channel signal link. H using the function
A NO3 signal device that transmits and receives messages in DLC format is provided with a busy transmission instruction hard register that is set by a busy transmission instruction from a host device, a busy signal generation section is provided in an HDLC transmission section having a chaining function, and the HDLC transmission section is provided with a busy signal generation section. When the busy sending instruction hard register is set, the chaining function is interrupted, and the sequence number held by the BSN hard register in the busy signal generating section, the sequence number in the transmitted frame of the transmitting section, and the fixed code generating means are A busy message is created based on the output, and a new chain is formed with the created busy message at the beginning and sent.

[Industrial Application Field] The present invention relates to a busy signal sending method in an NOV signal device.

CC [NO? standardized by TT? Common line signaling equipment (hereinafter simply referred to as NO7 signaling equipment) is used to transmit various control signals and data between exchanges and other equipment via common line signaling links that are independent of communication channels such as voice. Ru. The NO7 signaling device sends and receives data in HDLC (high level data link control procedure) format, and conventionally, control signals corresponding to each channel (each communication path such as a speech path) of the HDLC format were sent consecutively by chaining. and send it. On the other hand, the CCITT recommendation stipulates that when a busy state (comparison state) occurs at the upper level (upper level of the protocol), a busy signal should be sent to the signaling device of the other station to notify the other station of the busy state. There is.

However, when signals are sent using chaining in the HDLC format as described above, it is difficult to send a busy signal immediately, and an improvement is desired.

[Prior Art] FIG. 3 is an explanatory diagram of the NOV signal device, and FIG. 4 shows the signal form on the common signal line.

In order to simplify the explanation, FIG. 3 shows an example in which a plurality of terminals such as telephones are connected to switching devices 30 and 32, respectively, and a communication line 3 for communication between the terminals is provided between the switching devices.
1 is provided (for multiple channels), and each exchange device is further provided with NO3 signal devices 33 and 35 for transmitting control signals (selection signals for forming !lil, etc.).
A common signal line 34 for control signal transmission is connected between the OV signal devices.
is provided.

The NOV signal device sequentially transmits control signals corresponding to each communication line (channel) in the form of a message signal unit (indicated by MSU) as MSUI, MSU2, and so on. HDLC format data has flags (indicated by F in Figure 4) before and after the data, and the data part includes a transmission sequence number (cFsN: forward sequence number), a reception sequence number (BSN: backward sequence number), Check signal (FC3
: Frame check sequence) etc. are added.

In FIG. 5(a), which shows a conventional MSU transmission procedure using chaining, CB indicates the state of chaining, and becomes ``lo'' when chaining continues, and 0 when chaining ends.

This chaining function is
When a control code is set in the ptor), it is connected to the sending hardware and 5TART/5TOP is performed, the chaining process is executed by the firmware program and the sending operation is performed. Therefore, the firmware only chains the disc libter, and normally the device itself does not need to know how far transmission has been completed, leaving the processing to the hardware.

On the other hand, according to the 1984 recommendation of CCITT, the busy signal (original name is Signal) indicating that the reception buffer is busy.
Indication Busy (hereinafter referred to by the initials ° “SIB”)
This signal is set to have a high priority because it notifies the other station that it is busy and requests that the other station stop transmitting.

To explain the conventional method for transmitting the busy signal, as shown in Fig. 5(a), after starting the transmission of checked MSU data, even if there is an instruction to transmit the busy signal, the transmission remains unchanged. In this case, a busy signal is sent out after all chained MSUs are sent, and priority sending is not possible.

Therefore, when the disc libter that is currently sending out based on the information that has already been chained finishes sending out, it receives a suspend instruction (Suspend: interruption interrupt), and when it completely stops, it restarts the chaining with the busy signal at the beginning. was going on.

(Note that when suspend is executed, there is no data to send, and the Idle pattern is continuously sent to the line.) The conventional busy sending sequence diagram is shown in Figure 5(b). In the figure, when suspend occurs during MSUI transmission, the chaining process stops due to hardware interruption, creates a busy signal frame, uses it as the beginning, and checks unsent message signals MStJ2 and below. The transmission is performed by

FIG. 5(C) shows a flow diagram of a conventional busy sending program. In this flow, a busy frame is generated due to a busy transmission request (51 in the same figure), but at this time,
The transmission sequence number (FSN) and reception sequence number (BSN) necessary for an HDLC format signal frame are not included.

