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Modulation rate [kbps]**
List box: possible values
Possible values in list box are dependent on the Modulation type setting. The two highest
rates for 25 and 50 kHz channel spacing are available only when the corresponding SW
feature key is active (Either the 166/83 kbps key or the Master key).
Higher Modulation rates provide higher data speeds but they also result in poorer receiver
sensitivity, i.e. reduced coverage range. Reliability of communication over a radio channel
is always higher with lower Modulation rates.
FEC
List box: possible values
Default = Off
FEC (Forward Error Correction) is a very effective method to minimize radio channel
impairments. Basically the sender inserts some redundant data into its messages. This re-
dundancy allows the receiver to detect and correct errors. The improvement comes at the
expense of the user data rate. The lower the FEC ratio, the better the capability of error
correction and the lower the user data rate. The User data rate = Modulation rate x FEC ratio.
ACK
List box: On, Off
Default = On
This setting requires additional bandwidth to repeat corrupted frames.
On
Each frame transmitted on Radio channel from this RipEX has to be acknowledged by
the receiving RipEX, using the very short service packet (ACK), in order to indicate that
it has received the packet successfully. If ACK is not received, RipEX will retransmit the
packet according to its setting of Retries.
NOTE: The acknowledgement/retransmission scheme is an embedded part of the Radio
protocol and works independently of any retries at higher protocol levels (e.g. TCP or
user application protocol)
Off
There is no requirement to receive ACK from the receiving RipEX. i.e. the packet is
transmitted only once and it is not repeated.
Retries [No]
Default = 3 [0=Off, 15=Max]
When an acknowledge from the receiving RipEX is not received, the frame is retransmitted.
The number of possible retries is specified.
Advanced parameters
TX Buffer
The radio protocol transmission buffer handles data waiting to be transmitted. Its size is
defined by both the number of records (Queue length) and total storage space (Queue
size) requirement. Records are held in a queue which is considered full, if either the
Queue length or Queue size is reached. New incoming frames are not accepted when
the queue is full.
Queue length
Default = 5 [1 - 31]
Queue length dictates the maximum number of records held in the queue.
RipEX Radio modem & Router – © RACOM s.r.o.
118
Advanced Configuration
Содержание RipEX
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Страница 42: ... DQ Data Quality Min 180 PER Packet Error Rate Max 5 RipEX Radio modem Router RACOM s r o 42 Network planning ...
Страница 222: ...Fig 10 3 ATEX Certificate RipEX 2 3 RipEX Radio modem Router RACOM s r o 222 Safety environment licensing ...
Страница 223: ...Fig 10 4 ATEX Certificate RipEX 3 3 223 RACOM s r o RipEX Radio modem Router Safety environment licensing ...