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instruction - Answer Incoming Call.
The call is terminated with the DEF instruction - Dis-
connect Call.
Normally, the RPU will be in the receive mode. To initiate the answer-baQ:lcmode, __ a_DEF,
Set Answer Back Mode instruction is executed.
This puts the RPU in the answer-back mode.
There are two answer-back lines that can be set by DEF instructions: Set Answer Back A and
Set Answer Back B.
The DEF instruction Reset Answer Back A and B will remove the answer-
back mode.
The digital subset is returned to the receive mode by the DEF instruction Reset
Answer Back Mode.
--
--
2 tJ14
-..
-..
......
--
---
Transmitting
~
Digital
l
i -
Digital
Receive
Receive
Buffer
Device
Subset
Subset
Control
Lines
Register
Selector
t
a
.......
+
[;]
Control
Lines
Figure 22. Receive Parallel Unit Block Diagram
[ID&IJ&~~[J~ ~@~-----------
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