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Connect:Direct is a computer software product to transfer files between mainframe computers, and midrange computers. It was developed for mainframes, with other platforms being added as the product grew. Originally called Network Data Mover (NDM), it was renamed to Connect:Direct in 1993, following the acquisition of Systems Center, Inc. by Sterling Software. In 1996, Sterling Software executed a public spinoff of a new entity called Sterling Commerce, which consisted of the Communications Software Group (the business unit responsible for marketing Connect:Direct product and other file transfer products sourced from the pre-1993 Sterling Software (e.g. Connect:Mailbox)) and the Sterling EDI Network business. In 2000, SBC Communications acquired Sterling Commerce and held it until 2010. In 2010, IBM completed the purchase of Sterling Commerce.[1]


Traditionally, NDM used the IBM Systems Network Architecture (SNA) via dedicated private lines between the parties involved to transfer the data. In the early 1990s TCP/IP support was added. NDM's primary advantage over FTP was that it made file transfers routine and reliable.

NDM is used within the financial services industry, government agencies and other large organizations that have multiple mainframes, Mid-Range, Linux or Windows systems. In terms of speed NDM typically performs slightly faster than FTP, reaching the maximum that the interconnecting link can support. If CPU cycles are available, NDM has several compression modes that can greatly enhance the throughput of the transfer, but care must be exercised in multi-processing environments as NDM can consume large amounts of cycles, impacting other workloads.

NDM itself is not a secure method of transferring data to a mainframe or between mainframes, however Sterling Commerce offers a product that adds this feature: Connect:Direct Secure+. Encryption can be accomplished with Transport Layer Security using SSL, TLS or Station-to-Station protocol (STS).

NDM file transfers can be done in two formats: Binary mode (where no translation occurs) or in a mode where translation is used to convert an ASCII file to EBCDIC as it is moved to a mainframe or vice-versa.

NDM falls under a category of file transfer products called managed file transfer which were used by businesses and government for transfer of critical electronic data.


In the mid-1980s, several employees of UCC left to form "The System Center, Inc." in Dallas, Texas. The new company was going to develop a mainframe systems management tool. While researching the requirements of this new software package, it became clear that a more marketable tool would be a high-speed file transfer product. Thus Network Data Mover was created. Originally developed to support high speed file transfer between mainframes using IBM's OS/MVS operating system, later support was added for IBM's DOS/VSE (mainframe DOS, not PC) and VM/CMS operating systems. Recognizing the need to span the diversity of hardware environments, midrange and finally PC support was added. Currently the product is usable on nearly every operating system in common use.

The System Center company had developed a product that was in high demand, but the company needed additional resources to take advantage of the market climate for NDM. It merged with VM Software of Reston, Virginia to form "Systems Center, Inc.", with the new headquarters in Reston. With the additional funding of the merger, NDM was able to be leveraged into the de facto standard for high speed transfer in the SNA world. The early 1990s were rocky times for the company with wild swings in stock prices, layoffs followed by expansions and hirings just months later. During one of the low times, the company was purchased by Sterling Software of Dallas in 1993. Sterling Software had old ties to Sterling Commerce through Sam Wyly, the founder of UCC. The headquarters then moved back to Dallas. In 1996 the company was split back into two separate divisions, NDM and VM. The two new companies were called Sterling Commerce (the file transfer group) and Sterling Software (all the application software).

Sterling Software had its own file transfer product, Synctrac, which was merged with the NDM division to create a single file transfer centric entity. As the Internet boom occurred, the needs for these file transfer systems grew and the value of the division grew. Eventually in the final days of the boom in early 2001, merely weeks before the crash, Sam Wyly and Sterling Williams sold Sterling Commerce to SBC Communications[2] (now AT&T)[3] for $3.9 billion. Days later the other half of Sterling was sold to Computer Associates for another $4 billion.[4]

IBM announced the closing of its acquisition of Sterling Commerce on August 27, 2010 for approximately $1.4 billion.[1]


  1. ^ a b "IBM Completes Acquisition of". News release (IBM corporation). August 27, 2010. Retrieved September 17, 2011. 
  2. ^ SBC Buys Sterling Commerce
  3. ^ Sterling Commerce - About Us
  4. ^ New Parents for Two Sterlings

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