JPS5919676B2 - Early dial detection method - Google Patents

Description

[Detailed description of the invention] The present invention relates to early dial detection schemes.

In a crossbar private branch exchange, when a call is made from an extension telephone to a private line or a trunk line for a leased line, the exchange receives the first dial digit that identifies the call as a trunk line call, and immediately calls the trunk line. If the connection is changed to the trunk and the numbers below the second number are directly relayed to the trunk line by the trunk, the originating register in the exchange is the first one.
If the subscriber dials the second digit after receiving the digits but before the connection change is completely completed, the first part of the dialing signal for the second digit will be missing, resulting in an erroneous connection.

This connection operation will be explained with reference to the drawings.

FIG. 1 shows a diagram in which a dialing register receives a trunk line calling identification number dialed from an extension telephone, activates a marker, connects the extension telephone to the trunk of the trunk, and thereafter sends a dial signal from the extension telephone. FIG. 2 is a relay system diagram of a crossbar type private branch exchange configured to directly relay the information to the trunk line via the trunk, and is a diagram showing the connections of the main parts of a conventional calling register used in the above exchange.

In FIG. 1, when the extension telephone EX makes a call (off-hook), the marker MKR is activated via the line circuit LRG as is well known, and the marker MKR connects the extension telephone EX via the path 1 of the line link frame LLF to the calling register. O
Connect to R and restore.

That is, the extension telephone EX is connected to the relay A of the outgoing register OR via the line circuit LRG) and the line link frame LLF, as shown in FIG. Outgoing register O
In R, relay A is ground, winding ■, path 4 of line link frame LLF, line circuit LRG) extension telephone EX) line circuit LRG) line link frame LL
'F path 4, winding I) Operates on the battery circuit (telephone EX loop), closes contact a, connects the transmitting sound source DT to the winding of relay A through contacts a and mst, and emits the transmitting sound DT. is induced from the winding of relay A to winding 1, and the extension telephone EX
reach. When a dial is made on the extension telephone EX, relay A in the calling register 0R is intermittently restored in response to the dialed digits, as is well known, and the number of dials is counted by means not shown, and the counted value is calculated for each dialed digit. (for each digit).

When calling another extension telephone from the extension telephone EX, when a predetermined number of digits (for example, 4 digits) have been accumulated corresponding to the number of the called extension telephone, a power-activated relay MST (not shown) is activated in the calling register 0R. operates, thereby activating the re-shared marker MRK, transferring the already stored called extension telephone number to the marker MKR, and the marker MKR, as is known, connects the calling extension telephone EX and the called extension telephone Connection is made via a link frame LLF and an intra-office trunk (IOT), not shown, to enable communication. When making a call to a trunk line such as a private line or a leased line (extension telephone EX), it is stipulated that a certain trunk line calling identification number, for example ``7'', be dialed as the first digit.
Now, if the identification number "7" is dialed as the first number, it will be identified in the calling register 0R and the marker MKR will be activated immediately. In this case, the above identification number 171 is transferred to the marker MKR, and based on this, the trunk PTRK for the trunk line L for a private line or leased line is captured, and the calling extension telephone EX is linked to the line. The trunk PTRK via path 2 of frame LLF
Change the connection. For this, call extension telephone EX
The dialed digits after the second digit are sent to the trunk line L via the trunk PTRK without passing through the calling register 0R. In the above, when the transmission register 0R activates the marker MKR゜, the marker activation relay M (not shown)
ST operates, activates marker MKR, and calls extension telephone E.
It is held until the connection change to the trunk PTRK of X is completed. During this time, the winding of relay A, contact A, m8t
, resistor r1, and battery are closed, and the relay holds the winding 1, independently of the winding, thereby V1 relay A
However, depending on the state of the extension telephone EX1 line link frame LLF, the marker MKR activation core is prevented from operating unintentionally, and the number accumulated in the transmission register 0R is prevented from being disturbed. Therefore, when the trunk originating identification digit "7" is received as the first digit, the calling extension telephone EX receives the second digit before the connection change to the trunk trunk PTRK is completed.
When a digit is dialed, at least initially it disappears in the originating register 0R, and an erroneous digit is transmitted to the trunk L via the trunk trunk PTRK, resulting in an erroneous connection.

