Meridian America 21, 51, 61, 71 manual l+l

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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