PRACTICE
553-2201-184
SL-1
Terminal
set
---------------
I SL-1 Line Circuit
II
1
d-ky
Audio
Pair
Hybrid
Transformer
I
I
j,”
Digital-to-
-
Analog Filter
I
-
Codec
[Codec 1
Enable 1
l
L--------------J
Audio--t(=r----SL-,LineCiCcuit,----l
Signaling*
a
-------------
_1
(=I---------
-----
(
1
ll
SL-1
Line Circuit 2
c=r----
---A---
(
--I
1
SL-1 Line Circuit 3
(----
---------
c
+
SL-1 Line Circuit 4
1
(=r-----------l
(1
SL-1 Line Circuit 5,
(=T----
-------~
(1
,
SL-1
LineCircuit
6
CT
------
----_
~
cq
SL-1 Line Circuit 7,
Multiplex
-,
Control
I
r-
_
-,-
Data
/’
out
I
1’
<’
I
’
1
‘\
\
’
‘\-
Card
_I
Enable
+6V
‘E Shelf
3%kplane
to
CE)
--
Fig. 4-l
Simplified Functional Block Diagram of Line Circuit Pack
Page 4-3
-.
:.