JPH05145666A - Management equipment for isdn terminal endpoint identifier - Google Patents

Abstract

PURPOSE:To provide the management equipment for ISDN terminal endpoint identifier in which a terminal endpoint identifier number is quickly given and it is easily applied to the actual operation. CONSTITUTION:A control section 3 implements a check request to a terminal equipment with respect to all terminal endpoint identifiers already allocated at every lapse of a prescribed set time set by one of plural times of timers set to a time measurement section 7 and a memory 4, a terminal endpoint identifier giving no reply without replying a check request is released and when a reply comes to all the terminal endpoint identifiers, a time of a timer is revised into other timer time stored in the memory 4 as the feature of this invention.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ISDN terminal terminating identifier management device, and more particularly to an ISDN terminal terminating identifier management device capable of quickly assigning TEI.

[0002]

2. Description of the Related Art Terminal equipment (hereinafter referred to as T
When E) is connected, the TE is first powered on, and when the data link is set up in the ISDN network for the first time, the network is requested to allocate a terminal termination identifier number (hereinafter referred to as TEI number). When this TEI number allocation request is received,
On the network side, a TEI number which is not yet assigned to the TE is searched out of the managed TEI numbers and is assigned to the requested TE.

On the other hand, when the TEI number is abandoned, for example, when the TE is disconnected from the network, the TE on the network side is abandoned.
The I number is not returned to the unused state, and the unused T
The TEI already assigned by the network only when the EI number is exhausted and a new TEI assignment request is received.
There is a management method in which it is checked whether or not a number is used, and if there is an unused number, the TEI number is assigned to the requesting TE (TT.
C standard JT-1431, Q921).

[0004]

Therefore, the response time from the network to the TEI number allocation request is the unused TEI number.
The number varies depending on whether or not there is a number, and varies depending on the length of the search time when there is no unused TEI number, and is not constant.

Further, it takes a long time to give the TEI, which is an inconvenience because it wastes a time for setting the link which requires the highest speed.

Therefore, it is considered to check the usage status of the TEI number at regular intervals and release the TEI number that is actually unused.

However, TTC standard JT-I43
In 1 and Q921, the maximum number of TEs that can be connected to one interface is eight, and the TEIs that can be assigned by the TEI management procedure are 63 to 64 to 126, but in reality, Is that the number of QTEs connected to one interface is different for each interface, the number of connected TEs changes frequently even if the same interface has TE portability, and the TEI number that can be assigned varies. Although the maximum number is 63, it has been found that it is difficult to set the optimum time interval for activating the check to one considering that various selections can be made in system design.

The present invention has been made in view of the above circumstances, and is an ISDN in which a TEI number can be assigned quickly and which can be easily applied to actual operation.
An object is to provide a terminal termination identifier management device.

[0009]

The device of the present invention is
Storage means for storing a plurality of preset timer values,
A time measuring unit that measures a certain time, a timer counter that counts up each time a certain measuring time of the time measuring unit elapses, and a plurality of timer values that are selected in a predetermined order each time the timer counter counts up. Comparing means for comparing the count value of the timer counter with the count value of the timer counter, and when the count value of the timer counter is equal to or greater than the timer value, a check request is made for all the assigned TEI numbers, and a response is sent to the check request. If there is no response, the unresponsive TEI number is released, and if a response is received for all the TEI numbers, the control unit for revising the timer values compared by the comparison means in a predetermined order is provided. It is characterized by being provided.

[0010]

According to the present invention, a check request is made for all the assigned TEI numbers at every predetermined time determined by the time measured by the time measuring unit and the preset timer value. Then, the TEI number that does not respond to this check request is released and all TEI numbers are released.
When a response to the EI number is received, the time to repeat the check request thereafter is reset by revising the preset timer value, and then the above procedure is repeated.

If there is a new TEI number allocation request from TE when there is a TEI number released due to no response,
One of the released TEI numbers is given to the TE.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be specifically described below with reference to the drawings.

FIG. 1 shows an ISDN according to an embodiment of the present invention.
FIG. 3 is a block diagram of a terminal termination identifier management device, which is used for a TE used for a link access procedure (LAPD) on a data channel (D channel) in a data link layer of an ISDN user network interface.
The ISDN network subscriber line terminating unit used for managing I is a subscriber line terminal 1, a subscriber line interface unit 2, a central control unit 3, a memory 4, a timer counter 5, a count value comparing unit 6, and a time measuring unit 7. Is equipped with. Further, the memory 4 is provided with a timer value storage unit 41, a TEI management map 42, and the like.

The data from the TE (not shown) is read by the central control unit through the subscriber line interface unit 2, and the data written from the central control unit 3 to the subscriber line interface unit 2 is directly transferred to the TE. Sent.

