JPS61242438A - Transmission system for network control signal - Google Patents

Abstract

PURPOSE:To eliminate deterioration in multiplex efficiency by stealing state information bits and transmitting a network control signal with them when a frame bit is at a level 1 periodically. CONSTITUTION:The network control signal from a data terminal 4 is inputted to a state signal inserter 6-1. Further, a frame pulse generator 9 generates and sends a pulse to the state signal inserter 6-1 when frame bits of a frame signal from a frame pattern generating circuit 8 which have frame numbers 3, 8, 13, 18... have the level 1. Then, the state signal inserter 6-1 seals a state information bit when the pulse is inputted and superimposes the network control signal, and a frame inserter 7 inserts and transmits a frame signal. When the frame bits having the frame numbers 3, 8, 13, 18... have the level 1, a reception side extracts the state information bit as the network control signal. In this case, the network control signal varies between 0 and 1 alternately, so the state information bit is regarded as discontinuous 1-bit errors, but those discontinuous 1-bit errors do not causes a protecting circuit to malfunction, so that they are received as the network control signal.

Description

[Detailed Description of the Invention] [Summary] In a byte-based data transmission system in which one of the envelopes is used as a frame bit and other status information bits, the frame bit periodically transmits the status information bit when it is at level 1. This method eliminates the need for a dedicated channel for network control signals and prevents deterioration of multiplexing efficiency by stealing and transmitting network control signals.

[Industrial application field]

The present invention provides a byte-based data transmission system in which one of the envelopes is a frame bit and the other is a status information bit.
This paper relates to improvements in network control signal transmission systems for line connections.

In order to transmit the above-mentioned network control signals, it is particularly desirable to be able to transmit them without providing a dedicated line for the network control signals.

[Conventional technology]

FIG. 3 is a block diagram of a conventional network control signal transmission system, and FIG. 4 is a frame configuration diagram of a byte system including an envelope.

In Figure 3, 1.2 is a data transmitting device, 3 is a multiplexing device, and 4 is a data transmitting device.
5 is a data terminal, 5 is a bit converter at 48 and 64 is a bit converter, 6 is a status signal inserter, 7 is a frame inserter, and 8 is a frame pattern generation circuit.

FIG. 3 shows a frame bit F as an envelope and two status information bits S, which are 1 or O depending on whether or not the data terminal 4 is communicating, for the 6 bits of transmission data D1 to D6 shown in FIG. 4. CCI TT Recommendation
This is an example of a 1-bit frame.

Each data transmitter 1. The 6-bit 48 bits/second transmission data from the data terminal 4 of 2 is 48 bits per second.
64 is converted into a bearer rate of 64 bits/second by the bit converter 5, and the status information bit S is converted by the status signal inserter 6 to 64 bits/second bearer rate.
The status signal data is inserted into the position of frame bit F, and the frame inserter 7 inserts the frame pattern from the frame pattern generation circuit 8 into the position of frame bit F, resulting in the configuration shown in FIG. multiplexed and transmitted.

On the other hand, the network control signal for line connection from the data terminal 4 of each data transmitter 1.2 is transmitted using a common channel signal method using a separate line of the multiplexer 3 exclusively.

[Problem that the invention seeks to solve]

However, the above-mentioned network control signal transmission system has the problem of poor multiplexing efficiency because one channel of the multiplexer is used exclusively for network control signals.

[Means for solving problems]

The above problem is solved by the network control signal transmission method of the present invention, which steals the status information bit when the frame bit is periodic and is at level 1, and transmits the network control signal on top of it. .

[Effect]

The present invention focuses on the fact that a discontinuous 1-bit error in status information bits is not regarded as a malfunction by the protection circuit on the receiving side, and takes measures against consecutive 0s to prevent frame bits from periodically , steal the state information bits at level 1,
Since network control signals are added and transmitted here, there is no need for a line specifically dedicated to network control signals, so multiplexing efficiency is not degraded.

〔Example〕

FIG. 1 is a block diagram of a data transmitting apparatus according to an embodiment of the present invention, and FIG. 2 is a diagram showing an example of a network control signal insertion position.

In FIG. 1, reference numeral 6-1 indicates a status signal inserter, and reference numeral 9 indicates a frame pulse generator, and the same reference numerals indicate the same functions throughout the plan.

The difference in Fig. 1 from Fig. 3 is that in order to avoid consecutive O's, the frame numbers every 5 bits are 3.8, 13, 18, 3, 8 as shown in Fig. 2. An example will be explained in which the state information bits are stolen when the frame bits of ... are at the l level.

The network control signal from the data terminal 4 is sent to the status signal inserter 6-1.
Please input it to .

Further, the frame pulse generator 9 receives the frame number 3. of the frame signal from the frame pattern generation circuit ``8''. 8
．． , 13. When the frame bit of 18... is at the L level, a pulse is generated and sent to the status signal inserter 6-1, and the status signal inserter 6-1 steals the status information bit when this pulse is input and inserts it into the network. A control signal is loaded, a frame signal is inserted by a frame inserter 7, and the frame signal is transmitted.

On the receiving side, the frame numbers are 3.8.13.1B, 3.
When frame bits 8, . . . are at level 1, the status information bits are taken out and used as network control signals.

In this case, the network control signal becomes O or L, resulting in a discontinuous 1-bit error in the status information bit, but such discontinuous 1-bit error cannot be detected by the protection circuit. Since this is not a malfunction, it can be received as a network control signal.

〔Effect of the invention〕

As explained in detail above, according to the present invention, network control signals can be transmitted without providing a dedicated line for network control signals, so there is an effect that multiplexing efficiency is not deteriorated.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a data transmitting device according to an embodiment of the present invention, FIG. 2 is a diagram showing an example of a network control signal insertion position, and FIG. 3 is a block diagram of a conventional network control signal transmission system. FIG. 4 is a frame configuration diagram of the byte method including an envelope. In the figure, 1.2 is a data transmitter, 3 is a multiplexer, 4 is a data terminal, 5 is a bit converter for 48 and 64, 6.6-1 is a status signal inserter, and 7 is a frame inserter. , 8 is a frame pattern generation circuit, and 9 is a frame pulse generator.

Claims (1)

[Claims] In a byte-based data transmission system in which one frame bit in the envelope and the other status information bits are used, the frame bit periodically steals the status information bit when it is at one level, A network control signal transmission method characterized in that a network control signal is transmitted.