JPH0748752B2 - Method of configuring communication control processor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to a method of configuring an apparatus in a communication control processing apparatus represented by an ISDN user / network interface / D channel signal protocol LAPD.

[Prior art]

Conventionally, this type of communication processing method is the TTC standard "user / network interface, ISDN user / network interface" JT-Q92.
0, JT-Q921 LAPD (Link Access Procedure on the D channe
The data link layer specification typified by l) interfaces with the physical layer (Layer 1) that is the lower layer adjacent to the data link layer, transmits and receives a bit stream from or to the opposite device, detects a flag, detects a frame, and checks a frame (FCS) checking and field decomposition, etc. can be roughly classified into low level processing such as link management, order control, error control, etc., based on the contents of each field.

A communication control processing device that realizes this, as shown in "ISDN subscriber line signal processing device, Japanese Patent Application No. 59-169952", uses the former lower level processing in hardware and the latter higher level processing in firmware. It was realized and the function was shared. FIG. 2 shows a configuration example of a conventional communication control processing device. In the figure, a signal processing unit (SIG) multiplexes and enters m data link channels (hereinafter referred to as D channels) for each subscriber via a multiplexer (MUX) not shown, and these channels Is the logical end of.

In this signaling system LAP.D, the information transmitted on the D channel is sandwiched by two flags indicating the start and end, and is divided into the following four fields.
That is, address fields, control fields,
Information field and frame check sequence (FCS). The address field shows the identification information of the subscriber or the terminal (D-TEL), the control field shows the information showing the format of the frame to be transmitted and received, and the information showing the regularity and order of the frame, The normality of the procedure is confirmed by checking this content. The information field is information transmitted / received to / from the host device, and information is exchanged with the host device by exchanging primitives. Frame check sequence (FCS) is a method to detect bit errors in transmitted / received data. The transmitting side generates a frame check sequence (FCS) pattern by a certain calculation method, and the receiving side uses a frame check sequence (FCS). The normality is confirmed by obtaining a certain residual result by performing the included calculation. Of these processes, the primitive with the higher-level device does not specify the logical interface conditions in detail, and CCITT specifies only that concept.
Detailed interface conditions are defined depending on various systems.

In FIG. 2, a reception arithmetic circuit 2 and a transmission arithmetic circuit 3 are circuits for generating and extracting a flag of information to be transmitted and received, generating and extracting a frame component by detection, and generating and checking a frame check sequence (FCS) pattern. The frame information to be input / output to / from the arithmetic circuit is temporarily stored in the reception buffer 4 and the transmission buffer 5.

The microprocessor 6 provided in the signal processing unit (SIG) 1 analyzes the field in the frame information and confirms the normality of the procedure. And start these processes,
Information is transmitted and received through the interface circuit 7 under the control of the processing unit 8 outside the signal processing unit (SIG) 1.

[Problems to be Solved by the Invention]

However, in the apparatus having the above configuration, the firmware scale is very large, and it is difficult to loosely couple the interface between the two functional blocks, the firmware and the hardware block. According to the requirements of the system, it becomes very difficult to improve the distribution and versatility by using the applicable parts.

It is an object of the present invention to provide a device that enhances the flowability of the layer 2 portion described above and can be easily applied to other systems.

[Means for Solving the Problems]

In the present invention, the function division or function allotment of the layer 2 hardware and firmware is regarded as the function division or function allotment independent of the hardware and firmware configurations,
This is a communication control processing method in which components, components, and macrocells can be formed by loosely coupling them.

[Work]

When the layer 2 (data link layer) receives a processing request from the layer 3, which is a higher-level device, the layer 3 interface unit 12 first receives the request content and determines the content of the request.
A processing unit that takes charge of execution, for example, the processing unit 1 is selected from among n and the processing unit 1 is activated.

The processing units 1 to n are configured to execute contents in units of primitives (information transfer procedure between adjacent layers), and the processing unit 1 executes duties contents by data and control of the common unit. When the execution is completed, the fact is answered to the layer 1 through the layer 1 interface unit.

Embodiments of the present invention will be described in detail below with reference to the drawings.

〔Example〕

FIG. 1 shows an example of processing division of the layer 2 portion. When the processing of layer 2 is divided from the functional aspect, it can be divided into a plurality of functions, a system dependent part which is a unique function part of the system and a recommendation content dependent part which is a CCITT recommendation compliant function as shown in FIG. . Further, the recommendation content dependent part can divide the processing function into primitive units from the common data and the common part having the control function.
If the conventional division of hardware and firmware is considered to be horizontal division, it can be said to be vertical division because this example is division of processing units.

