JPH0418832A - Private branch exchange equipment - Google Patents

Abstract

PURPOSE:To reduce invalid starting for PT and to improve the processing capacity of PT by referring to previously stored information on PT(packet-form terminal) and judging and instructing a packet exchange procedure which PT can support. CONSTITUTION:A private branch exchange equipment 15 which is connected to the user/network interface specified point 12 of ISDN(integrated service digital network) 1 and which stored PT 6 is provided with a judgement means 2 judging the channel type of a termination packet call, a storage means storing information peculiar to the stored terminal and a comparison means 7 comparing the channel type which the judgment means 2 judges with a content stored in the storage means 8. Furthermore, an exchange procedure instruction means 7 instructing the packet exchange procedure of the stored terminal 6 based on a compared result in the comparison means 7 and an exchange procedure conversion means 5 converting the packet exchange procedure based on an instruction from the instruction means 7 are provided. Thus, invalid starting for PT is reduced, the packet conversion processing means is simplified and the processing capacity of PT is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a private branch exchange device that supports packet switching services in an I5DN, and in particular, a private branch exchange device that realizes mutual conversion between a D channel packet switching procedure and a B channel packet switching procedure. Relating to a switching device.

[Prior Art] Conventionally, private branch exchange equipment that supports packet switching services in l5DN is rare, and even private branch exchange equipment that provides packet switching services have difficulty in D channel packet switching procedures and B channel packet switching procedures. Private branch exchange equipment that provided one or the other of these procedures was the main type. Furthermore, there has been no private branch exchange device that has a function of converting between the D channel packet switching procedure and the B channel packet switching procedure.

Therefore, in a conventional private branch exchange device of this kind, a call received from an l5DN using a D channel packet switching procedure is processed regardless of whether a packet type terminal (hereinafter referred to as PT) provides D channel packet communication. D for PT
Generally, incoming calls are received using a channel packet switching procedure, and when a request is made from the PT to reject the arrival of a D channel packet, the private branch exchange equipment either executes a new channel switching procedure for the incoming packet or disconnects the incoming packet. I was trying to process it.

[Problems to be Solved by the Invention] However, in the above conventional example, even if the communication control unit (CC) of the private branch exchange device makes a communication request to the PT using the D channel packet exchange procedure, the PT does not perform the B channel packet communication function. If the PT is equipped with only a PT, or if the PT's D channel is in a high traffic state, the PT may refuse to respond to incoming D channel packet calls or may not be able to respond within the timeout specified by the predetermined timer. There are drawbacks.

In addition, in such a case, the communication control section of the private branch exchange device
The D channel link set up between the PT and the PT is released, a new B channel communication path is set up, and the call is received using the B channel packet exchange procedure for the PT, so the communication control unit and the D
This not only complicates the processing procedure of the channel packet handler unit (DPHM), but also increases the number of invalid activations for the PT, which causes a reduction in the processing performance of the PT.

[Means for Solving the Problems] The present invention has been made for the purpose of solving the above-mentioned problems, and includes the following configuration as one means for solving the above-mentioned problems.

That is, in a private branch exchange that is connected to the ISDN user/network interface regulation point and accommodates at least one packet-type terminal, there is a determination means for determining the channel type of an incoming packet call, and a storage device for storing information unique to the accommodated terminal. a storage means for comparing the channel type determined by the determination means with the content stored in the storage means; The apparatus includes exchange procedure instructing means for instructing, and exchange procedure converting means for converting a packet exchange procedure based on the instruction from the exchange procedure instructing means.

[Operation] In the above configuration, when a packet call is received, by referring to information regarding the PT stored in advance, it is possible to determine a packet exchange procedure that the PT can support;
and can give instructions.

[Embodiments] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a block diagram showing the configuration of a private branch exchange device that is one of the preferred embodiments of the present invention.

In FIG. 1, a central control section (CC
) 7 employs a storage program control method that executes exchange functions and controls the entire private branch exchange device 15 according to a control program stored in the memory 7a. Private branch exchange device 15
accommodates subscriber line 1a from l5DNI in TIF2, and has a D channel packet exchange function with l5DNI.
Channel packet handler section (DPHM) 3 and l5
It has a B channel packet handler unit (BPHM) 4 having a function of exchanging B channel packets with the DNI. TlF
Reference numeral 2 denotes an interface unit having a communication function at a single point interface 12 defined in CCI:ITT Recommendation 1.411. In addition, 5IF5 is based on CCITT Recommendation 1.411.
This is an interface unit that has a communication function using an 8-point interface 11 defined in .

