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DEFINITYEnterpriseCommunicationsServerandSystem75andSystem85
Terminals and Adjuncts Reference
555-015-201
Issue 11
December 1999
Data Modules
21-90The 2500-Series DSU
21
The 2500-Series DSU
The 2500-Series DSUs allow the user’s computer or DTE to communicate with
remotely located equipment using Digital Data Service network lines. The DSU
integrates all Channel Service Unit (CSU) and DSU functions into one unit and
connects between the network interface and the user’s DTE.
The DSU can operate as a point-to-point Local Area Data Set (LADS). It is used
when the DCIU and external processor are more than 400 feet apart. Two DSUs
per external processor are required.
Physical Description
The following lists describe the dimensions of the DSUs.
■ Stand-alone Dimensions (approximate)
Width = 5-3/4 inches
Depth (front to back) = 9-5/8 inches
Height = 2 inches
■ Multiple Mounting Dimensions (approximate)
Width = 23 inches
Depth (front to back) = 20 inches
Height = 7 inches
Capabilities
The following are the data capabilities of the DSUs.
■ Full-duplex
■ Synchronous operation
■ Asynchronous operations with certain limitations when used as a LAD
■ Three color test and status LCD panel
■ Multi test functions
■ Two color test and Status/Fault indicator
■ User selectable options
Operating Speeds
The 2556A, 2556B, and 2556C operate at 56 kbps. The 2596A, 2596B, and
2596C have selectable subrates of 2.4, 4.8, or 9.6 kbps. When used as a LAD,
they can also be optioned for 19.2 and 64 kbps operation.