In other words, in the NO7 signal device, one
It is specified that each frame of a message (MSU) is colored by a sequence number, and each frame of a message (MSU) is assigned a specific number in sequence, but in the case of frames other than messages such as busy signals, frames sent immediately before Use the number of the frame (same number).

Therefore, after suspending and requesting an interruption using 52 in FIG. Find the transmit sequence number (FSN) of the disc libter, copy the obtained sequence number to the busy signal ° frame,
Is there any other BSN (this is the sequence number of a successfully received message frame)? An HDLC frame is created from the hardware of the signaling device.

Thereafter, by forming a chain with unsent message frames (MS02 and below) and restarting (56 in FIG. 5(C)), the message frames are sequentially transmitted as shown in FIG. 5(b).

[Problem to be solved by the invention] As mentioned above, NO? Each signaling system has a sequence number (FNS), and in a sending circuit with a chaining function, the sequence number is naturally updated not when the signal is sent to the line, but when chaining processing is performed.

Therefore, when transmitting a busy signal with priority, the FSN value of the busy signal must be set to the FSN value actually sent to the line.

Therefore, conventionally, after suspending the communication that is being sent, the program checks the FSN value of the final sending signal, and then
This is done by setting the SN value and then sending out the busy signal, which makes the program control complicated and time-consuming, and there is a problem in that the signal cannot be sent quickly after the busy instruction is generated.

SUMMARY OF THE INVENTION An object of the present invention is to provide a busy signal sending system in an NOV signal device having a chaining function that can quickly send signals when a busy sending instruction is received.

[Means to solve the problem] FIG. 1 shows a basic configuration diagram of the present invention.

In FIG. 1, 8 is a memory control unit including a chaining control unit 9, IO is a BSNSN hard register that holds a reception sequence number BSN, and 1 is a busy sending instruction hard register that is set by a command from a higher level when a buffer busy state occurs. 12 is an HDLC transmission section, 13 is a frame creation section, 14 is a transmission section, 15 is a busy signal generation section,
16 represents fixed code generation means, and 17 represents signal generation means.

In the present invention, when a busy transmission instruction is set in the busy transmission instruction hard register, the BSN (receiving sequence number) of the hard register holding the BSN value and the second word (transmission sequence number: FSN) of the frame that was previously transmitted are
), and other necessary words are obtained from the fixed code generating means and incorporated in the air to generate and send out a busy signal.

[Function] After the busy transmission instruction shown in FIG. 1 is given to the busy transmission instruction hard register 11 from the upper level, when the HDLC transmission section 12 issues the next frame request to the memory control section 8, if this instruction is set. The busy signal generator 15 is driven.

As a result, the signal generating means 17 in the busy signal generating section 15
The fixed code generating means 16 outputs the SIB code (represented by 1 byte, using 05'' for 16 signal codes) and the Ll code (represented by length indicator: L■, which is 1 byte long in the case of a busy code. Each code (01" representing this) is set in the storage sections 174 and 173 through the gate 161 opened by the output of the busy sending instruction hard register 11.

Also, the BSN hard register 10 is asynchronously set to NO7.
A reception sequence number BSN updated by a control program section (not shown) is stored, and its contents are stored in the storage section 171 of the signal generation means 17 in the busy signal generation section 15.
is set to

On the other hand, the contents of the previously transmitted frame remain in the transmitter 14 (will become empty when the next transmit data enters), and its second word, FSN (1 byte), is opened by the set output of the hard register 11. The signal passes through the opened gate 161 and is set in the storage section 172 of the signal generating means 17.

When a 4-byte signal is generated in the busy signal generator 15, the frame generator 13 is notified.

As a result, the frame creation unit 13 executes processing for reconfiguring chaining (chaining the beginning of the untransmitted MSU starting with the busy signal frame) under the control of the chaining control unit 9 of the memory control unit 8. In that case, the signal generated by the G signal generator 15 is then transmitted to the frame generator 13.
The data is inputted through the route (■) and sent out from the transmitter 14 after undergoing processing such as adding a flag. When the busy signal frame is sent out, the HDLC sending unit 12 generates a signal to reset the busy sending instruction hard register 11, and stops outputting the sending instruction. This busy signal is sent out for one frame at regular intervals.

