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XStream‐PKG‐T™TelephoneRFModem–ProductManualv5.x00[2006.02.24]

4.2. Basic Communications

Basic Communications are accomplished through two sub-types:

• Broadcast - By default, XStream Modems communicate through Broadcast communications

and within a peer-to-peer network topology. When any modem transmits, all other modems

within range will receive the data and pass it directly to their host device.

• Addressed - If addressing parameters match, received RF data is forwarded to the DO (Data

Out) buffer; otherwise, the RF data is discarded.

When using Basic Communications, any functions such as acknowledgements are handled at the

application layer by the OEM/integrator. The Broadcast Modes provide transparent

communications, meaning that the RF link simply replaces a wired link.

4.2.1. Streaming Mode (Default)

Characteristics: Highest data throughput

Lowest latency and jitter

Reduced immunity to interference

Transmissions never acknowledged (ACK) by receiving modem(s)

Required Parameter Values (TX Modem): RR (Retries) = 0

Related Commands: Networking (DT, MK, MY), Serial Interfacing (PK, RB, RO, TT)

Recommended Use: Mode is most appropriate for data systems more sensitive to latency

and/or jitter than to occasional packet loss. For example: streaming audio or video.

Streaming Mode Data Flow

Figure4‐04. StreamingModeStateDiagram(TXModem)

Events and processes in this mode are common to all of the other RF

Communication Modes.

NOTE: When streaming data, RB and RO parameters are only observed on

the first packet.

After transmission begins, the TX event will continue uninterrupted until

the DI buffer is empty or the streaming limit (TT Command) is reached.

As with the first packet, the payload of each subsequent packet includes

up to the maximum packet size (PK Command).

The streaming limit (TT Command) is specified by the transmitting

modem as the maximum number of bytes the transmitting modem can

send in one transmission event. After the TT parameter threshold is

reached, the transmitting modem will force a random delay of 1 to RN

delay slots (exactly 1 delay slot if RN = 0).

Subsequent packets are sent without an RF initializer since receiving

modems stay synchronized with the transmitting modem for the

duration of the transmission event (from preceding packet information).

However, due to interference, some receiving modems may lose data

(and synchronization to the transmitting modem), particularly during

long transmission events.

Once the transmitting modem has sent all pending data or has reached

the TT limit, the transmission event ends. The transmitting modem will

not transmit again for exactly RN delay slots if the local (i.e.

transmitting modem’s) RN parameter is set to a non-zero value. The

receiving modem(s) will not transmit for a random number of delay

slots between 0 and (RN-1) if the local (i.e. receiving modem’s) RN

parameter is set to a non-zero value. These delays are intended to lessen congestion following

long bursts of packets from a single transmitting modem, during which several receiving modems

may have become ready to transmit.

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Sony M - 570V Uživatelský manuál (2 strany)

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