M3SR Series 4100
FastLink Mode (FLM)
5.44
Operating Manual 6175.4760.02 – 01
1
CONNECTED (Tx)
2
Ethernet
3
Application data (e-mail)
4
SECOM-H net
5
Established FLM connection
6
BUSY
7
CONNECTED (RX)
If an application establishes an FLM connection, all other applications are not allowed to es-
tablish an FLM connection themselves, i.e. the FLM state of their gateway radio is "Busy" as
shown in the above picture. After an FLM connection has been established successfully, the
involved applications can exchange data like e-mail. The applications should do this as quick
as possible, since other applications may be waiting for FLM access. The application that ini-
tiated the FLM connection should terminate the connection as soon as the data transfer is
finished.
Data transferred over an FLM connection is mapped by IPoA to a specific service (as done
with any other, non-FLM data). This service must have the FastLink flag configured (see
sect. 5.3 IP over Air (IPoA)).
First, this is required by IPoA (IP over Air) since each service gets a priority assigned in which
data is transmitted, thus also FLM data must be mapped to a specific priority. This allows
IPoA to send non-FLM data in at higher priority (than FLM data) from any station even if an
FLM connection is active.
FLM influences only data mapped to a service with enabled FastLink.
Second, if an FLM connection is active and data is mapped to a service with fastlink on (FLM
assigned data), the data is tagged on the link layer. This allows all other radios in the network
to detect an ongoing FLM data transfer even if the FLM connection establishment was
missed due to a temporary out-of-range situation.
Third, all radios in a network survey an ongoing FLM connection with a timer. As long as FLM
assigned data is transmitted over the radio network, the timer will be reset. If no FLM as-
signed data is seen on the radio network, the timer will elapse and cause the FLM connection
to be terminated automatically (see ”FLM Relative Idle Timeout” on p. 5.49).
FLM does not force the user/an application to establish an FLM connection prior to
transmission of FLM assigned data, i.e. there is no check whether an FLM connection
is active at the time of sending FLM assigned data. It is up to the application to ensure
that an FLM connection was established before sending FLM assigned data. However,
if no FLM connection is active, the FLM controlled data is not tagged (on link layer) as
such and other radios in the network will remain in the IDLE state and will allow other
applications to establish an FLM connection.
Summary of Contents for M3SR 4100 Series
Page 15: ...M3SR Series 4100 Documentation Overview xiv Operating Manual 6175 4760 02 01...
Page 48: ...M3SR Series 4100 Index 34 Operating Manual 6175 4760 02 01 ZF4401 mod 02 2 10...
Page 70: ...M3SR Series 4100 Radio Control 1 22 Operating Manual 6175 4760 02 01...
Page 116: ...M3SR Series 4100 Example Configuration 2 46 Operating Manual 6175 4760 02 01...
Page 336: ...M3SR Series 4100 Priority Channel 3 220 Operating Manual 6175 4760 02 01...
Page 696: ...M3SR Series 4100 Remote Control 8 4 Operating Manual 6175 4760 02 01...
Page 697: ...Operating Manual 6175 4760 02 01 9 1 M3SR Series 4100 Drawings 9 Drawings...
Page 706: ...M3SR Series 4100 Drawings 9 10 Operating Manual 6175 4760 02 01...
