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PWI active
CRQ
DLO
PND
DPR
,.
,
,
'
I
'
\
I
I
1:
I
I
NB1
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NB2
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NB4
NBS
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11
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Time is variable from
1.6
µs
to Bit Period of Osc
O
+
0.163
ms.
If Osc
0
freq=
134.49 Hz
max
time would be
7 .6
ms+
.163
ms
or
7.663
ms.
1
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l
'
l
l
..
------~ ~ ~,.~_A_C_U~D-e_pe_n_d_e_n_t~~~~~~~~~
t-J
y
(may stay on)
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(
l
l
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~ l
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( >------------------------------
c
_os~~~~~~~~~
COS is active when connection is established.
A_c_R _ _ _ _ _ _ _ _ _ _ __, L _ _ _ .....
r--~ t-1~---------
r---
_
_ACR is active on time out
(
of ACU with incomplete call.
Figure 12. Automatic Call Operation
Examples of Interface Sequences between the IBM 3704 and 3705 and the Communication Line 41
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