SDM-9220/9230 Hardware Installation Guide
9-6
Memotec Inc.
9.3 About Push To Talk (PTT)
PTT is a permanent point-to-point connection that is used to key a radio in two different
scenarios:
•
Scenario 1:
From a remote mobile location to a control station, such as an air
traffic control application. See
“Push-To-Talk Application: Sce-
•
Scenario 2:
Between two remote locations. See
on
Application: Scenario 2” on page 9-8
.
In both of these scenarios:
• The audio path is
always
up
• The
PTT CONTROL
device produces M lead transitions on the E&M connection
• The NetPerformer detects these M lead transitions, and regenerates them as E
lead transitions
• The E lead transitions are transmitted and replayed at the other end of the connec-
tion
without clearing the audio path
• As a result, more rapid communications can take place between the two loca-
tions.
9.3.1
Fixed Control Station Scenario
In an application involving communications with a
fixed control station (Scenario 1)
:
• The M lead is permanently connected to Signal Ground at the
PTT ANSWER
side, so that the E&M channel is up at all times
• Only the control station operates as a
PTT CONTROL
device.
Summary of Contents for NetPerformer SDM-9220 Series
Page 1: ...NetPerformer SDM 9220 SDM 9230 Hardware Installation Guide ...
Page 8: ...Memotec Inc ...
Page 12: ...Memotec Inc ...
Page 13: ...1 Memotec Inc 1 1 Preface ...
Page 24: ...SDM 9220 9230 Hardware Installation Guide 1 12 Memotec Inc ...
Page 25: ...2 Memotec Inc 2 1 Compliance Information ...
Page 39: ...Compliance Information Memotec Inc 2 15 2 3 3 Compliance to China RoHS ...
Page 41: ...3 Memotec Inc 3 1 Unpacking ...
Page 47: ...4 Memotec Inc 4 1 Hardware Installation ...
Page 80: ...SDM 9220 9230 Hardware Installation Guide 4 34 Memotec Inc ...
Page 81: ...5 Memotec Inc 5 1 Product Description ...
Page 113: ...6 Memotec Inc 6 1 Serial Port and User Equipment Connections ...
Page 122: ...SDM 9220 9230 Hardware Installation Guide 6 10 Memotec Inc ...
Page 123: ...7 Memotec Inc 7 1 Networking Features ...
Page 127: ...8 Memotec Inc 8 1 Troubleshooting Tips ...