3Com 000839-08 Manual page 158

&A3 Protocol indicators
added
LAPM/MNP/NONE
(error control) and
V42bis/MNP5 (data
compression)
&Bn Manages modem's serial
port rate.
&B0 Variable, follows
connection rate
&B1 Fixed serial port rate
&B2 Fixed in ARQ mode,
variable in non-ARQ
mode
&Cn Controls Carrier Detect
(CD) signal.
&C0 CD override
T Q R
ECHNICAL UICK EFERENCE
&Dn Controls Data Terminal
&C1 Normal CD
operations
Ready (DTR) operations.
&D0 DTR override
&D1 DTR toggle causes
online Command
mode
&D2 Normal DTR
operations
&D3 Resets on receipt of
DTR
153