2 two remote locations scenario, Two remote locations scenario -7, Push-to-talk application: scenario 2 -7 – Comtech EF Data SDM-9220 User Manual
Page 135: Figure 9-3, Push-to-talk
Universal E&M/PTT Interface Card
Memotec Inc.
9-7
9.3.2
Two Remote Locations Scenario
In an application involving communications with two remote locations (Scenario 2):
•
The M lead is not permanently connected to Signal Ground at either end of the
connection
•
The E&M connection goes up and stays up once the first M lead transition
occurs, in other words, when the first user at either location presses the talk but-
ton
•
Users at both locations can use their radio as a
PTT CONTROL
device, producing
transitions on the M lead which the NetPerformer detects and regenerates as E
lead transitions at the opposite end of the connection.
Table 9-3: Push-To-Talk Application: Scenario 2