JPS58169610A - Connection control system of input and output device - Google Patents

Abstract

PURPOSE:To support plural channels with the same transmission line and to realize an economical operation, by multiplexing the transmission on a series transmission line and at the same time allotting dynamically the channel corresponding to a high-speed transmission mode. CONSTITUTION:Channel interfaces 4-1 and 4-2 are provided to a remote station adaptor 3 and connected to channels 2-1 and 2-2 respectively. A multiplexing circuit 25 prevents one of channels 2-1 and 2-2 from shifting to a high-speed transmission mode when the other starts its working in the high-speed transmission mode. Input/output interfaces 19-1 and 19-2 are provided to a remote station adaptor 14 at the side of an input/output device 24. A buffer 18 as well as a buffer 6 are controlled by a multiplexing circuit 26 so as to be exclusive to the high-speed transmission mode.

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Technical Field of the Invention The present invention relates to an input/output device connection control device, particularly in a system that uses a remote station adapter to connect a general-purpose channel device and an input/output device over a long distance. By using a station adapter, an input/output device can be connected to multiple channel devices, and a pair of remote station adapters can support a high-speed input/output device and a low-speed input/output device to enable multiple use. This relates to an output device connection control method.

(Background and Problems) When input/output devices and general-purpose channel devices are located far apart, it is recommended to connect them using a high-speed, high-quality serial transmission path such as an optical cable. A remote station adapter is used.

FIG. 1 shows an example of a connection using a conventional remote station adapter, and FIG. 2 shows an example of a data format transferred between conventional remote station adapters. In the figure, 1 is a data processing device, and 2 is a channel.

3 is the remote station adapter on the channel side.

4 is a channel interface, and 5 is a transfer control unit.

6 is a buffer, 7 is a parallel-to-serial converter, 8 is a transmission frame control unit, 9 is an electrical/optical converter, 10 is an optical/electrical converter,
11 is a reception frame control unit, 12 is a serial/parallel converter, 1
3 is a serial transmission via optical fiber fij1w t' is a remote station adapter on the input/output device side, 1B is an optical/electrical converter, 16 is a reception frame control unit, 17 is a direct transmission
Parallel converter, 1B is a buffer, 19 is an input/output interface, 20 is a transfer control unit, 21 is a parallel/direct converter@, 22 is a transmission frame control unit, 23 is an electrical/optical converter, and 24 is an input/output device. .

For example, data transfer from the channel 2 side to the input/output device 24 is explained as follows. Is the channel 2 activated by the data processing device 10 input/output command transferring data? It is sent to the channel interface 4 of the remote station adapter 3. The data input to the channel interface 4 is under the control of the transfer control section 5.

The signal is buffered in a buffer 6 according to the type of transmission mode, and converted into a serial signal by a parallel/serial converter 7. Next, the serial data is transmitted by the transmission frame control unit 8.
The signal is configured into a transmission frame as described later, is converted into an optical signal by an electrical/optical converter 9, and is output to a serial transmission line 13 using an optical fiber.

This signal is sent to the remote station adapter 14, converted back into an electrical signal by the optical-to-electrical converter 15, and input to the reception frame control section 16. The reception frame control section 16 reads the control signal of the transmission frame, and sends the result to the serial/parallel converter 17. The data is converted into a parallel signal by the serial/parallel converter 17, and then sent to the transfer control section 20.
The data is buffered in the buffer 18 as necessary under the control of the input/output interface 1et-, and is input to the input/output device 24 via the input/output interface 1et-. The input/output device 24 processes the transferred data in exactly the same way as if it were directly output from the channel 2. The same applies to the case where data is transferred from the input/output device 24 to the channel 2.

In the transmission mode between the remote station adapter 3 and the remote station adapter 14, each signal line of the interface is sampled.

There is a first mode that faithfully reproduces this, and a second mode that performs high-speed transmission.

Remote station adapter 3t or 14.