When the "ID request" code requesting the allocation of the TEI number is received from the TE, the central control unit 3 searches the TEI management map 42 for the unused TEI number and joins the "ID allocation" code. The state of the TEI management map 42 is changed to "in use" at the same time when the data is written in the private line interface unit 2.

The central processing unit 3 is configured to perform the TEI number check procedure shown in the flow chart of FIG. 2, for example.

That is, the central control unit 3 constantly monitors the time measuring unit 7 and counts up the timer counter 5 on the basis of the signal output when a certain period of time elapses, and at the same time monitors the comparison result from the comparing unit 6. .. The comparison unit 6 compares the timer counter 5 with a timer value selected from a plurality of preset timer values stored in the timer value storage unit 41 in a predetermined order, for example, in ascending order, and outputs the result. Notify the central controller 3.

If the comparison result by the comparison unit 6 is "match" or "count value of timer counter 5> timer value", it is determined that the time-out has occurred (step S
1), the check procedure is activated (step S2). As a result, the "ID check request" code is sent to the TE for all the used TEI numbers, and it is checked whether or not the "ID check response" code in response to this is received from each TE (step S3).

When the TEI number is abandoned, for example, when the TE is disconnected from the network, there is no response to the "ID check request" code. Therefore, "ID
Central control unit 3 depending on whether or not a "check response" is received
Can know whether the TEI number is currently used. Therefore, it is determined that the TEI number without the “ID check response” is unused at the moment, and T
The state of the EI management map 42 is changed to an unused state (non-allocation) (step S4). Check start (step S
2) The procedure up to this point is repeated for each TEI number, and when it is confirmed that all the TEI numbers being allocated have been checked (step S5), "ID check" is performed for all TEI numbers in use. response"
Is received (step S6). When the "ID check response" is received for all the TEI numbers in use, the comparison unit 6 sets the timer value used for comparison to, for example, the second smallest value stored in the Mima value storage unit 41. The process is performed again (step S7), and the process returns to the step (step S1) of determining whether or not the time is out.

In this ISDN terminal termination identifier management device, when the preset timer value is reached as described above, whether the information in the TEI management map 42 is valid, that is,
It is possible to secure a margin of unused TEI numbers by starting the work of checking whether all TEI numbers are actually used and releasing the TEI numbers which are judged to be unused at the present time. Even after all the TEI numbers are in use, the TEI number is immediately assigned if there is a released TEI number by performing the check procedure.

Further, when the "ID check response" is received for all the TEI numbers in use as described above, the comparator unit 6 resets the timer value to be used for comparison, so that it is performed more frequently than necessary. It is possible to prevent the check procedure from being repeated and the check routine 21 according to the TEI allocation procedure according to the TTC standard JT-Q921, which takes a relatively long time in the entire usage state and is relatively time-consuming, to be performed.
With respect to the "ID request" code from the TE, the TEI number can be quickly allocated without performing the check routine 21 according to the TEI allocation procedure according to the TTC standard JT-Q921 as shown in FIG.

In FIG. 3, SAPI is 63 and TE
I is 127 (group TEI), Ai is operation display, Ri
Indicates the reference number, () indicates the contents of the link address, and [] indicates the contents of the data link layer information field.

[0023]

As described above, according to the present invention, the timer counter is counted up at regular intervals, and when the timer counter reaches a preset value, a predetermined TEI number check procedure is started. Then, the TEI number with no response is set to an unused state, and all TE
When there is a response to the I number, the set value for activating the TEI number check procedure is revised to another preset value, so that the wasteful TEI number is sorted out at each preset time. , TE can immediately assign a TEI number to a TEI number assignment request from the TE, and as a result, a data link setup time with the TE can be minimized.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention.

FIG. 2 is a flowchart showing the operation of the present invention.

FIG. 3 TEI defined in TTC standard JT-Q921
It is a time chart which shows an allocation procedure.

[Explanation of Codes] 2 subscriber line interface unit 3 central control unit 4 memory 5 timer counter 41 timer value storage unit 42 TEI management map

Claims (1)

[Claims] 1. A storage unit for storing a plurality of preset timer values, a time measuring unit for measuring a constant time, and a timer counter for counting up each time a constant measuring time of the time measuring unit elapses. Each time the timer counter counts up, a comparing means for comparing the count value of the timer counter and the timer value selected from the plurality of timer values in a predetermined order, and when the count value of the timer counter is equal to or more than the timer value, When a check request is made for all the assigned terminal termination identifiers, if there is no response to this check request, the unresponsive terminal termination identifiers are released, and if responses are received for all terminal termination identifiers. Is provided with a control unit for revising the timer value compared by the comparison means in a predetermined order. DN terminal terminating identifier management device.