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INSTALLATION INSTRUCTIONS
SECTION 200-255-204
FEBRUARY1992
Digital Data Interface Units. The system must be
told which type of DDIU (-MA or -MAT) is installed
at each location.
1) Remove the electronic telephone base (see
Paragraph 5.12).
5.72 Digital Data Interface Units requireonlysingle-
pair wiring and are connected to the MDF via
standard twisted-pair telephone cables.
NOTE:
2) Replace the telephone base with the DDIU-
MAT.
NOTE:
An electronic telephone with a DDIlJ-MAT
attached cannot be wall-mounted.
The DDIU-MAT requires an additional two-
pair for electronic telephone operation. (For
this reason, three-pair cab/e should be used at
locations where a DDIU-MATmaybe installed.)
5.82 The DDIU-MAT requires four types of con-
nections for proper operation.
l
Power supply (to power outlet).
l
25-pin female RS-232C connector (to data de-
5.73 Digital Data Interface Unit connection details
are shown in Figure 4-37.
vice).
l
2-pair modular line cord (to electronic telephone).
l
3-pair modular connector (to LCECYNCEC).
5.80 DDIU-MAT
5.83 The power supply (provided) connects the
DDIU-MAT to a 117 VAC wall outlet. The 25-pin
5.81 The DDIU-MAT (Figure4-38) mounts directly
female RS-232C connector interfaces with the cus-
on the bottom of an electronic telephone (forming a
tomer-supplied Data Terminal Equipment (DTE)
single unit) as follows:
and uses the following pins:
, NDCU PCB
CROSS-CONNECT BLOCK \.
RJll
T
CKT
TLI
I-' \
26
I
1
RLl
I
'
I
1
PI/-r
TL2
f
!
26
I
1
Ur\l
2
CKT
3
CKT
4
CKT
5
CKT
6
CKT
7
CKT
8
-
(W-BL)
-
(EL-W)
-
(W-G)
-
(G-W)
AL2 i
!
I
r
3
TL3
I
;
I
'
30
-
RL3 1
;
I
5
TL4
'
j
I
32
-
RL4 !
I
7
TL5
!
;
34
I
(R-BR)
:
'
I
'
-
TO
RL5 j
,
9
-
(BR-R)
I
'
DDIU #5
I
TL6
]
,
36
(BK-EL)
' f
TL5 --I
lx5
-
I
RL6II
,,
/
,
TL6 -*
J-0
I
TL7
;
I
36
(BL-BK)
'
;
,qL6 --]
DDlU#6
I
'
-
(BK-G)
;
;
TL7 -*
l-0
TL8
I
I
,3
-
I
'
(G-BK)
/
f
RL7
--]
DDIU #7
RL7 I
'
do
RL6h
,5
(BK-S)
;
]
I
'
(S-BK)
;
:
TO
DDIU #8
L-1
RJ-25
"J" CABLE
' 25-PAIR
CABLE
*CORRECT POLARITY
CONNECTOR PINS
I I
DDIU-MA
DDIU-MAT
FIGURE 4-37-DIGITAL DATA INTERFACE UNIT CONNECTION
(DDIU-MA and DDIU-MAT)
4-28
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