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LOOSEN
I-
\
LOOSEN'
FIGURE 4-40-DDIU-MA DNA PCB
2) Carefully separate the two halves of the DDIU-
MA to expose the S2 and S3 (DTE/MODEM)
switches (Figure 4-41) in the upper left corner
of the DIUB PCB.
3) If the DDIU-MA is to be connected to a DTE,
both switches must be in the DTE position. If
it will be connected to a DCE, both switches
must be in the MODEM position.
4) Reassemble the DDIU-MA.
5.96 See Operating Procedures or DDIU-MA and
Electronic Telephone User Guides for information
on the DDIU dialpad, LED/button operation and
functions.
INSTALLATION INSTRUCTIONS
SECTlON200-255-204
FEBRUARY1992
s3
--
FIGURE 4-41-DIUB
P[;B
5.97 The DDIU-MA requires three types of con-
nections for proper operation:
l
Power supply (to facility power).
l
25-pin female RS-232C connector (DDIU-MA to
LCEC/NCEC).
l
Single-pair modular connector (DDIU-MA to
LCEWNCEC).
5.98 The power supply (provided) connects the
DDIU-MA to a 117 VAC wail outlet. The 25pin
female RS-232C connector connects to the cus-
tomer-supplied data device and is configured for
either DTE or DCE operation as follows:
4-31
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