Transfer concepts

This section describes transfers, and how to create and manage your transfer operations using Transfer CFT.

Transfer CFT can execute both file and message transfers. A transfer consists of a set of processes that result in the exchange of files between computers. In a transfer, one computer is the sender, the other is the receiver. The sender and receiver are linked together by a network. A file transfer may consist of sending a file, group of files, or a message.

Transfer objects

Transfer CFT requires a certain number parameters, such as the protocol, to successfully perform transfers with partners.

Transfer CFT provides a set of objects that allow you to define these transfer related parameters. Prerequisites to make file transfers between two Transfer CFTs include:

  • A common network, such as TCP
  • A common protocol, such as PeSIT ANY
  • A basic partner object on each Transfer CFT (declare each partner)

However, your out-of-the-box Transfer CFT can perform a basic loop transfer without any additional configuration. Additionally, the Transfer CFT installation provides samples that you can use as a templates to get started. For more information on samples and performing a verification transfer, refer to the Post installation section in your OS specific Transfer CFT 3.2.1 Installation Guide.

Transfer types

In Transfer CFT there are 3 types of transfers:

  • Files
  • Replies (acknowledgments)
  • Messages

See also Transfer command basics.

Transfer commands

Transfer CFT uses two commands for transfer requests:

  • SEND: sends a file or message to a partner
  • RECV: requests the reception of files from a partner

Additionally, there are basic transfer control commands that you can use to manage a transfer.

Identifiers

Model files: IDF

Depending on the type of data to be sent, a model file identifier is assigned to each transfer, for example IDF = INVOICES. Processing operations and default values for transfer parameters and data file description parameters can be associated with a model file identifier.

These processing operations and default values are indicated in the CFTSEND and CFTRECV parameter setting commands , for sending and receiving files respectively.

A CFTSEND and a CFTRECV command may correspond to each model file. In the absence of these commands for a given transfer, Transfer CFT uses the default CFTSEND and CFTRECV command parameters, which are valid regardless of the IDF.

The default command is the command whose file identifier corresponds either to the:

  • CFTPART IDF = parameter
  • Or, if the above parameter is not included, to the CFTPARM DEFAULT = parameter

Messages: IDM

A message is a character string specified by a SEND command and sent by the Transfer CFT as a specific transfer. A message transfer does not make reference to a CFTSEND or CFTRECV command.

 

Transfer records

All transfer requests, either SEND or RECV, are recorded and saved in the Transfer CFT catalog file.

A catalog record, known as a catalog entry, includes information such as the:

  • Transfer direction: Send or Receive
  • Type of object transferred: File, Message, or Reply
  • Partner name
  • Transfer identifier
  • Transfer status
  • Troubleshooting diagnostics

For more information, see the list catalog contents topic.

Example command to send a file

In this example the partner is PARIS, and the file to send is called REPORT1.

Transfer identifiers

Transfer CFT enables the transferring sequential files, or files seen as such. These files can be accessed through one of the operating system access methods . See File locations: Model and physical files.

When a transfer occurs, it is labeled with an identifier. There are two additional types of identifiers, besides the IDM and IDF, that can correspond with a transfer:

  • Transfer identifier
  • Catalog identifier

Transfer identifier: IDT

The transfer identifier is a label associated with each transfer, time stamping, for a given partner and transfer direction.

Catalog identifier: IDTU

The catalog identifier, IDTU is a transfer unique local representation. It corresponds to a transfer counter systematically implemented by Transfer CFT.

A transfer can always be uniquely identified locally, regardless of the situation - simultaneous transfers, resumption after incidents, and so on. When there are several Transfer CFTs on the same computer, uniqueness is guaranteed between two Transfer CFTs sharing the same catalog.

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