Проверил другой такой же модем ( у меня два т=одинаковых 3СоМа)
результат...

3Com OfficeConnect 56K Business Modem Link Diagnostics...

Chars sent 1719 Chars Received 369
Chars lost 0
Octets sent 1091 Octets Received 370
Blocks sent 68 Blocks Received 12
Blocks resent 0

Retrains Requested 0 Retrains Granted 0
Line Reversals 0 Blers 12
Link Timeouts 0 Link Naks 0

Data Compression V42BIS 2048/32
Equalisation Long
Fallback Enabled
Protocol LAPM SREJ 128/15
Speed 44000/28800
Last Call 00:00:20

Disconnect Reason is DTR dropped
OK

3Com OfficeConnect 56K Business Modem Link Diagnostics...

Modulation V.90/V.34+
Carrier Freq ( Hz ) NONE/1829
Symbol Rate 8000/3200
Trellis Code NONE/16S-4D
Nonlinear Encoding NONE/ON
Precoding NONE/ON
Shaping OFF/ON
Preemphasis Index NONE/14
Recv/Xmit Level (-dBm) 32.0/17.0
SNR ( dB ) 42.6
Near Echo Loss (
Far Echo Loss ( dB )
Roundtrip Delay (msec) 9
Timing Offset ( ppm) -3937
Carrier Offset ( ppm) 45
RX Upshifts 0
RX Downshifts 0
TX Speedshifts 0
V.90 Status AA,5,12N,12.2,0,0N,0,39.9,24.3

OK

Freq Level
150 22
300 21
450 21
600 21
750 21
900 21
1050 21
1200 22
1350 22
1500 22
1650 22
1800 23
1950 23
2100 23
2250 24
2400 24
2550 24
2700 25
2850 25
3000 25
3150 26
3300 26
3450 27
3600 28
3750 31

OK
в строке инициализации ниче не прописывал. Надо че нить прописать?