Specifications and Regulatory Information
Modem Reference Information
Reference Guide 133
Register Function (3Com) Range Default
S18 Test timer for AT command &T - when AT&T=0, the timer is disabled
(seconds)
0-255 0
S19 Duration for inactivity timer; S19=0 disables the timer (minutes) 0-255 0
S21 Sets error correction break length (1/100 second) 0-255 1
S22 Designates the ASCII character code for XON 0-127 17
S23 Designates the ASCII character code for XOFF 0-127 19
S25 DTR debounce time indicator (1/100 second) 0-255 0
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
0
S28 V.32 Handshake Time (1/10 second) 0-255 8
S29 V.21 Answer Mode Fallback Timer (1/10 second) 0-255 20
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
2
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
0
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
0
S38 Delay before forced hangup (optional) (seconds) 0-255 0
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