While each divided functional unit has a firmware / hardware interface side at a constant level in the conventional one, this example allows the interface side to be freely set according to the function contents. Therefore, the optimal allocation of firmware and hardware can be determined for each functional unit, and the components can be easily formed. Fig. 1 (b)
FIG. 3 is a block diagram showing functional division of a layer 2 portion. The present embodiment represents the functional blocks of the processing device based on the functional division of FIG. The trigger for starting processing in the layer 2 (data link layer) 10 is either a frame signal from the partner device via the layer 1 interface unit 11 or an upper layer via the layer 3 interface unit 12. This layer 2 (data link layer) 10
The external interface section includes a maintenance test section 13 in addition to the layer 1 interface section 11 and the layer 3 interface section 12, and these three interface sections accept processing request triggers from the outside and what kind of processing is performed. Processing unit 15-which determines whether or not
Start i (1 in). For example, the request is the processing unit 15-
If the content is No. 1, the processing unit 15-1 executes the predetermined business content, and when completed, reports to the respondent via the corresponding interface unit.

The common unit 14 is a set of data and the like commonly used by the processing units 15-1 to 15-n. For example, various status variables such as a transmission status variable V _(S) , a reception status variable V _(R), and a confirmation status variable V _(A) that need to be held for each link, and status numbers.

Next, how to divide the functions of the processing units 15-1 to 15-n will be described. FIG. 3 is a primitive list showing information exchange between adjacent layers. This layer 2 and other layers 2
Communication with each layer adjacent to is logically performed using this primitive. For example, No. 2 in FIG. 3 is a primitive relating to data link setting from layer 3 to layer 2. This primitive is composed of four types of "request", "display", "response", and "confirm".
Here, "request" is for requesting a service (operation) in which the upper layer is in the lower layer, and "display" is for displaying what the lower layer has performed some service (operation). The “response” is for requesting the lower layer to respond to the request from the partner device, and the “confirmation” is for confirming the lower layer to the upper layer as a response to the request.

FIG. 4 is a block diagram showing processing division, and FIG.
Here are two examples. Both are processes relating to multi-frame operation state setting.

First, the process I 20 is a functional block of the process when the multi-frame operation state setting is requested by the primitive “DL-set-request” from the layer 3 (network layer) 21, as shown in FIG. 4 (b). After performing various internal processes such as "clear various internal parameters" and "go to UA reception waiting state", execute SABM command (extended asynchronous balanced mode command) Layer 2 (data link layer) of the opposite device II 17 In order to transmit to 23, the "PH-data request primitive" is transmitted to the layer 1 (physical layer) 18, and the processing is completed. The process II 24 corresponds to the process on the other side of the process I 20, and the process II 24 is started by the “PH-data display primitive”, and after performing internal processes such as clearing various internal parameters, the layer 3 (network layer). ) Go to 25 "DL-Setting-Display Primitive"
And the "PH-data request primitive" to the layer 1 (physical layer) 22 to complete the process.

In this way, one of the processes I to n is assigned to each primitive, and various primitives are executed according to the command content.

〔The invention's effect〕

As described above, since the function division of the layer 2 part is performed by grasping the firmware and hardware as a unit, the division of each division processing device unit, componentization, or macrocell distribution is performed as a component. A method of enhancing the property can be easily introduced. Further, since each functional block of the layer 2 portion can be made into a single function, it is possible to easily design and manufacture a component of an appropriate functional unit.

[Brief description of drawings]

FIG. 1 is a functional division diagram of a layer 2 portion of the present invention, FIG. 2 is a conventional communication control processing device, FIG. 3 is a primitive list,
FIG. 4 is a processing section diagram. 1 ... Signal processing unit, 10, 19, 23 ... Layer 2, 11 ... Layer 1 interface unit, 12 ... Layer 3 interface unit, 13 ... Maintenance test unit, 14 ... Common unit, 15-1 to 15-1 15-n
...... Processing units 1 to n, 16 …… Device I, 17 …… Device II, 18,2
2 ... Layer 1, 20 ... Process I, 21, 25 ... Layer 3, 24
…… Process II, 26 …… Transmission medium.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toshihiko Inagaki 1-7-12 Toranomon, Minato-ku, Tokyo Oki Electric Industry Co., Ltd. (56) References JP-A-62-117050 (JP, A) JP-A-SHO 61-107452 (JP, A) JP-A-59-117357 (JP, A)

Claims (1)

[Claims] 1. A method of configuring a communication control processing device applying a high-level data transmission procedure (HDLC) as a communication means with an opposite device, wherein the function of the communication control processing is divided into primitive units,
A method for configuring a communication control processing device, characterized in that primitive processing units are configured as separate functional blocks.