User's Manual

Table Of Contents

CATC MERLIN MOBILE 1.00 CHAPTER 7

User’s Manual Decoding Trace Data

DRAFT

Filtering Hop Frequency Packets

Use the Events tab of the Recording Options dialog to filter hop frequency packets (empty

slots) from a recording. There are two options for doing this:

Filter Empty Slots

If the Filter Empty Slots option is selected, Merlin Mobile will exclude empty time slots

from the recording. This conserves recording memory and eliminates long sequences of hop

frequency packets from the Trace.

Note: Even if ‘Filter Empty Slots’ is checked, some empty time slots will continue to be recorded. Merlin

Mobile will record an empty time-slot before every packet in order to provide the packet with a

timestamp.

Note: Merlin Mobile will record an empty time slot before a packet even if the packet has been filtered from

the Trace. These types of empty time slots can be excluded from the Trace by choosing selecting Filter

Slots on Packet Filter.

Filter Timeslots on Packet Filter

This option prevents Merlin Mobile from recording timeslot packets before packets that are

being filtered out of the Trace.

By default, Merlin Mobile records an empty slot before every packet in order to provide a

timestamp for that packet. Merlin Mobile will record this empty slot even if the packet has

been filtered out of the Trace. This can produce long sequences of empty packets in a Trace,

each marking the location of an excluded packet.

Link Control Packets

•ID

• NULL (0x0)

• POLL (0x1)

• FHS (0x2)

Synchronous Connection-Oriented (SCO) Packets

• HV1 (0x5)

• HV2 (0x6)

• HV3 (0x7)

• DV (0x8)

Asynchronous Connection-Less (ACL) Packets

• DM1 (0x3)

• DH1 (0x4)

• AUX1 (0x9)

• DM3 (0xA)