Tools for Field Testing TTYs with Wireless Telephones – Version 1.2
DSPG Communication, April 5 2001
18
Appendix A
Codebook for Mobile TTY Test Software Log File (in Excel)
Note: The Two-Way Error Scoring software dumps data into an Excel file on the local
computer. Repeated calls are added to that Excel file (unless the filename is changed). The file
contains identifying information about the call conditions, devices, and other information, plus
scores from Lober and Walsh SCORE and the CTM scoring program.
Note that scoring requires that the file output from both sides be present on the same computer,
because the scoring programs compare the characters AS SENT with the characters AS
RECEIVED.
Variables in Excel log file:
Col. Variable
name
Description
A Local
Computer ID
Identifier given by tester for the local computer (on Files screen)
B Remote
Computer ID
Identifier given by tester for the remote computer (on Files screen)
C Start Date Date call began (automatic)
D Start Time Time call began (automatic)
E End Date Date call ended (automatic)
F End Time Time call ended (automatic)
G Seconds Duration of call (automatic)
Scores of data received on local computer per Lober and Walsh Score program and CTM
Scoring Program 3GPP TS 26.231 CTM Minimum Performance Specification. Tester
must run Two-Way Error Scoring program to get these data.
H PCER % Printed character error rate on local side of conversation
I CCER % Consumer character error rate
3
on local side of conversation
J TCER % Total character error rate
4
on local side of conversation
K CTM % CTM error rate on local side of conversation
Breakdown of results:
L PCER total Total printable characters
M PCER correct Number of printable characters correct
N PCER added Number of printable characters added
O PCER missed Number of printable characters missed
P PCER
changed
Number of printable characters changed
Q CCER total Total CCER characters
R CCER correct Number of CCER characters correct
3
CCER generates a fixed penalty for shift-character errors, rather than counting the propagation of all errors that
may result from this single error
4
Includes hidden characters in computation
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