General DataComm 060A027-001, Installation & Operation Manual

Page: 88 / 138

AT Command Set Operation AT Command Reference Tables
4-8 SpectraComm Dual V.34 Modem 060R122-000
Installation and Operation Issue 15
&H n
Switched network
handshake mode Controls the selection of the switched network hand-shake mode.
When the modem is optioned for an external transmit clock source
&X1
the
modem should be optioned for a fixed hand-shake mode, not an automatic hand-
shake mode (e.g., select V.32 bis only [&H3] instead of V.32 bis automatic [&H2]).
The modem will then handshake only at the speed given to it by the DTE. For 1200
bps V.22 operation, select &H7. &H6 is an auto mode, so setting the DTE to 1200
bps
\T3
will not force the connection to 1200 bps.
&H0 Selects V.34 auto (28.8 - 300)
&H1
selects V.34 only (28.8 - 2400)
&H2
selects V.32 bis automatic (14.4 - 300)
&H3
selects V.32 bis only (14.4 - 4800)
&H4 selects V.32 automatic (9600 - 300)
&H5
selects V.32 only (9600 - 4800)
&H6 selects V.22
bis only (2400 - 1200)
&H7
selects V.22 only (1200)
&H8
selects 212 only (1200)
&H9
selects 103 only (300)
&H10 selects V.21 only (300)
%H n
Private line heartbeat
Sets the value, in half minute intervals, for transmissions of the
H <CR>
heartbeat
on an idle line, where
n
= 0 to 255.
*H n
MNP10 Link Negotiation
Speed Controls the connection speed for link negotiations before up-shift occurs.
*H0
Link negotiations occurs at the highest supported speed.
*H1 Link negotiations occurs at 1200 bps; used primarily for establishing cellular
connections.
*H2
Link negotiations occurs at 4800 bps; used primarily to negotiate an MNP10
connection on less-than average quality telephone lines.