JPS59105798A - Exchange device - Google Patents

Abstract

PURPOSE:To improve both the using efficiency and the exchange capacity of slots and to reduce the call loss by allotting dynamically these slots in response to the slot allotment request given from each exchange. CONSTITUTION:When an exchange EX has a slot allotment request, a slot allotment request signal is sent to a slot control part SC from an exchange switch part SW via a signal line 701. This request signal is then sent to a trunk line controller SD via a signal line 702, a slot access part SA, a signal line 1D and a control slot CS. The controller SD receives the slot allotment request signal at a transmitting/receiving part SR from a signal line 1a and then transmits it to a processing part PR via a signal line 601. The part PR refers to a table memory TM and allots an unused relay slot RS. This allotment signal is delivered from the part PR and then sent to the exchange EX via the line 601, the part SR and a signal line 1b.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a switching device in which distributed switches are connected by a ring transmission path.

Conventionally, in order to connect multiple distributed exchanges to create a large-scale switching system, multiple exchanges E were used as shown in Figure 1.
)l, EX2. EX3. A relay line (1
) were interconnected. This required a huge amount of wiring work between the exchanges. As a way to solve this problem, as shown in Figure 2, a ring-shaped high-speed transmission line (hereinafter referred to as ring transmission line (2))
A method was considered in which the transmission line was used in a time-division multiplex transmission system and used as a trunk line between exchanges. In the method of FIG. 2, as shown in FIG. 6, a frame (3) consisting of a plurality of slots SL corresponding to the conventional trunk line
2) Orbiting above. In this method, as shown in the figure, for example, EXl-EX2 allocates time slots between exchanges gX1 and EX2, since slots SL are fixedly allocated between exchanges,
There were drawbacks such as the inability to relay more than the number of slots allocated to the exchange and the inefficient use of slots.

This invention eliminates these drawbacks, and instead of fixedly allocating slots to each exchange, it dynamically responds to slot allocation requests from each exchange by adding a trunk line management device. To provide a switching device that allocates slots, improves slot utilization efficiency and switching capacity, and reduces call losses.

Hereinafter, one embodiment of the present invention will be described based on the drawings.

FIG. 4 is a configuration diagram showing an embodiment of the switching device of the present invention, in which a plurality of switching devices EX and a trunk line management device SD are
They are connected by a ring transmission line (2). Figure 5 shows
The format of a frame (3) on a ring transmission path (2) in an embodiment of the present invention is shown.

Frame (3) is a relay slot area R81, R82, etc. for transmitting digital information such as data, audio, 1 image, etc.
... R8 such as R8n, and control slot areas C8I and C82 for transmitting control information such as slot request allocation between the exchange EX and the slot allocation device SD.
,..., consists of CS such as 084.

FIG. 6 shows the configuration of a slot allocation device SD according to an embodiment of the present invention, where SR is a transmitting/receiving unit that uses the control slot C8 to transmit and receive control information such as a relay slot allocation request or allocation, and PR is a slot allocation unit. The processing unit TM that performs allocation requests or allocation processing is a table memory that stores the allocation status of relay slots. FIG. 7 is a configuration diagram of the exchange EX, where 9, SA is a slot access section, SC is a slot control section, and SW is an exchange switch section that connects the terminal T and the relay slot. FIG. 8 is a detailed diagram of the table memo 'JTM.

The operation of the exchange device of the present invention will be described below with reference to FIGS. 6, 7, and 8.

When the exchange EX has a slot allocation request, a slot allocation request signal is sent from the exchange switch unit SW to the slot control unit SC via the signal line (701). This slot allocation request signal is transmitted through the signal line 11 (702), the slot access section IA, the signal line (1d) and the control slot C8.
It is sent to the trunk line management device SD via. The trunk line management device SD transmits the slot allocation request signal to the signal line (1a).
The signal is received by the transmitting/receiving unit SR and sent to the processing unit PR via the signal line (601).