The PT6 is a terminal device that is connected to the 5IF5 via the 8-point interface 11 and has an I5DN packet communication function. MM8 has P connected to 8-point interface 11.
This is a memory that stores terminal attributes and terminal status as information unique to the T6 terminal. And the central control unit (CC)
7. TIF2, DPHM3. BPHM4,5IF5 is
Control information and D channel packet calls are coupled by a common bus 10 so that they can communicate with each other. Also, TDSW
9 is TIF2. This is a time division switch for interconnecting the B channels of BPHM4 and 5IF5.

FIG. 2 shows the terminal attributes of the PT stored in the MMS and its memory configuration.

n Ps to the 8-point interface 11 of the private branch exchange device 15
When T is connected, a memory area is allocated for each block to each PT, and to which channel packet exchange can be executed is set in the memory area as terminal information of each PT. There are four types of terminal attributes to be set:

That is, (1) m=o: D channel packet communication procedure terminal (2
)m=1: B channel packet communication procedure terminal (3)
m=2: D and B channel packet communication procedure terminal (4) m=3: Non-packet type terminal (general terminal). Note that here, PT6 is set as a D and B channel packet communication procedure terminal with m=2.

FIG. 3 shows the terminal status of the PT stored in the MMS and its memory configuration.

In FIG. 3, the occupancy rate of each channel in the 8-point interface 11 is stored as the terminal status of each PT.

The terminal status of each PT is expressed by the occupancy rate of channels B1 to B, channels, and D accommodated in the 8-point interface 11. This occupancy rate is the value obtained by dividing the number of used links of each channel by the maximum number of logical links of that channel. Also,
m is the number of 8-point interfaces accommodated in the private branch exchange device 15.

By determining the occupancy rate of each channel for each 8-point interface, even when a plurality of PTs are connected to an 8-point interface (multi-point connection), it can be handled in the same way as the usage status of the terminal.

Next, with reference to the flowchart shown in FIG. 4, a mutual conversion process between the D channel packet exchange procedure and the B channel packet exchange procedure in the private branch exchange apparatus of this embodiment will be described. Incidentally, here, the private branch exchange device 15 is
An example will be described in which a D channel packet call is received from a DNI, and it is converted into a B channel packet exchange procedure and processed.

In step 5201 of FIG. 4, from l5DNI to CCIT
T Recommendation Q, D sent in 931 call setup message
Incoming channel packet call is detected at TIF2. When the central control unit (CC) 7 is notified of the arrival of a D channel packet call by TIF2 in step 5202, in the next step 5203, the central control unit (CC) 7 instructs TIF2 to return a response message to l5DNI, and transmits a message between l5DNI and TIF2. Set up a D channel packet link. At the same time, DPH
M3 is notified of the D channel packet call arrival information and that the D channel packet link has been set up. From now on, T
All D channel packet calls received on IF2 are sent to DP
Transferred to HM3.

The central control unit (CC) 7 receives information about the notified incoming call, such as information on the accommodation location of the PT 6 in the private branch exchange, and whether the incoming call requests the D channel or the B channel. , etc., the terminal attributes of the corresponding PT6 stored in advance in the MM8, and the information regarding the usage status of the D channel of the 8-point interface 11 to which the PT6 is connected, and the D channel packet exchange procedure is possible in the PT6. make a judgment.

That is, in step 5204, the central control unit (CC) 7
Based on the incoming call information notified from F2, PT6 searches the terminal attributes stored in MM8 shown in FIG.
Determine whether the terminal has attributes that allow channel packet communication. As a result of the determination, if the terminal attribute of PT6 allows D channel packet communication, the process advances to step 5205.

In step 5205, the central control unit (CC) 7 refers to the MM8, searches for the D channel occupancy rate in the corresponding terminal, and determines whether the D channel is available.

If the D channel packet exchange procedure to PT6 is possible due to the usage status of the D channel, 5I is executed in step 5206.
Instructs F5 to set up a D channel packet link with PT6. Then, when the D channel packet link is established in step 8206, the next step 5
At 207, the D channel packet call transmitted from the 15DNI is sent to the 5IF5 via the DPHM3, and the D channel packet exchange procedure is started at the S point ink face 11.

