User's Manual

Table Of Contents

CATC MERLIN MOBILE 1.00 CHAPTER 5

User’s Manual Recording Bluetooth Traffic

DRAFT

• Single Frequency — Limits Merlin Mobile to the frequency range specified in the DUT

Xmit Freq and DUT Recv Freq boxes. When it is selected, the Sync Method is set to test

mode and cannot be modified by the user.

DUT Xmit Freq: Allows the user to enter the value of the transmit signal (Xmit Freq) for

the Device Under Test (DUT).

DUT Recv Freq: Allows the user to enter the value of the receive signal (Recv Freq) for

the Device Under Test.

Additional Settings

• Correlation Value: This value tells Merlin Mobile how many bits of a packet’s sync

word must be received correctly in order for the packet to be considered valid. For

instance, setting the value to 43 means that at least 43 of the 64 bits available in the sync

word need to be correct to qualify as a valid packet. The value must be an integer

between 33 and 64. The default value is 57 bits.

• Inquiry Timeout: This value specifies how long Merlin Mobile will transmit the inquiry

message to look for Bluetooth devices. The value must be an integer between 0 and 80.

The default value is 20 seconds. An Inquiry Timeout value of zero will cause Merlin

Mobile to perform the inquiry operation continuously, until manually stopped by the

user.

Inquiry Timeout applies only when using the Page Sync & Record method for recording

piconet traffic.

• Loss-of-sync Timeout: This value specifies the how many seconds Merlin Mobile will

wait for piconet traffic before determining that synchronization has been lost. The value

must be an integer between 1 and 16. The default value is 1 second.

• Sync Window: The Sync Window setting controls the amount of time that Merlin

Mobile will wait between receiving an inquiry response and detecting the start of Blue-

tooth traffic between the master and slave devices being tested.

The default setting is “Narrow” and this is suitable for most recordings. However, if

significant drift occurs between Merlin Mobile’s clock and that of the master device,

Merlin Mobile may not be able to synchronize properly. In these cases, the time may be

increased by moving the slider to the right, toward the “Wide” setting. There are five

discrete settings in increasing order from “Narrow” to “Wide”.

After Merlin Mobile is synchronized with the devices, it will remain synchronized with

them as long as there is piconet traffic.

• Initial De-whitening State: This setting controls the initial de-whitening state for syn-

chronization with a piconet.

• De-Whitening On — When De-Whitening On is selected, Merlin Mobile will use

received packets to try to synchronize while performing a de-whitening process that

complies with Bluetooth specifications. This is the default setting.