Specifications

Table Of Contents
Data Modules
21-38 Issue 11 December 1999
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
Term inal
DCP
Digital
Line
Port
DTE