Threshold And Timeout Resend Mechanisms Combined - Basler GIGE VISION ace acA640-100gm/gc Manual

Area scan cameras

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Basler Network Drivers and Parameters

A.3.4 Threshold and Timeout Resend Mechanisms

Figure 68 illustrates the combined action of the threshold and the timeout resend mechanisms

where the following assumptions are made:

All parameters set to default.

The frame includes 3000 packets.

Packet 1002 is missing within the stream of packets and has not been recovered.

Packets 2999 and 3000 are missing at the end of the stream of packets (end of the frame).

The default values for the performance driver parameters will cause the threshold resend

mechanism to become operative before the timeout resend mechanism. This ensures maximum

efficiency and that resend requests will be sent for all missing packets.

With the default parameter values, the resend request threshold is located very close to the front

end of the receive window. Accordingly, there will be only a minimum delay between detecting a

missing packet and sending a resend request for it. In this case, a delay according to the Resend

Timeout parameter will not occur (see Figure 68). In addition, resend request batching will not

occur.

(1)

995

996 997

Fig. 68: Combination of Threshold Resend Mechanism and Timeout Resend Mechanism

(1) Stream of packets, Gray indicates that the status was checked as the packet entered the

receive window. White indicates that the status has not yet been checked.

(2) Receive window of the performance driver.

(3) Threshold for sending resend requests (resend request threshold). The first resend request

for packet 1002 is sent to the camera. The camera does not respond with a resend.

(4) Interval defined by the Resend Response Timeout parameter.

(5) The Resend Timeout interval expires and the second resend request for packet 1002 is sent

to the camera. The camera does not respond with a resend.

(6) Interval defined by the Resend Response Timeout parameter

(7) The Resend Timeout interval expires and the third resend request for packet 1002 is sent to

the camera. The camera does not respond with a resend.

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Combined

(2)

(3)

998

999 1000 1001 1003

1004

(4)

(5)

(7)

(9)

1005

1006

1007

1008

1009

1010

1011

(6)

(8)

DIAGRAM IS NOT DRAWN TO SCALE

(10)

(11)

1012 1013

1014 1015 2996 2997 2998

(12)

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Threshold And Timeout Resend Mechanisms Combined - Basler GIGE VISION ace acA640-100gm/gc Manual

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