Interpreting Modem Event Logs

Two sample modem event logs produced by LOGWIN.EXE are shown in the following, one for a data modem session and the other for a voice modem session. In order to interpret the event logs, you need to understand the following about how LOGWIN.EXE and Unimodem/V work together to produce the logs.

When Unimodem/V receives a DLE from the modem, the DLE is translated to a standard event. Following is the table that maps the translated value to the event. The modem log displays the actual DLE received and it's translated value.

Translated DLE value Description
0 DTMF 0
1 DTMF 1
2 DTMF 2
3 DTMF 3
4 DTMF 4
5 DTMF 5
6 DTMF 6
7 DTMF 7
8 DTMF 8
9 DTMF 9
10 DTMF A
11 DTMF B
12 DTMF C
13 DTMF D
14 DTMF *
15 DTMF #
16 DTMF Start
17 DTMF End
32 End of Transmit
33 Handset off hook
34 Handset onhook
35 Ring
36 Ringback
37 Answer tone (CCITT - V.25/T.30 2100 Hz)
38 Busy
39 Fax CNG Tone
40 Dialtone
41 Silence
42 Quiet
43 Data calling tone (V.25 1300 Hz tone)
44 Bell answer tone (2225 Hz tone)
255 Don't care - Unimodem ignores DLE