As mentioned above, conventionally, in the case of a trunk line call, there was a drawback that dialing the second digit following the first digit too early, that is, early dialing, would result in an erroneous connection.

The present invention provides a system in which, in a crossbar type private branch exchange as described above, in the case of a trunk line call, a dial signal issued by an extension telephone is directly relayed to the trunk line via the trunk of the trunk line, without using a register center. , to detect early dialing and thereby prevent false connections. Next, the present invention will be explained with reference to the drawings. FIG. 3 shows an example of the connection of a calling register, a marker, and a trunk for a trunk line in which the present invention is implemented, and shows the corresponding parts of the exchange shown in FIG. The connection configuration is as follows.

Note that publicly known parts that are less relevant to the understanding of the present invention are omitted from the drawings. In FIG. 1, when the extension telephone EXK makes a call, it activates the marker MKR in exactly the same way as described above, and the extension telephone EX is connected to the origination register 0R via path 1 of the line link frame LLF, and then the marker MKR is activated. Recover.

In one embodiment of the invention, the outgoing register 0R is the third
With the connection configuration shown in the figure, when the calling extension telephone EX is connected via the path 1 of the line link frame LLF, the loop of the telephone EX causes the relay A to connect its winding 1,
A current flows and it operates. When the contact point and mother-in-law switch, the slow recovery relay B operates, and the contact point aτ closes, and the contact point Mst,
Connect the transmission sound source DT to the winding of relay A1 via af,
The dial tone is guided from the winding of relay A1 to winding 1, and reaches the calling extension telephone EX. The calling extension subscriber connects to the trunk line L, such as a private line or dedicated line, so the
Dial a fixed identification number such as "7" as a number. 67″ dial restored relay A intermittently 7 times,
The number of times of recovery is counted in a known manner, and the transmission register 0
The first number in R is stored in a storage relay group (not shown).

At this time, only when the identification number 7 is stored in the storage relay group, the terminal 1N is given air and the relay POG (trunk line transmission display relay) is activated. Note that when relay A1 is restored at the first pulse of the dial, slow recovery relay c is activated via contacts a{ and b1.

Relays B and C are slow recovery, and relay B is similar to relay A.
It works like the operation in 1, and it is held even while dialing is being received.
Relay C is activated upon reception of the first pulse of the dialed digit, held during the dialed digit, and restored when the maple contact al is activated and enters the b state upon completion of the dialed digit. After the first pulse of the first number is received (when relay C is activated), the transmission sound source DT is shut off in a known manner. In addition, in the transmission register 0R, the trunk line transmission display relay PO
When G operates, its own contact POgl closes, and contact B
Since 2 is closed, it will be maintained even after the terminal IN disappears,
Note that marker activation relay MST is activated by the operation of relay POG.
operates, and at this time, if there is no conflict of marker activation between other devices in this transmission register 0R, a conflict prevention relay RP (not shown) operates, and by the operation of relays MST and RP, marker MKR is activated from this transmission register 0R. is started.

During this start-up operation, if the second digit dial of the calling extension telephone is not sent to this calling register 0R, the marker α is operated as described above to capture the vacant trunk trunk PTRK. Line link frame LLF
2, connect the calling extension telephone EX to the trunk PT.
Change the connection to RK, and after completing this connection change, mark M.
Marker activation relay MS of the transmission register 0R from KR
T is restored, the transmission register 0R is released and restored, and the marker MRK is also restored.

In the trunk trunk PTRK, winding 1 of relay A2
, is contact 1? D, '8, line link frame L
(via the loop of the calling extension EX via path 2 of LF').

The dial pulse sent from the second numeral telephone EX is received by the relay A2 and relayed to the trunk line L as is known in the art. This relay can be performed in a known manner, so a description thereof will be omitted. Assume that the second digit is dialed from the call register 0R on the calling extension telephone EX while the marker MKR is activated as described above.

