User's Manual

Datalogic Scanning, Inc
959 Terry Street
Eugene, Oregon 97402
Page 27 10/23/2009
Revision X2
page timeout slots is greater than this value, this value is used a the maximum hold time. A value of zero
indicates that holding around page is disabled.
Key Name Key
Number
Type Default Setting
PSKEY_AFH_ADAPTATION_RESPONSE_TIME 0x00f8 uint16 0x12c0
This sets the interval between successive channel classification updates (and hence channel map
adaptations) for an AFH enabled master. The period is measured in baseband slots (625us), and can be set
between 1 and 30 seonds.
The slave classification intervals sent in the LMP_channel_classfication_req message are derived from this
value:
AFH_max_interval = this_value
AFH_min_interval = this_value / 2
This is not supported on 4Mbit builds. This is not supported on 17.x or earlier builds.
Key Name Key Number Type Default Setting
PSKEY_AFH_OPTIONS 0x00f9 uint16 0x0017
This allows AFH to be configured how the user requires. The bits are designated as below and are not
restricted to classification. bit 0 enable RSSI classification bit 1 enable PLR classification bit 2 enable use
of combo information in classification bit 3 <reserved> bit 4 enable hysterisis of the classifications from
slaves bit 5 disable RSSI classification with low power links bit 6 enable extended RSSI classification with
low power links,
this enables the time period for RSSI classification to be
PSKEY_AFH_RSSI_LP_RUN_PERIOD
.
This is not supported on 4Mbit 18.x builds. This is not supported on 17.x or earlier builds.
RSSI - BlueCore makes signal strength measurements of channels not being used by the Bluetooth link
when the radio would otherwise be idle. This inevitably increases the power consumption. However, it has
the advantage that it makes Bluetooth a good neighbour; it identifies and avoids other users of the ISM
band even if they are not causing problems for Bluetooth operation.
PLR - Dropped packets and bit error rates for FEC encoded headers and payloads are used to estimate the
interference for each of the channels being used. This gives priority to channels that are degrading the
Bluetooth performance. As mentioned above, it will not identify other users of the ISM band unless they
are corrupting Bluetooth packets, and it will not rapidly detect the removal of an interferer on a channel
being avoided.
To use AFH functionality to avoid interference, at least one device in the link must include a classifier.
Key Name Key Number Type Default Setting
PSKEY_AFH_RSSI_RUN_PERIOD 0x00fa uint16 500
This is the period at which point the LC will schedule a RSSI classification, that is, if slots are available the
radio is used as a spectrum analyser to read rssi on all channels or as many as it has time for. These values
are averaged and decay slowly. The value of this key is in unit of ms.
This is not supported on 4Mbit builds. This is not supported on 17.x or earlier builds.