Figure 3-2: Rs-366A Call Setup (Part 1) - PictureTel Concorde 4500 Servicing Manual

NETWORK INTERFACES
3-10
Figure 3-2, part 1 and part 2, and illustrate the sequence of events
involved in establishing dialed calls using the RS-366A dialing
protocol.
Note: See Appendix B for the RS-366A pin assignments.
Start
Dialing command received
from the keypad.
Concorde•4500 checks that PWI
is on and that PND, ACR,
DCS, and DLO are off.
Conditions met?
Yes
Concorde•4500 asserts CRQ,
TR, and RS.
DLO active?
Yes
PND active?
Yes
Concorde•4500 places digit (or EON
in case of all phone digits sent) on
NB1, NB2, NB3, NB4. When all digit
signals present, Concorde•4500
asserts DPR.

Figure 3-2: RS-366A Call Setup (Part 1)

Concorde•4500 lowers CRQ,
TR, and RS and sends
"Unable to dial" message
to monitor.
No
PND active?
Concorde•4500 lowers DPR
No*
All digits and
EON sent?
No*
No*
Yes
No*
Yes
1