Marker MKRf) causes the simulator R to reconnect the calling extension telephone EX to the trunk trunk PTRK in exactly the same manner as described above. At this time, the contact POg2 is open and the winding of the relay A1 has no current. The first pulse of the second number is sent out, which causes relay A1 to recover, contact a
} , bl, relay C operates. This closes contact C1, activates early dial display relay FDL via contact c1 and POg3, and holds contact c1 even after opening via contact B3 and self-contact Fdl. In addition, R
Reference numeral 2 denotes a resistor used to flow current through the winding of relay A1 when contact PO is not opened during extension connection. When the marker MKR is activated from the transmission register 0R as described above, the identification number "7" stored in the first number storage relay group is transferred to the marker MKR as is well known, and the marker MKR also identifies this and relays it to the marker MKR. Operate POGl. By closing the contact POg\, the relay F of the trunk trunk PTRK captured by the marker MKR is activated. In addition, at this time, the air given to relay FDL via contacts B3 and fdl is sent to contact R of conflict prevention relay RP of transmission register 0R, which is operating at this time, as early dial detection information.
It reaches the marker MKR via the contact point POgI of the marker MKR, is transferred to the trunk trunk PTRK, and operates the relay LO via the contact f of the activated relay F.

As mentioned above, the calling extension telephone EX passes through route 2 of the line link frame LLF under the control of the marker MRK,
When the connection is changed to the trunk trunk PTRK, the telephone line extending from the calling extension telephone EX connects to the contact point 81 in the trunk PTRK. It is blocked by g. When the telephone line is cut off, a line lockout provided in the line circuit LRG in a known manner isolates the active L calling extension telephone EX from the exchange in the line circuit LRG and sends a busy tone to the telephone.

In the trunk trunk PTRK, the calling extension telephone EX
The relay A2 operated by the loop is restored because its operating circuit is cut off at the contact 'Dj, and the trunk trunk PTRK is thereby restored. Therefore, the connection path of path 2 of line link frame LLF is also released. In this case, the calling extension telephone EX dials the second digit, hears the busy tone, and then makes the call again.

Since the present invention is configured as described above, in a crossbar type private branch exchange, when making a trunk line call, the extension telephone is
The trunk line originating identification digit dialed as the first digit switches the connection from the calling register to the trunk line trunk, and furthermore, the dialing signal from the extension telephone (extension telephone) is directly relayed to the trunk line via the trunk line without using a register center. In this method, an early dial sent out before the above-mentioned connection change is completed is detected, which has the effect of preventing erroneous connections.

Figure 1

[Brief explanation of the drawing]

Fig. 1 is a relay system diagram of a general crossbar type private branch exchange in which the present invention can be implemented, Fig. 2 is a connection diagram showing the connections of the main parts of a conventional transmission register used in the exchange of Fig. 1, and Fig. 3 FIG. 1 is a connection diagram showing connections of essential parts of a transmission register, a marker, and a trunk trunk according to the present invention, which is also used in the exchange shown in FIG. EX...Extension telephone, LRG...Line circuit, LL
F...Line link frame, MKR...Marker,
PTRK... Trunk for trunk line, L... Trunk line, 0
R...Outgoing register, A, Al, A2, B, C, PO
G, FDL, F, LO...Relay winding, lowercase letters are the corresponding relay contacts.

Claims (1)

[Claims] 1 After receiving the trunk line calling identification number dialed from the extension telephone, the calling register activates the marker, connects the extension telephone to the trunk of the trunk line, and thereafter transmits dial signals sent from the extension telephone to the trunk. In a crossbar type private branch exchange configured to relay directly to a trunk line via When this occurs, the marker is activated from the dialing register, and the marker thereby reconnects the extension telephone to the trunk of the trunk line, and when the reconnection is completed,
When the calling register is restored, the calling register is also restored, and the calling register is configured to detect a dial signal sent from the calling extension telephone as an early dial while the calling register is activating the marker when making a call to the trunk line. and this early dial detection information is transferred from the calling register via the activated marker to the trunk trunk connected to the calling extension, which trunk trunk connects to the calling extension with this information. An early dial detection method characterized by line lockout.