If the determination in step 5204 is that the D channel packet exchange procedure is not possible for PT6, step 520
In step 8, it is determined whether PT6 has terminal attributes that allow B channel packet communication. As a result of the judgment, P
If T6 has terminal attributes that allow B channel packet communication, the process advances to step 5209, and the central control unit (CC
) 7 refers to MM8, searches for the occupancy rate of the B channel in the corresponding terminal, and determines whether the B channel is available.

If the B channel becomes available in step 5209, the central control unit (CC) 7 instructs the 5IF 5 to set up a B channel packet link with the PT 6 in step 5210. Once the B channel packet link is established in this step 5210, the next step 5211''cBP
Activate HM4 and transfer the packet call to BPHM4.

Then, in step $212, the D channel packet call transmitted from the l5DNI is transferred to the BPHM4, and the BP
) (M4 switches the forwarded packet call to the B channel packet switching procedure and transfers the transferred packet call to the PT via TDSW9,5IF5.
Send to 6.

If PT6 has a terminal attribute that disables B channel packet communication in step 5208, or if the B channel of PT6 is unavailable in step 5209, the central control unit (CC) 7 sends a message to the l5DNI in step 5213. This instructs TIF2 to return a call rejection message.

As explained above, according to this embodiment, the l5
Since it is possible to convert the channel type of an incoming packet call from the DN, it has the effect of reducing the rate of call rejection at the PT and invalid activation of the PT, and simplifying the processing procedures of the central control unit and each packet handler. .

Further, since the conversion process between the D channel packet exchange procedure and the B channel packet exchange procedure is performed by the central control unit, there is an effect that conversion of the exchange procedure can be realized without increasing the processing load on the PT.

Furthermore, by adopting a method in which the exchange procedure is converted by the central control unit, D channel packet communication is used within the private branch exchange equipment, and B-channel communication using long packets is used for communication with 15DN.
This has the effect of reducing communication costs by performing channel packet communication.

In the above-described embodiment, the memory MM8, which stores the terminal attributes and terminal states of PTs accommodated in the private branch exchange, and the central control unit (CC) 7 are connected to each other by a signal line, but the common bus 10 is By connecting to MM8, DPHM3 or BPHM4 and MM8 can directly exchange data, and DPHM3 or BPHM4 can directly exchange data.
4, the terminal attributes and terminal status may be determined. In this way, there is no need for the BPHM 4 or DPHM 3 to wait for the determination result of the central control unit (CC) 7 (this makes it possible to simplify and speed up the processing in the BPHM 4 or DPHM 3).

[Effects of the Invention] As explained above, according to the present invention, the PT status is determined from the PT specific information, and the packet switching procedure is performed by comparing the determination result with the channel type of the incoming packet call from the 15DN. This has the effect of reducing invalid activation of the PT, simplifying the packet exchange processing procedure, and improving the processing capacity of the PT.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of a private branch exchange device that is one of the preferred embodiments of the present invention, and FIG. 2 shows terminal attributes of PTs stored in the MM of the private branch exchange device of the embodiment and their Figure 3 is a diagram showing the memory configuration, and Figure 3 is a diagram showing the PT terminal status stored in the MM and its memory configuration. Figure 4 is a diagram showing the conversion process between the D channel packet exchange procedure and the B channel packet exchange procedure. It is a flowchart. In the figure, 1...l5DN, 2...TIF, 3...D
PHM (D channel packet handler section), 4...B
PHM (B channel packet handler section), 5...
SIF, 6...Packet format terminal, 7...Central control unit (CC), 8...MM, 9...Time division switch (
TDSW), 10... Common bus, 11... 8-point interface, 12... 1-point interface, 15...
・It is a private branch exchange device. Patent applicant Canon Co., Ltd. agent Patent attorney Yasunori Otsuka (and 1 other person) m: TM
ljA)L (mgo~3) 2nd m: 9th place in the prefecture, 6th ha! HI υ寥つ屯ま 3S劫IRE 9-λ-S0 图3

Claims (1)

[Scope of Claims] A private branch exchange device connected to a user/network interface regulation point of an ISDN and accommodating at least one packet-type terminal, comprising: determination means for determining the channel type of an incoming packet call; and the accommodated terminal. storage means for storing unique information; comparison means for comparing the channel type determined by the determination means with the contents stored in the storage means; A private branch exchange apparatus comprising: a switching procedure instructing means for instructing a packet switching procedure; and a switching procedure converting means for converting a packet switching procedure based on an instruction from the switching procedure instructing means.