T600 Tag Tester
DOC#:
UM 360420-835
REVISION F
Page 35 of 55
© Kapsch TrafficCom Canada Inc. 2022
These drawings and specifications contain confidential and proprietary information and are the property of Kapsch TrafficCom Canada Inc. and are issued in strict confidence
and will be kept confidential and used solely for the purpose intended and for no other purpose and shall not be transmitted, reproduced, copied, and/or used as the basis for
manufacture or sale of apparatus unless otherwise agreed to in writing by Kapsch TrafficCom Canada Inc.
FILE: UM 360420-835 REV F, T600 OPERATOR AND MAINTENANCE MANUAL.DOCX 03/28/2022 3:02
Kapsch TrafficCom
4.
T
HEORY OF
O
PERATIONS
This section offers more details on T600 tag testing and calibration than the introductory overview provided in the
Overview on page 15.
Calibration
Calibration can only be performed by Kapsch service personnel. During calibration, a gold standard OBU is used to
determine which margin levels are detected by that particular TTU. These margin levels then become the test criteria
for that OBU type. OBUs fail the margin test if they give margin test results that fall outside the test criteria by +/- 2
dB.
The write tests
Toll collection data and traffic management data is not overwritten during the margin and burst write tests. During a
write test, the same data that was obtained during the read test is written back to the OBU. Additionally, a reserved
memory bit is set to 1 during a write test. Because this bit is set to 0 at the factory, and this bit can only be changed by
the T600, a value of 1 indicates the OBU has been successfully tested by a T600.
The burst tests
The burst tests ensure the OBU can be read and written to consistently. The TTU RF signal attenuation is decreased by
3 db. The TTU then performs 50 reads and 50 writes. To pass the Read burst test, 90% of the 50 reads must be
successful; to pass the Write burst test, 80% of the 50 writes must be successful.
