Receiving A Nondialed Call From An X.21 Dce - PictureTel Concorde 4500 Servicing Manual

NETWORK INTERFACES

Receiving a Nondialed Call from an X.21 DCE

3-20
This section describes the sequence of events that occurs when the
Concorde¥4500 automatically answers an incoming nondialed call.
1. When the Concorde•4500 detects incoming data from the far-end, it
answers immediately, asserts the I signal, and places data on the R
signal.
2. The Concorde•4500 responds by transmitting data on the T signal and
asserting the C signal. The connection is complete, and data transfer
continues until the call disconnects.
3. The far end disconnects the call by ending the flow of data. The near-
end CSU responds by placing binary 1 on the R signal and deasserting
the I signal.
4. The Concorde•4500 detects the state of the R and I signals and returns
to the Ready state by placing binary 1 on the T signal and deasserting
the C signal.