JPS61214651A - Digital exchange equipment - Google Patents

Abstract

PURPOSE:To confirm visually the secured state of a data link area by connecting plural sets of network terminals to one set of digital subscriber line controller, respectively, and connecting plural sets of terminal equipments to each network terminal. CONSTITUTION:One telephone set 311 of a terminal equipment is brought to off-hool, a 'transmission request' signal SEND is generated, the synchronization of a transmission line is taken, and when it is confirmed that a physical area has been secured, an 'active indication' signal AI is sent back and a 'physical active indication' signal PH-AI is generated, and a layer 1 is secured. Subsequently, a signal S-ABM is generated from a terminal equipment TE side, and a telephone number is also transmitted simultaneously. In response to it, a UA signal is sent back from a digital subscriber line controller 131, and a layer 2 is secured. In this way, it becomes possible to shift to a layer 3, actual data transmission is executed, the state of the layer 2 can be confirmed visually, and maintenance, inspection, etc. can be executed efficiently.

Description

[Detailed Description of the Invention] [Summary] A digital switching device (system) in a digital comprehensive service network that attempts to establish a transmission path in response to a call originating from a terminal device according to a procedure based on the recommendations of CCI TT. , the establishment of a data link area is made visible by displaying at least the fact that a state in which a data link is possible has been established.

[Industrial application field]

The present invention relates to a digital switching system, and more particularly to a digital integrated service network (l5DN).
:Integrated 5service@D1gi1
3lNatvrork).

[Prior art and problems to be solved by the invention]

15DN is a digital communication network that provides a wide variety of services such as telephone, data, facsimile communication services, and communication processing services that process communication information, and its processing methods are based on the recommendations of CCITT. For example, when a call is made from a terminal device such as a telephone, the procedure for establishing a transmission path is as shown in Figure 2, from layer 1 (LYRI) to layer 3 (LYR).
Step by step proceed to 3). Layer 1 indicates a stage in which transmission paths are synchronized and a physical area is established in response to a call from a terminal device. Layer 2 is the stage that enables further data links. Layer 3 shows the state in which actual data can be distributed.

Although the layer establishment described above is performed by the computer in the digital switch, the results are only stored in the computer's memory, at least not in a way that is easily visible. Therefore, if an appropriate response result is not obtained even though the button is used to initiate a call from the terminal device, it is extremely troublesome to investigate the cause. Such situations may occur during manufacturing tests and inspections of the digital switching system, as well as during maintenance and maintenance during use.
The same applies to inspections.

[Means to solve the problem]

FIG. 1 shows a principle block diagram of a digital switching device according to the present invention.

In FIG. 1, the digital exchange system includes a digital exchange (ET) 1, a network terminal 21, and terminal devices 31 to 3m'(7').
is multiple Dinotal subscriber line controllers :)13
The digital subscriber line controller shell 13 is comprised of a plurality of groups, each group being 1 to 13n1.

Each digital subscriber line controller 131-1
34 is provided with layer-2 status display ports 141 to 14n.

As shown in FIG. 1, each digital subscriber line controller 131 has a plurality of network terminals (N
TIII~NT11m)2It~21m may be connected. Further, a plurality of terminal devices (TE, '!31. to 31t) can be connected to each network terminal 21t. Examples of the terminal devices (TE) include telephones, facsimile machines, and the like.

[Effect]

This digital switching equipment responds to a call from a terminal device, sequentially establishes a physical area for a transmission path, establishes a data link area, and performs all data transmission.

At least the state in which the data link area is established is made known.

〔Example〕

Embodiments of the invention will be described below with reference to the accompanying drawings.

FIG. 2 shows a configuration diagram of a digital switching system in one station of an I5DN as an embodiment of the present invention. Second
In the figure, the digital exchange system is a digital exchange (ET) 1. It has a network terminal 21 and terminal devices 31-34. The digital exchange 1 includes a line processor (LPR) 11. A digital subscriber line interface shell 12 comprising a plurality of digital subscriber line interfaces (DLIFl-DLIFn) 12t to 12n connected to the line processor;
A digital subscriber line controller shell 1 consisting of a plurality of groups each including four digital subscriber line controllers 131 to 134 connected to each of the
3' tail.

Each digital subscriber line controller 131-1
34 includes a layer-2 establishment circuit 91 as shown in FIG.
, a D-type flip 70 tube 92, a light emitting diode 93, and a resistor 94 are connected as shown in the figure, and layer-2 status display circuits 141 to 144 are provided.

As shown in FIG. 2, one digital subscriber line controller 13! 4 network terminals (NT
Ill-NTIIa) 21t to 214 may be connected. In addition, each network terminal 211 has four terminal devices (
TE)31. ~314 may be connected. Terminal equipment (TE
) include telephones, facsimile machines, etc.

The operation of the circuit shown in FIGS. 2 and 4 is fully described below.