The first mode is used for starting and terminating input/output operations, data transfers in block multichannels, asynchronous interrupts, etc., and the second mode is used for burst transfers in block multichannels, etc., thereby speeding up transfers. We are trying to FIG. 2(C) shows an example of a transmission frame in the @1 mode, and FIG. 2(C) shows an example of a transmission frame in the second mode.

In the conventional device, the first mode and the second mode described in h are divided into one, and a long-distance connection for one channel can be realized with one reciprocating transmission path. However, in such a conventional system, two or more transmission lines and a plurality of pairs of remote station adapters are required in the case of the ninth order, making it difficult to operate economically. In other words, when an input/output device is cross-called from two channels, when switching between two channels is used in response to a channel failure, or when an input/output device is installed on the side of a remote stage, for example, a magnetic tape. For example, a device that operates at high speed and is connected to a block multichannel, such as a device, and a device that is connected to a byte multichannel, such as a keyboard printer, are installed.

(3) Purpose of the Invention The present invention aims to solve the above-mentioned problems, and realizes a low-cost system that can support multiple channels on the same transmission path without impairing the high speed provided by the second mode. The aim is to make it possible.

(4) Structure of the Invention In order to achieve the above object, the present invention multiplexes and transmits data of two channels on the same transmission path.

In addition, consideration is given to giving priority to transmission in the second mode. That is, the input/output device connection control method of the present invention connects a remote station adapter connected to a channel device and a remote station adapter connected to a turnout device via a serial transmission line, and connects the channel device and the input/output device. In the system, the remote station adapter on the channel device side is provided with at least two channel interfaces and a multiplexing circuit and is connected to the plurality of channel devices, and the remote station adapter on the input/output device side is connected to the plurality of channel devices. The remote station adapter is equipped with at least a multiplexing circuit and two input/output interfaces, and is configured to be connected to different input/output devices, and the transmission on the serial transmission path is multiplexed on the serially transmitted signals. The system is characterized in that it dynamically allocates channels corresponding to transmissions that use a high-speed transmission mode of operation. This will be explained below with reference to the drawings.

(5) Embodiment of the Invention FIG. 3 shows the configuration of an embodiment of the invention, FIG. 4 shows an example of a transfer data format according to the invention, and FIG. 5 shows a detailed explanatory diagram of the invention.

In the figure, code 1. 3.5 to 18, 2Q to 24 correspond to @1 figure, 2-1 and 2-2 are te'rne h, 4
-1 and 4-2 are channel interfaces, 19-1
and 19-2 are input/output interfaces, 25 and 2
6 represents a multiplexing circuit.

The remote station adapter 3 is provided with a first channel interface 4-1 and an IJ/E2 channel interface 4-2.
-1. :' connected to the second channel 2-2. These circuits share 91 sets of buffers 6, parallel/serial conversion circuits 7, and other circuits through a multiplexing circuit 25. Data transfer from each channel interface 4-1 or 71j 4-2 can be sent in the first or second transmission mode.

For the second mode, the first before the second channel 2
-1.2-2 is controlled to be exclusive. That is, the multiplexing circuit 25.

When one channel 2-1 or 2-2 starts operating in the second transmission mode first, a signal is sent to the channel interface 4 to prevent the other channel from shifting to the second transmission mode.
-1 or 4-2.

By doing so, it becomes possible to avoid conflicts in simultaneous use of a set of buffers 6 and to share them.

On the other hand, the first input/output interfaces 19-1 and 1 are also connected to the glue motor stage adapter 14 on the input/output device 24 side.
! 2 input/output interfaces 19-2 are provided.

These are the first channel interfaces 4-
1 and the second channel interface 4-2 particularly correspond to each other. However, the first and second input/output interfaces 19-1, 19-2 do not necessarily have to be connected to different input/output devices, but may be connected to a single 0 input/output device 24. As for the buffer 18, similarly to the buffer 6, for the second transmission mode,
The multiplexing circuit 26 exclusively controls the first transmission mode, which is the same as the first transmission mode, and the 10th transmission mode and the 20th transmission mode, which can be multiplexed. Multiplexing with the same gzo transmission mode as the transmission amount of jlIx is suppressed.

