Differences between the TDMA System and FDMA System
Only the following functions when sending a Voice Call using a traffic channel in a TDMA system behave differently in a
FDMA system:
0
Voice communication of a Group Call in the Hang Time state
0
Receipt of release notification
Voice communication of a Group Call in the Hang Time state
When the system is in the Hang Time state, regardless of the configuration for
Trunking Type
, how the transceiver starts
transmitting audio signals during a Group Call varies as follows according to the value in the R field of the RFSS status
message (RFSS_STS_BCST) sent from the system. (Refer to
.)
0
If the value of the R field is “%0”, voice transmission is initiated on a traffic channel.
0
If the value of the R field is “%1”, the transceiver migrates to a control channel once and transmits a Group Call request
(GRP_V_REQ). Then, the transceiver waits for a channel assignment message (GRP_V_CH_GRANT) from the
system.
Receipt of a MAC_Release message
If the transceiver receives a MAC_Release message (MAC_REL) from the system during voice transmission, the transceiver
ends voice transmission.
After the transceiver ends voice transmission, the transceiver behaves as follows depending the value in the C/A field of
the MAC_Release message (MAC_REL).
0
If the value in the C/A field is “%0”, the transceiver migrates to a control channel.
0
If the value in the C/A field is “%1”, the transceiver retains the link to a traffic channel.
Trunking Type
Trunking Type
is the function to determine the transmission behavior in a P25 Trunking system.
Table 2-6 Trunking Type
Configuration
Description
Message
When the transceiver migrates from a control channel to a traffic channel, the transceiver occupies
the traffic channel until all communications on the traffic channel end.
Transmit
When communications end after migrating from a control channel to a traffic channel, the
transceiver immediately opens the traffic channel and returns to the control channel.
PTT ID
When the transceiver migrates from a control channel to a traffic channel, the transceiver occupies
the traffic channel until all communications on the traffic channel end. The transceiver always adds
the PTT ID when initiating transmission on a traffic channel.
Configuration using KPG-D1/ D1N
Configuring
Trunking Type
(
Transceiver Settings > Personal > Personality > P25 Trunking)
2 P25 TRUNKING SYSTEM
2.3 About the P25 Standard (Phase 1/ Phase 2)
P25 FUNC (K)/Ver 2.20
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