JPH0445627A - Control signal transmission method - Google Patents

Abstract

PURPOSE:To send various control signals in an optional order by setting a kind of a control signal desired to be sent at a sender side to a control signal type identification bit and sending the signal when the control signal is sent through the use of an envelope for the control signal and allowing the receiver side to decode the identification bit in the envelope for the control signal. CONSTITUTION:Two envelopes as a data envelope 1 and a control signal envelope 2 form one unit in a transmission format. The envelope 2 consists of a frame bit F, control signal type identification bits Ci (i=1-4) in 4 bits, a control signal state bit S2 in one bit, a parity bit P in one bit and an envelope state bit V in one bit, in total 8 bits, and the bit Ci is decoded at a receiver side and various control signals are sent in an optional order.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for transmitting control signals of data terminal equipment by a digital multiplexer.

[Conventional technology]

Conventionally, in digital multiplexers, data signals and control signals are transmitted in units of 8-bit envelopes as described in CCITT Recommendation-X, 50 as shown in FIG. 2, F is a frame bit, S is a control signal bit, and D (i=1 to 6) is a data bit.

When multiplexing signals from a terminal device using this envelope, the data signal from the terminal device is multiplexed onto the D bits of the envelope, and one type of control signal is sent to the S bits of the envelope.
Multiplex into bits.

[Problem to be solved by the invention]

Since the conventional control signal transmission method is configured as described above, only one type of control signal can be transmitted from the terminal device. For this reason, for example, data terminal equipment (DTE)
) and the data circuit terminating equipment (DCE).
In order to transmit control signals of V24.10 (1>'J-), the control signals transmitted from DTE to DCE must be
C3, DR transmits control signals from RSDCE to DTE
, CD, CI, and TI, it is necessary to transmit a unidirectional 5-bit control signal, which cannot be handled by conventional methods.

The present invention has been made in view of these points, and its purpose is to be able to transmit control signals of 2 or more bits between the DCE and DTE, and to
The object of the present invention is to obtain a control signal transmission method that is compatible with the envelope format of T-X, 50.

[Means to solve the problem]

To achieve such an object, the present invention provides a method in which, when transmitting control signals, one of the control signals necessary for transmitting and receiving data is transmitted by an envelope of a data channel;
Other various control signals use another channel and consist of a control signal status bit that transmits the status of the control signal and a control signal type identification bit that indicates the type of control signal being transmitted using this control signal status bit. An envelope is created and the control signal type identification bit and control signal status bit within this envelope are used for transmission.

[Effect]

In the control signal transmission method according to the present invention, when transmitting a control signal using a control signal envelope, the transmitting side sets the type of control signal to be transmitted in the control signal type identification bit, and the receiving side Since the control signal is transmitted by decoding the control signal type identification bit in the control signal envelope, it is possible to transmit various control signals in any order.

〔Example〕

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a format diagram showing a transmission format for explaining this embodiment. This transmission format consists of envelope 1 for data and envelope 2 for control signals.
Two envelopes constitute one unit. The data envelope 1 is the same as the envelope described in The control signal status bit S1 consists of a total of 8 bits. The control signal envelope 2 includes a 1-bit frame bit F, 4-bit M control (No. 8 type identification bit C4 (i = 1 to 4), 1-bit control signal status bit S2, 1-bit parity bit P11 bit) It consists of a total of 8 bits including the envelope status bit ■.

For example, when transmitting control signals of the CCTTT-V24,100 series, R3/CD is assigned to control signal status bit S1 of data envelope 1, and other control signals are assigned the control signal type identification shown in the table. Beep) C=
Based on the correspondence between (i=1 to 4) and the type of control signal, the control signal type identification bin)Ci and the control signal status pin)S2 of the control signal envelope 2 are used for transmission. In other words, the type of control signal to be transmitted using the control signal status bit S2 is defined by the control signal type identification bit C1, and the control signal to be placed on the control signal status bit S2 is changed at an arbitrary period. Perform transmission. here,
R3/CD means that the control signal going from DTE to DCE is R3, and the control signal going from DCE to DTE is CD.
. Here, R3/CD is included in the table because R3/CD can be transmitted using the control signal envelope 2.

The table parity bit (P) is a parity bit added to the control signal type identification bin (Ci) in the control signal envelope 2, and the envelope status bit V is used to indicate the significance of the control signal envelope 2 itself. Envelopes 2 for control signals that are used and for which the state of this bit indicates no effect are ignored.

In the above explanation, the parity bit P and envelope status bit ■ have been set, but it is also possible to create a configuration where these are eliminated, or a configuration where the bit configuration of the control signal type identification bit C1 and control signal status bit S2 is other than 4 bits or 1 bit. The control signal envelope 2 can also be used.

〔Effect of the invention〕

As explained above, the present invention provides a control signal envelope in addition to a data envelope, and sets a control signal type identification bit in this control signal envelope, so that many types of control signals can be processed in any order. This has the advantage that the control signal transmission format in the digital multiplexing device can be used in a variety of ways.

[Brief explanation of drawings]

FIG. 1 is a formant diagram of a data envelope and a control signal envelope for explaining an embodiment of the control signal transmission method according to the present invention, and FIG. 2 is a formant diagram of a conventional envelope. Agent Masuo Oiwa

Claims (1)

[Claims] In a digital multiplexing device that performs time-division multiplex transmission of data using an envelope as a unit, when transmitting control signals, one of the control signals necessary for sending and receiving data is transmitted by the envelope of the data channel, and the other is transmitted by the envelope of the data channel. Each type of control signal is sent to an envelope using another channel, consisting of a control signal status bit that transmits the status of the control signal and a control signal type identification bit that indicates the type of control signal being transmitted using this control signal status bit. A control signal transmission method characterized in that the envelope is transmitted using a control signal type identification bit and a control signal status bit in the envelope.