S e c t i o n 4 - I n s t a l l a t i o n
67
MDF Connection Unit - 212 Wiring
The MDF Connection Unit provides access to the Main Equipment ports via screw-terminals. These
screw terminals have been arranged so as to provide:
Separation between exchange lines and internal equipment.
Access to extension ports.
Access to the Door Phones, Paging port, Alarm Loops and Terminal signalling ports.
Extensions 11, 12, 25, 27 & 14 are suitable for external wiring and is fitted with the required
protection circuitry.
Figure 4-5 MDF connections – 212 system
14
Port 2
Port 1
Security alarm loop 1
Security alarm loop 2
24
23
22
21
18
17
16
15
27 (Expansion slot 2)
25 (Expansion slot 1)
12
11
1
2
3
4
5
6
Au
x1
Au
x2
CO
4
CO
3
-T
x+
-Rx+
CO
2
CO
1
Ex
t11
Ex
t12
Ex
t25
Ex
t27
Ex
t13
Ex
t14
Ex
t15
Ex
t16
Ex
t17 Ex
t18
Ex
t21
Ex
t22
CO
6
CO
5
-T
x+
-Rx+
Al
m
1
Al
m
2
Al
m
R
ly
P
age
Ex
te
ns
io
ns
A
uxilliar
y
Po
rts
Ex
ch
an
ge
L
ine
s
Alar
ms
Power fail extensions
Expansion slot 2 ISDN or PSTN
Expansion slot 1 ISDN or PSTN
Basic system
13
28 (Expansion slot 2)
26 (Expansion slot 1)
Port 4
Port 3
Paging port 4
Alarm/Door latch relay 2
External bell
Door latch relay 1
Ex
t21
E
xt
22
Ex
t21
E
xt
22
Au
x3
A
ux
4
D
oor
Ex
t_
Be
ll
Misc
P
or
ts