Due to the rounding of the multiplexing circuit 25 or 26 on the receiving side, a code identifying the channel is added to the transmission frame as shown in FIG. The illustrated transmission frame is a frame according to the 10th transmission mode, and contains sample values of each signal of the channel interface.

No. 451: The illustrated transmission frame is a frame according to the second transmission mode, and is composed of transfer data and a signal indicating the operating state of the buffer O status Wintaface. As a result, in burst transfer, the empty state of the buffer is checked in the second transmission mode, and high-speed transfer is performed. Note that whether it is the 10th transmission mode or the 20th
Whether the frame is a transmission mode is determined by a bit in the frame indicating the transmission mode.

When one side enters transfer in the second transmission mode, the transmission frame in the Ill transmission mode is 1/4 to 1/lo 81 degrees of the exit frame so as not to reduce the throughput in the *** transmission mode. Reduced by building weight.

Even with such a process, when the transmission distance is 10 or more, the operating speed of the first transmission mode in the interrotter format is hardly affected.

The structure of the present invention can be applied, for example, as shown in FIG. FIG. 5 shows a device 24-1 connected to two interfaces 27-1.2 to a high-speed device, such as a magnetic tape device.
7-2' to the remote stage 14,
When connected to the NioNori motor stage adapter 3 and linked to channel 2-1 of critical condition 1 and channel 2-2 of critical condition 1, it is in a state of tyranny. By doing this.

For example, during burst transfer, the status etc. can be sensed from the other channel, and even if one channel fails, it is possible to access normally from the other channel.

Figure 5 @ shows remote station adapters 3 and 14
The first channel 2-1 and the high speed input/output device 24-
1, channel 2-2 of critical condition 2 and low-speed input/output device z
4-2 and gold are respectively shown.

Since one round-trip transmission line is used by multiplexing signals, an economical system can be constructed.

(6) Detailed Description of the Invention According to the present invention, the following effects can be obtained by simply adding a few circuits to the conventional transmission line and control circuit of the transmission speed.

(2) It is possible to squall t-2 channels such as a magnetic tape device placed on a remote stage using a pair of remote stage adapters.

■ One input/output device can be connected to two channels, allowing backup switching in the event of a channel failure. ■ A pair of high-speed input/output devices and low-speed input/output devices that perform burst transfer are connected to separate channels, respectively. Can be connected with a glue cage and tosstion adapter, and can share the transmission path.

[Brief explanation of the drawing]

Fig. 1 shows an example of a connection using a conventional remote station adapter, Fig. 2 shows an example of a conventional transfer data format, Fig. 3 shows the configuration of an embodiment of the present invention, and Fig. 4 shows an example of a transfer data format according to the present invention. For example, FIG. 5 shows a detailed explanatory diagram of the present invention. In the figure, 1- is a data processing device, 2 is a channel, 3 is a remote station adapter, 4 is a channel (interface), 13 is a serial transmission line, 14tli134 19 is an input/output interface, 24 is an input/output device, and 25 and 26 are multiplexing circuits. Patent applicant: Fujitsu Limited.

Claims (1)

[Claims] In a system configured to connect a remote station adapter connected to a channel device and a remote station adapter connected to an input/output device via a serial transmission path, and to perform data transmission between the channel device and the input/output device, The remote station adapter of the channel interface is provided with at least two channel interfaces and a multiplexing circuit and is connected to a plurality of channel devices, and the remote station adapter on the side of the human output device is equipped with at least two multiplexing circuits and two channel devices. The transmission on the serial transmission path is multiplexed on the serially transmitted signals and is transmitted and received, and the transmission uses a high-speed transmission operation mode. An input/output device connection/installation system characterized by dynamically allocating channels corresponding to the input/output device.