HP Notebook PC Reference Manual page 159

Register Function (3Com/US Robotics)
S27 Bitmapped register.
1=V.21 mode
2=Disable TCM
4=Disable V.32
8=Disable 2100Hz
16=Enable V.23 fallback
32=Disable V.32bis
128=Software compatibility mode
S28 V.32 Handshake Time (1/10 second)
S29 V.21 Answer Mode Fallback Timer (1/10 second)
S32 Connection bitmapped operations.
1=V.8 call indicate enable
2=Enable V.8 mode
8=Disable V.34 modulation
16=Disable V.34+ modulation
32=Disable X2 modulation
64=Disable V.90 modulation
S33 V.34 and V.34+ connection setup bitmapped control flags.
1=Disable 2400 symbol rate
2=Disable 2743 symbol rate
4=Disable 2800 symbol rate
8=Disable 3000 symbol rate
16=Disable 3200 symbol rate
32=Disable 3429 symbol rate
128=Disable shaping
S34 V.34 and V.34+ connection setup bitmapped control flags
16=Disable nonlinear coding
32=Disable transmit level deviation
64=Disable preemphasis
128=Disable precoding
S38 Delay before forced hangup (optional) (seconds)
Selected Result Codes (3Com/US Robotics)
Code Meaning
0 OK
1 CONNECT
2 RING
3 NO CARRIER
4 ERROR
5 CONNECT 1200
6 NO DIAL TONE
7 BUSY
8 NO ANSWER
Reference Information
Modem Reference Information
Range Default
0
0-255 8
0-255 20
2
0
0
0-255 0
Reference Guide 159