Does XCOM perform any checksum over the data transmitted?

Products

• XCOM Data Transport
• XCOM Data Transport - Windows
• XCOM Data Transport - Linux PC
• XCOM Data Transport - z/OS

Issue/Introduction

Does XCOM calculate a checksum for the data transmitted?

Environment

• XCOM™ Data Transport® for z/OS
• XCOM™ Data Transport® for Windows
• XCOM™ Data Transport® for UNIX/Linux PC

Resolution

XCOM does not perform any checksum calculation over the data being transmitted. That sort of checking is not required at all because it is performed by the underlying communications protocol (TCP/IP) which is responsible to ensure that each packet received is an exact copy of the packet which was sent, as well as to ensure that all packets are delivered and that the target XCOM receives them in the correct sequence.

Whenever TCP/IP detects any error (checksum error or lost packet), the stacks themselves handle packet re-transmission as needed without any intervention by the client application (in this case, XCOM).