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DEFINITYEnterpriseCommunicationsServerandSystem75andSystem85
Terminals and Adjuncts Reference
555-015-201
Issue 11
December 1999
Data Modules
21-38The Digital Terminal Data Module (DTDM)
21
Addition of a DTDM allows an in-place 7403D or 7405D voice terminal to be
upgraded for data communications at low cost.
Figure 21-11. A Block Diagram of DTDM Interfaces
Physical Description
The DTDM is contained in a molded plastic housing styled to match the
associated voice terminal. Status lights, switches, and controls are located on the
faceplate and behind a hinged side cover.
Dimensions
NOTE:
The following dimensions are approximate.
Width = 4-3/4 inches
Depth (front to back) = 8-3/4 inches
Thickness = 1-1/2 inches
Data
Terminal
DTDM
Digital Switch
RS-232C
DCE
Digital
Voice
Terminal
DCP
Digital
Line
Port
DTE