V.35, Rs-449, And Switched-56 Call Setup With Auto Answering; Dialed Call Setup With Auto Answering; Table 3-3: Timeout Values - PictureTel Concorde 4500 Servicing Manual

NETWORK INTERFACES
V.35, RS-449, and
Switched-56 Call
Setup with Auto
Answering

Dialed Call Setup with Auto Answering

3-12

Table 3-3: Timeout Values

CSU Event
System waits for the Preset Next Digit (PND) signal
to be active after asserting the Call Request (CRQ)
signal.
System waits for the (PND) signal to be inactive
after asserting the Data Port Ready (DPR) signal.
System waits for the PND signal to be active after
deasserting the DPR signal.
System waits for either the Abandon Call and Retry
(ACR) or the Data Set Ready (DSR) signal after the
last digit is sent.
System waits for both the Clear to Send (CTS) and
the Receiver Ready (RR) signals after receiving the
DSR signal from the Channel Service Unit (CSU).
To make a call, the Concorde¥4500 can operate with both dialed and
nondialed networks. Using a dialed network, the videoconferencing
system must dial the connecting number. Using a nondialed network,
the call can be made immediately because the line is always open.
The Request to Send (RTS) and Data Terminal Ready (DTR) signals
are always asserted when the Concorde¥4500 is set for a dialed
network while in Auto Answer mode.
As soon as the network equipment detects the ring signal from the
network, it answers the call and asserts the RR and CTS signals to
the Concorde¥4500. The call is complete when the Concorde¥4500
detects the RR and CTS signals as active and completes any
necessary call setup exchange with the far end.
Timeout
4 seconds
2 seconds
2 seconds
no timeout
30 seconds