Figure 5 is a chronological diagram of the establishment procedure of layers 1 and 2, and the detailed protocol is based on CCI.
Based on the TT Recommendation, FIG. 5 is shown schematically. In FIG. 5, TE indicates the terminal device side, ET indicates the Dinotal exchange side, and L1 to L3 indicate the establishment operations of layers 1 to 3, respectively.

First, one telephone 311'i of the terminal device is off-hook and a "send request" signal 5END'ft is issued. An "active request" signal AR is issued from the network terminal 211i to the digital subscriber line controller 131.

When the digital subscriber line controller 13 verifies through firmware processing that the transmission lines are synchronized and the physical domain is established, it returns an "active invocation" signal A[-.

This causes the "physical active invocation" signal PH-AI to be issued and layer 1 (LYRI) to be established.

Next, the process moves to the establishment operation of layer 2 (LYR2).

Terminal equipment [from TE side r S-ABM (Set-Asy
(chronous balanced mode)
J signal S-ABM is issued.

At this time, a phone number will also be sent to you. In response, the digital subscriber line controller 131 sends U A
(Unnumber@d ackndedg*m5n
t) send back a signal. This causes a "confirmation instruction" signal EST-ID to be issued, indicating that layer 2, ie, an area where a data link is possible, has been reached. On the other hand, the Dizotal subscriber line controller 131 is S-AB
Upon receiving M tl-, EST-ID is issued.

This makes it possible to move to Layer 3 (LYR3), where actual data transmission takes place.

On the other hand, in response to receiving the "confirmation instruction" signal EST-ID, the digital subscriber line controller 13! The display output/main pulse DSP is applied from the layer-2 establishment circuit 91 in the inner layer to the D input terminal of the D type flip-flop f92, and the write clock/9 pulse WCKK is applied to the fiD type flip-flop 92. Therefore, the D-type flip-flop 92
Since the Q output terminal of the light emitting diode 93 becomes low level, the light emitting diode 93 lights up.

This makes it visible that layer 2 has been established.

If the layer 2 state ends, the display output pulse DSP is again output from the layer 2 establishment circuit 91 to the 7-lip flash drive 92, and the light emitting diode 93 is turned off.

In the above embodiment, one digital subscriber line controller provides 16 status displays, and multiple digital subscriber line controllers require a considerable number of light emitting diodes, which takes up considerable space. I need.

To reduce this space, a flip-flop 92. as shown in FIG. ~924 and light emitting diode 93
Switching circuits 951 to 9 between 1 and 934, respectively.
5. j may be provided so that any one of the switching signals SLI to SL4 is on can be displayed.

Incidentally, the D-type flip-flops in FIGS. 4 and 6 can be replaced with ordinary set/reset type flip-flops. In this case, an output pulse gold is applied to the sector terminal when layer 2 is established, and a reset signal is applied to the reset terminal when layer 2 is completed.

It is also possible to display layer 2 on the network terminal 21 and terminal devices 31 to 34 side. That is, in FIG. 5, when all the UA signals are received and the EST-ID signal is received, the same display as above can be performed.

In the above implementation fl, the status display of layer 2 has been described, but it is possible to display all the statuses of layer 1, layer 3, or even higher layers. The status display is not limited to light emitting diodes, but may also be displayed using other display means, such as liquid crystal.

〔Effect of the invention〕

As described above, according to the present invention, the state of at least layer 2 can be visually recognized, and maintenance, inspection, etc. can be performed efficiently.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of the principle of a digital switching device according to the present invention. FIG. 2 is a block diagram of a digital exchange system as an embodiment of the present invention, and FIG. 3 is a diagram showing the structure of layers in the system shown in FIG. 4 is a diagram showing an embodiment of the layer-2 status display circuit in the digital subscriber line controller in the system shown in FIG. 2; FIG. 5 is a diagram showing the operating procedure of the circuits in FIGS. 2 and 4; FIG. 6 is a diagram showing another embodiment of another layer-2 status display circuit according to the present invention. (Explanation of symbols) 1... Dinotal exchange, 11... Line processor, 12... Digital subscriber line interface, 13... Digital subscriber line controller,
DESCRIPTION OF SYMBOLS 14... Layer-2 status display circuit, 21... Network terminal, 31-34... Terminal device, 91... Layer-2 establishment circuit, 92... D-type flip f70. 93... Light emitting diode, 94... Resistor, 951
~954...Switch circuit.

Claims (1)

[Scope of Claims] 1. A plurality of digital subscriber line controllers (13
a digital switch (1) having digital subscriber line controllers (13_1 to 13_n);
A plurality of network terminals (21_n) connected to each of the network terminals (21_n)
1 to 21_m) and the network terminal (21_1 to 2
A plurality of terminal devices (31_1) connected to each of
-31_l, 3_m__1-3_m__l), and the terminal device (31_1-31_l, 3_m__1-3_
A digital switching device that sequentially establishes a physical area for a transmission path, establishes a data link area, and performs data transmission in response to a call from a subscriber line controller. (13_1
~13_n), the status display circuit (14_1~14_n)
_n) to inform at least the state that the data link area has been established.