Murata Electronics North America 5811M Manual Do Utilizador
© 2003 Cirronet
Incorporated
12
M-5811-0008 Rev -
115.2Kbaud at the transmitting radio’s host might really be 115,201 and at the receiving
radio’s host it might be 115,199. This is similar to a situation where the transmitting radio is
sent data at a higher baud rate than the baud rate at which data is received by the receiving
host. To compensate for the variations in nominal baud rates, the WIT5811 supports an RF
flow control mode for point-to-point operation. In this mode, when the receive buffer of the
receiving WIT5811 is close to full, the receiving WIT5811 stops acknowledging
transmissions. The transmitting radio is set to infinite retries which invokes the RF flow
control mode (See Set Packet Attempts Limit in Section 5.3). The receiving radio will not
begin acknowledging transmissions from the transmitting radio until more room in the
receive buffer has become available. This will cause data in the transmit buffer of the
transmitting radio to back up. If it backs up to the point where the transmit buffer fills up, the
transmitting radio will de-assert CTS stopping data from the transmitting radio’s host device.
Once room is available in the receiving radio’s buffer, the receiving radio will begin
acknowledging transmissions from the transmitting radio allowing the transmitting radio’s
buffer to begin to empty which will cause the transmitting radio to reassert CTS. Either one
or both of the radios in a point-to-point installation can be configured for the RF flow
control. If this mode is invoked in a point-to-multipoint installation, communications with all
radios will be stopped when any one radio’s receive buffer becomes full.
radio’s host it might be 115,199. This is similar to a situation where the transmitting radio is
sent data at a higher baud rate than the baud rate at which data is received by the receiving
host. To compensate for the variations in nominal baud rates, the WIT5811 supports an RF
flow control mode for point-to-point operation. In this mode, when the receive buffer of the
receiving WIT5811 is close to full, the receiving WIT5811 stops acknowledging
transmissions. The transmitting radio is set to infinite retries which invokes the RF flow
control mode (See Set Packet Attempts Limit in Section 5.3). The receiving radio will not
begin acknowledging transmissions from the transmitting radio until more room in the
receive buffer has become available. This will cause data in the transmit buffer of the
transmitting radio to back up. If it backs up to the point where the transmit buffer fills up, the
transmitting radio will de-assert CTS stopping data from the transmitting radio’s host device.
Once room is available in the receiving radio’s buffer, the receiving radio will begin
acknowledging transmissions from the transmitting radio allowing the transmitting radio’s
buffer to begin to empty which will cause the transmitting radio to reassert CTS. Either one
or both of the radios in a point-to-point installation can be configured for the RF flow
control. If this mode is invoked in a point-to-multipoint installation, communications with all
radios will be stopped when any one radio’s receive buffer becomes full.