JP2540941B2 - Hybrid switch - Google Patents

Description

TECHNICAL FIELD The present invention relates to a hybrid type exchange.

[Conventional technology]

As a method for accommodating different types of lines that require different switching operations according to the conventional technology, it is common to group lines of the same type and connect them to different exchanges to perform exchange processing. It was

[Problems to be Solved by the Invention]

According to the above-described method of performing exchange processing by a plurality of exchanges, lines are grouped in advance for each line type, and in order to change the line type later, it is necessary to physically change the line connection. It takes time and effort. Further, since each switch has peripheral hardware attached to the switch, there is a problem that the amount of hardware becomes large and the cost becomes high.

[Means for solving the problem]

The hybrid type exchange of the present invention includes a line that accommodates only one high-speed channel in a fixed frame format on the line, a line that accommodates a large number of relatively low-speed channels by multiplexing, and an address that indicates the destination at the beginning. A high-speed channel switch that performs a switching process corresponding to each of a line that accommodates a plurality of cells with different destinations for a cell that has a header containing Low speed channel switch,
Although the cell switch is equipped with three types of switches and high-speed channels are accommodated, high-speed channel exchange processing is not performed, and exchange operation is not performed for each low-speed channel or each individual cell. The high-speed channel switch for performing the switching operation is arranged at the forefront, and the low-speed channel switch for performing the switching operation for each low-speed channel and the line in which a plurality of cells having different destinations are multiplexed in the subsequent stage This is a configuration in which a cell switch that performs an exchange operation for each cell is arranged.

〔Example〕

 Next, the present invention will be described with reference to the drawings.

Referring to FIG. 1 showing an embodiment of the present invention, the line group 1 is intermingled with lines requesting various switching processes. The line interface 2 terminates the line and replaces it with an easy-to-handle type internal interface. The high-speed channel switch 3 performs a switching process for a line in which only one high-speed channel is accommodated in the frame. That is, a logical connection is made between the incoming line and the outgoing line, and the inputted digital information goes out transparently. The low speed channel switch 4 is a switch for exchanging each low speed channel multiplexed in a frame for each channel, and is composed of, for example, a time division switch. The switch 4 performs an exchange operation by putting data of a specific channel of the incoming line into a position within a required time slot on the outgoing line side and putting it out. The cell switch 5 is a switch for performing an exchange process on a cell composed of a header section for storing fixed-length destination information multiplexed in a frame of a line and a section for accommodating fixed-length information. The switch 5 has a function of looking at the destination information of the input cell and outputting it to the line corresponding to the destination. Of the lines accommodated in this exchange, those which accommodate high-speed channels are first converted into internal link interfaces by the line interface 2, then connected to the outgoing line by the high-speed channel switch 3, and then passed through the line interface 2 again. Connected to the outgoing line. For lines that accommodate low speed channels,
All are connected to the low speed channel switch 4 by the high speed channel switch 3. That is, the data from the line accommodating the low speed channel is transferred to the line interface 2
And enters the low speed channel switch 4 by the connection established by the high speed channel switch 3 on a line-by-line basis. The low speed channel switch 4 exchanges each low speed channel and outputs it to the internal link on the output side. The output data is again connected to the outgoing line via the high-speed channel switch 4 and the line interface 2. The exchange process for cells is similar to the exchange for low speed channels. Line interface 2
Is connected to the cell switch 5 via the high-speed channel switch 3 in line units, and the cell switch 5 performs exchange processing in cell units. When the type of the line accommodated in this exchange is changed, the desired exchange processing can be performed only by changing the connection to the switch at the subsequent stage secured by the high-speed channel switch.

〔The invention's effect〕

As described above, according to the present invention, since the high-speed channel switching function by the high-speed channel switch and the connection changing function for the switch can be used together, it is possible to easily cope with the change of the line type.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention. 1 ... Line group, 2 ... Line interface, 3 ... High-speed channel switch, 4 ... Low-speed channel switch, 5 ...
... cell switch.

Claims (1)

(57) [Claims] 1. A line for accommodating one high-speed channel in a fixed frame format, a line accommodating a plurality of low-speed channels, a fixed-length information section, and a header for indicating the destination of information at the head section. A different exchange process is performed for each line that accommodates a plurality of fixed-length cells that are multiplexed, and a channel exchange operation is performed for the line that accommodates the high-speed channel. For the line accommodating the channel and the line accommodating the cell, a high-speed channel switch is arranged at the forefront stage for performing an exchange operation for the entire frame format rather than an exchange operation for the individual channel and individual cell. In the latter stage, a low-speed channel switch that performs switching operation for each low-speed channel and the destination A cell switch for performing a switching operation for each different cell is arranged, and the above-mentioned three types of lines requesting different switching processes are connected without being aware of the line type to perform the switching process for the required information. Hybrid type exchange.