XStream™OEMRFModule–ProductManualv5.x00[2006.02.24]
4.3.2. Multi-Streaming Mode
Characteristics: Enables exclusive connections [refer to ‘Operation’ section for definition]
Supports the passing of large data streams (> 256 bytes) from multiple
remote modules to a base module (If a complete data stream from a remote
module is less than 256 bytes, data can be sent from several remotes to a
base location without enabling this mode and latencies will be much less.)
Transmissions never acknowledged (ACK) by receiving module(s)
Required Parameter
Values (TX Module): MD = 1 (Base), MD = 2 (Remote), RN > 0, RR > 0,
MY ≠ 0xFFFF
Recommended Use: Use this mode in point-to-multipoint networks where remote modules
initiate communications and require exclusive (uninterrupted) connections to the base module.
Table4‐05. SampleNetworkProfile
Module Parameter Settings (assume default values for parameters not listed)
Base ATMD 1 [configure module as Multi-Stream Base] *
Remotes ATMD 2 [configure module as Multi-Stream Remote] *
RN,MY,CD,ATandBT.[refertoTable4‐06]
Th
*WhenMulti‐Streamingisenabled,thefollowingparametersareconsequentlymodified(iftheyhavenot
alreadybeenmodifiedfromtheirdefaultstates):RR,
eory of Operation
When in Multi-Streaming Mode, all remote modules can initiate communications with the base
module at the same time, but only one remote is granted an exclusive connection. After an
exclusive connection begins, data is transferred exclusively between two modules withou
interruption from any other modules in the network.
An exclusive conne
t
ction is a bi-directional connection that can only be established when in Multi-
g the
igure4‐07. SampleConnectionSequenceDiagram
In the connection sequence above, an exclusive connection is first granted to “Remote m”. The
CGP (Connection Grant Packet) is broadcast to all remote modules in the network to
communicate the base in engaged in an exclusive connection. Upon receipt of the CGP
notification, remote modules will wait for a DGP (Disconnect Grant Packet) before attempting
again to send data to the base module.
Streaming Mode. An exclusive connection is immune to other remote modules interruptin
connection and interleaving data (The interleaved data potentially renders the base module
unable to discern from which remote module the data was transmitted).
When an exclusive connection is granted to a single remote, the other remotes are notified that
the connection exists. The notification causes the remote modules to postpone transmissions until
the base module sends notification that the exclusive connection has ended.
F
CRP=ConnectionRequestPacket
CGP=ConnectionGrantPacket
DRP=DisconnectRequestPacket(not
shownindiagram–applicablewhen
remoteconnectionisdisconnectedusing
thepinsleepI/Oline.
DGP=DisconnectGrantPacket
ACK=Acknowledgementofreception.
Basemodule=Thecentral
transmitting/receivingmoduleinanetwork
ofmodulesthatmaintainscommunications
withremotemodules.
Remotemodule=Amoduleinanetwork
thatsendsdatatoandreceivesdatafroma
basemodule.
Payload=DatacontainedinsidetheRF
DataoftheRFPacketthatoriginatesfroma
hosttobetransmittedover‐the‐air.
©2006MaxStream,Inc.ConfidentialandProprietary 43
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