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Chapter 5: Reading a Trace
USB Protocol Suite User Manual
118
LeCroy Corporation
5.41 Switch to PTP Sessions
A
session
is a state of persisting communication between a device and a host during
which the connection is continuous and the login and other communication parameters
do not change. A session begins with an
OpenSession
operation, which establishes the
communications connection and parameters, and ends with a
CloseSession
operation.
A session contains all object transfers (and their transactions), plus all transactions that
do not belong to object transfers, between an OpenSession operation and a
CloseSession operation. For PTP, all PTP Object Transfers and all PTP Transactions
that occur from the OpenSession operation to the CloseSession operation is a single
PTP Session
.
The PTP Session trace viewing level is the highest PTP level.
To view PTP sessions, switch to the PTP Session trace viewing level:
•
Click
on the toolbar.
OR
•
Select
View > PTP Session Level
.
OR
•
Select
Setup > Display Options
to display the
Display Options window, check
PTP
Session
, and then click
OK.
5.42 Switch to SCSI Operations
To view SCSI operations, switch to SCSI Operations viewing level:
•
Click
on the toolbar.
OR
•
Select
View > SCSI Operation Level
.
OR
•
Select
Setup > Display Options
to display the
Display Options window, check
SCSI Operation
, and then click
OK.
5.42.1 SCSI Metrics
The SCSI Metrics are:
•
Address
•
Number Of Transfers
: Total number of transfers that compose the SCSI operation
•
Response Time
: Time to transmit on the USB link, from the beginning of the first
transfer in the SCSI operation to the end of the last transfer in the SCSI operation
•
Latency
: Time from the transmission of the SCSI command to the first data trans-
mitted for the SCSI IO operation
•
Data To Status Time
: Time between the end of data transmission for the SCSI
operation and the status transfer
•
Payload
: Number of payload bytes transferred by the SCSI operation
Summary of Contents for USB Protocol Suite Advisor T3
Page 4: ...USB Protocol Suite User Manual LeCroy Corporation ...
Page 168: ...Chapter 7 Display Options USB Protocol Suite User Manual 154 LeCroy Corporation ...
Page 290: ...Chapter 10 Recording Options USB Protocol Suite User Manual 276 LeCroy Corporation ...
Page 372: ...Limited Hardware Warranty USB Protocol Suite User Manual 358 LeCroy Corporation ...
Page 388: ...Index USB Protocol Suite User Manual 374 LeCroy Corporation ...