The processing unit PR refers to the table memory TM and allocates an unused relay slot R8. This allocation signal is output from the processing unit PR, and is sent via a signal line (601) to the transmitting/receiving unit SR,
It is sent to the exchange EX via the signal line (1b). Figure 8 shows table memo I used for relay slot allocation control.
This is a diagram showing the same contents of JTM. In the figure, ■ indicates that relay slot R81 is between exchanges EX1 and EXZ, ■ indicates that relay slot R82 is between exchanges Ex1 and ExZ, and ■ indicates that relay slot R83 is between exchanges EX3 and - Ex4 indicates that it is in use, and ■ indicates that the relay slot (R84) is vacant.

Returning to FIG. 7, when the allocation signal arrives at the slot control unit SC via the signal line (1C), the slot access unit SA, and the signal line (706), the slot control unit SC sends the assignment signal to the slot access unit SA. , instructs to perform coupling between each assigned relay slot RS and the signal line (704) of the exchange switch SW, so that information can be transmitted between terminals T by the relay slot.

As described above, the relay slotter R8 is allocated between the exchanges.

The slot allocation is performed from the exchange EX to the trunk line, and its operation is easily understood from the above explanation, so a detailed explanation will be omitted.

In this way, this switching device does not fixedly allocate a decimal number of slots to each switch EX, but instead receives a slot allocation request signal from each switch EX.

A slot assignment release request signal is sent to the trunk line management device SD, and conversely, a slot assignment release signal is sent from the trunk line management device SD to the exchange EXX, thereby allocating the necessary number of trunk slots R8 to the exchange EX. That's what I do. Therefore, all slots can be shared by all exchanges, so there is no longer a problem where other exchanges cannot use the slots due to fixed slot allocation as in the past. This greatly reduces the number of missed calls.

The above example shows the case where time slots are allocated/cancelled based on request signals from exchanges. However, if it is possible to predict the number of time slots to be allocated to connect between exchanges, the processing unit PR can It is also possible to allocate slots semi-fixably between exchanges by sending a slot assignment signal to the exchanges.

As described above, in the switching device according to the present invention, relay slots can be used in common and can be allocated to the required number of switches, thereby reducing connection blockage between switches and improving connection capacity. This has the effect of making it possible to use relay slots effectively.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing a conventional switching device, Fig. 2 is a block diagram showing a switching device using a switching transmission line, and Fig. 6 is a block diagram showing a switching device using a conventional switching device.
FIG. 4 is a configuration diagram showing an embodiment of the switching device of the present invention, and FIG. 5 is a signal format on the ring transmission path of the switching device shown in FIG. 4. An explanatory diagram showing the format, FIGS. 6 and 7 are configuration diagrams showing the details of the trunk line management device SD and the exchange EX in this switching device, respectively, and FIG. 8 shows the contents of the table memory TM in the slot allocation device. It is an explanatory diagram to explain. In the figure, (1) is a trunk line, (2) is a ring transmission path, (3) is a signal format on the ring transmission path, EXl, Ex2. EX3, EX4, etc. EX is an exchange, and SD is a slot allocation device. In addition, in the drawings, the same reference numerals indicate the corresponding parts. Agent Shin Kuzuno −

Claims (1)

[Claims] In a switching device consisting of a trunk line management device, multiple exchanges, and a ring transmission line connecting these, frames including multiple control slots and relay slots circulate on the ring transmission line using a time division multiplexing method. , the trunk line management device includes a transmitting/receiving unit that receives a relay slot allocation request signal or a cancellation request signal and transmits an allocation signal or cancellation signal, a processing unit that performs relay slot allocation or cancellation processing, and a relay slot. and a table memory for storing the status of the slot, and the exchange includes a slot control unit that transmits the assignment request signal or cancellation request signal and receives the assignment signal or cancellation signal, and 1. An exchange device comprising a slot access unit for accessing and an exchange switch unit, and configured to allocate or cancel relay slots.