Abstract: Disclosed in a facsimile apparatus which performs communication using the user-to-user of an ISDN. User-to-user information inputted from a control panel and used when an outgoing call is made is capable of being registered in a buffer memory as one-touch dialing data or abbreviated dialing data, or user-to-user information employed in communication is capable of being registered in the buffer memory as redialing data when communication ends. The user-to-user information is registered as data only with regard to one-touch dialing or abbreviated dialing limited in advance.

Abstract: When a no-communication state is detected for a predetermined time of time during communication in response to an interrupt designation to or from an apparatus on the other end of the line, an operation of a time monitoring timer for terminating the communication is interrupted. The time monitoring timer is restarted in response to a restart designation. Therefore, communication can be continued without interrupting an interrupt/restart service provided by, e.g., an ISDN due to a time-out error. When a trouble which disables communication occurs during communication, an interrupt service is requested to a network. When the trouble which disables communication is recovered, a restart service can be requested to the network. In this case, communication can be normally restarted without being accidentally terminated intermediately.

Abstract: A mixed data processing apparatus having a memory for storing mixed data of character blocks and image blocks and a discriminator of discriminating whether or not the number of blocks stored in the memory exceed a predetermined number. A synthesizer synthesizes the blocks when the number of blocks in memory exceeds the predetermined number of blocks. During synthesizing, character blocks are converted into image blocks. After synthesizing, the mixed data is transmitted by a transmitter to a party being transmitted to.

Abstract: A communication system for communicating a document comprising image data, character code data, and the like has: a receiver to receive the document data; a memory to store the received document data; a designating unit designate the data in the memory; an instructing unit to command the printing of the designated data; a printer to print the designated data on the basis of the instruction by the instructing unit; and a controller for allowing the received document data to be printed by the printer when a failure of the memory is detected even if printing is not commanded by the instructing unit. The failure of the memory may be a lack of memory capacity. The received document data may be output to either the memory or the printer in accordance with signals from the transmission side. This system includes another instructing unit to command the deletion of the designated document data from the memory.

Abstract: A data communication apparatus transmits data in divided blocks, and attaches a particular code to an overlapping data block, thereby reducing the time required for transmission.