PRACTICE 553-2201-183
TO
5001
2500
T-.
set
:
l-4--
Audio and
Signaling
PCWN
Phantomed
Over These
Leads
l+l
_
2-Wire
---*
A’D
Filter
-
TO
LB&
,Kl
4-Wire
c
Conversion
D/A
+
Filler
+
. Superimposed
on
-48
Vdc
from backplane
i
Ring Control
I
r-
-------------------------------
i
c---------------------------------
T-i
500/2500
Line
Circuit 1
I
Fl+
I
I
L----------------------------------:
T
i~---------------------------------l~
500/2500
Line
Clrcult
2
I
4
R~-___---_____-_____________________l
T
i~--------------------------------~
50012500
Line
Circuit
3
I
Fl+
I
I
L-----------_---------------------
r-----------------_---------------
T-i
500/2500
Line
Circuit 4
1
I34
I
!
T
id---------------------------------?
500/2500
Line Circuit 5
I
R-/
1
L___--_-----_--_-------------------
r------------------_--------------
T
i
50012500
Llno
Circuit 6
I
R+
1
I
~---------------------------------,’
r_--------------------------------
”
50012500
Line
Circuit
7
I
R--;
I
1
L-------------------------------~
(111.553-1471)
Note:
QPC532
matches 3 component complex impedance.
Fig. 5-l
+
Block
Diagram of a double density 50012500 Line Pack
Oultiple
-Enat
PE Shelf
Backplane
V’
W
Page 5-8
.:
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