[Example] FIG. 2 shows a configuration diagram of an embodiment of the present invention.

In FIG. 2, 20 is a NO7 control device, 21 is a processing unit (CPU), 22 is a memory, 23-1 is an STB (busy) register in which a busy sending instruction is set, and 23-
2 is a BS that holds the BSN value updated by the processing device
N register, 24 is a first dynamic memory control circuit with chaining function, 25 is an HDLC sending circuit, 26 is a second dynamic memory control circuit with chaining function, 2
7 represents an HDLC receiving circuit.

The processing device 21 is connected to a processing device such as an exchange (not shown). According to the signal IIJm program 211, the HDLC sending circuit 25. An SIB generation circuit 251 according to the present invention is provided in the HDLC transmission circuit 25, which controls the reception circuit 27 and controls the transmission and reception of signals via the common line signal line with the NO7 control device of the other station, and the BSN register 23- 2 BSN (reception sequence number), FSN (transmission sequence number) of the transmitter frame of the transmission register (not shown) in the HDLC transmission circuit 25, generated by the built-in fixed code generation circuit (16 in Figure 1) A code consisting of a plurality of bytes constituting a busy signal is generated using the SIB code, Ll code, and the like.

The chaining function is controlled by the program of the built-in firmware, and the dynamic memory control circuit 24 with the 1,000th chaining function selects the MSU to be transmitted in the memory 22.
(created at a higher level). The HDLC receiving circuit 27 has the same configuration as the conventional one, checks the received frame, and extracts the original M from the HDLC format.
The SU is restored and stored in the memory 22.

NOV signal control program 211 in processing device 21
When detecting the occurrence of a receive buffer busy while controlling signal transmission and reception, the 5IB (busy) sending program 212 is activated, the SIB register 23-1 is set, and the SIB register 23-1 is set.
The transmission instruction is supplied to the first dynamic memory control circuit with chaining function 24, and then to the HDLC transmission circuit 25.
It is also given to

As a result, the HDLC sending circuit 25 causes the SIB generating circuit 251 to perform the first frame sending request before issuing the next frame sending request.
Busy signals generated according to the principle shown in the figure are sequentially sent out as HDLC format frames.

When the transmission of the busy signal is finished, a transmission request is made to the first dynamic memory control circuit with chaining function 24, and the S
Reset the IB register 23-1.

The busy signal is instructed to be sent at regular intervals unless the upper level status changes, and the same operation as described above is performed each time.

[Effects of the Invention] According to the present invention, even if the NO7 signal device is transmitting a long chained frame when there is congestion within itself, there is no interruption for transmitting a busy signal, so processing can be performed at high speed. can be achieved.

[Brief explanation of the drawing]

Fig. 1 is a basic block diagram of the present invention, Fig. 2 is a block diagram of an embodiment of the present invention, Fig. 3 is an explanatory diagram of the NO7 signal device, and Fig. 4 shows the signal form on the common line signal line. Figure, Figure 5 (al
5 is a diagram showing the MSU transmission procedure using conventional tuning, and FIG.
Figure (C) is a flow diagram of a conventional busy sending program. In FIG. 1, 10: BSN hard register 11: Busy sending instruction hard register 12: HDLC sending section 13: Frame creating section 14: Transmitting section 15: Busy signal generating section 16: Fixed code generating means 17: Signal generating means

Claims (1)

[Claims] H using a chaining function via a common line signal link
The NO7 signal device that sends and receives DLC format messages is equipped with a busy sending instruction hard register (11) that is set by a busy sending instruction from a host device, and a busy signal generating section ( 15), the HDLC sending section (12) interrupts the chaining function when the busy sending instruction hard register (11) is set, and also sets the BSN hard register (10) in the busy signal generating section (15). A busy message is created using the retained sequence number, the sequence number in the transmitted frame of the transmitter (14), and the output of the fixed code generating means (16), and a new chain is formed with the created busy message at the beginning. A busy signal sending method in a NO7 signal device having a chaining function characterized by sending out a busy signal.