ELPRO 805U-E Manual do Utilizador descarregar pdf (Página 33)

Chapter Three Operation

Page 33 © April 2007

Counter module may attempt to increase back to the higher rate after the

specified number of successful transmissions have been made.

Drop Link On Retry

Threshold

When enabled, the module will drop radio link if all retries for

sending a packet fails. When disabled, the module will only drop

link on failure of regular link check transmissions, sent regularly on

inactivity of 6 times the beacon interval. Disabling this item can

improve usability of poor radio paths.

Coexist Mode When enabled, the module will holdoff retries longer to avoid

interfering with module outside radio range. When disabled on an

AP, the AP will shuffle retries with packets destined for other

modules. When disabled on a Client, the module will reduce delay

between retries.

Apply Changes Update settings.

Apply Changes and Save Update settings and save to non-volatile memory.

3.9.1 Duty Cycle Calculations

CE radio regulations limit the transmit duty cycle of the 869.525MHz 500mW channel to

10%. That is, the total transmission time of the radio system should be less than 10% of the

total time.

The Access Point calculates the duty cycle, and provides an internal alarm flag if the

calculated duty cycle exceeds the user-configured setpoint value (default value is 10%). The

alarm flag will reset when the duty cycle drops below a user-configurable “minimum value”

(default 9%). The internal flag can be used to automatically reset the wireless links between

the Access Points and Clients to avoid duty cycle exceeded the configured limit - this

feature needs to be configured by the user; the default setting is “no automatic reset”. The

calculated duty cycle can also be viewed.

The duty cycle is calculated over a duty interval period which is also user-configurable

(default is 60 minutes). The transmission time for each 5 second block is stored. The duty

cycle is calculated every 5 seconds by summing the transmission times over the interval

period and expressing this as a percent of the interval period. For example, if the interval

period is 60 minutes, then the duty cycle is the sum of the transmit times in the most recent

720 x 5-sec blocks, divided by the interval period.

A calculated duty cycle of 10% indicates that the total transmission time has reached 360

seconds in the previous 60 minutes.

3.10 Spanning Tree Algorithm / Redundancy

The “Spanning Tree Algorithm” function was introduced to handle network loops and

provide redundant paths in networks. The Spanning Tree Algorithm can be configured,

however the factory default setting is “disabled”.

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ELPRO 805U-E Manual do Utilizador Página 33