58
SATEL OY
// SATELLAR MANUAL // RADIO UNIT // USER GUIDE // V. 1.8
7. Settings
3
Retransmissions
(Packet Mode Radio)
Back off counter
(Packet Mode Radio)
Packet expiration
time (Packet Mode
Radio)
NOTE! Only in QAM
modulation models!
FSK models
- Retransmissions for data and RTS in Point-to-point and
Repeater network topology modes.
- When enabled, RTS message is retransmitted max. 4 times,
data max. 2 times.
- Retransmission process executed after the set max. Back Off
Counter Value.
QAM models
- Retransmissions for data in the radio layer.
- When enabled, radio router executes the retransmissions
according to the adjusted time limit (see Packet expiration
time).
- Retransmissions done after max. packet length if RTS/CTS/
ACK messages are not recognized from the radio network.
- Can be set differently to radio routers in the radio network.
Defines the retransmission time for radio layer handshaking
messages in case the radio channel is occupied.
FSK models
**)
: Shall be set equally to the radio network
devices.
- With Fast Mode –mode selection, raffling done always if back-
off counter greater than 0
0
1.2040
QAM models
- Can be set differently to radio routers in the radio network
- Modem decides when to freeze the BOC value. Priority
(transmission turn) raises higher in every lost transmission
turn (only remaining BOCV are taken into account in the next
raffle time for the same data paket).
0 (ms)*. Recommended to be set to differ from the factory
value, e.g. 1000 (ms)
- Data retransmissions in the radio layer (if enabled) and
transmission request (RTS) max. sending period, if the radio
network is occupied.
- NOTE! The set time value is extended if the retransmitting
radio notices other transmissions in the radio network and is
forced to wait.
0
1.365
0
1.2003
*) Default setting
**) NOTE! The settings must be set equally to all radio modems in the same radio network.
RTS = request to send
CTS = clear to send
ACK = acknowledgement for the data packet
