Airlink X EV-DO manual Tcp Pad, Hybrid Modes

Data Communication and Host Modes

TCP PAD

When the Raven X is in a TCP session, all characters received on the serial port are assembled into TCP packets and sent to the mode's remote IP address/port, and any packets received from the remote end of the TCP connection are disassembled and dumped onto the serial line.

A TCP connection is established by one of the following methods:

•Using the Dial TCP (DT) AT command (for example, ATDT192.168.3.23/3456)

•TCP auto answer is enabled (S1), a TCP connection request is received, and the modem is not in a data session.

•Data is received on the serial port and

•The Startup Mode Default (MD) is 4 (auto TCP)

•The remote TCP destination, as defined in S53, successfully responds to the TCP connection request.

The value of S7 (TCP Connection Time-out) specifies the number of seconds to wait, after initiat- ing a TCP connection attempt, for a successful connection to be established. If the connection has not been successfully established before the time-out occurs, ERROR/BUSY is returned.

TCP packet assembly is affected by the values of S50 (PAD Forwarding Time-out) and S51 (PAD Forwarding Character). Data received in the serial buffer will be transmitted when the idle inter- character time-out specified in S50 (in tenths of seconds) occurs or when a character is received that matches S51 (if non-zero).

The TCP session will be terminated if no data is transmitted or received for the time interval spec- ified in TCPT and TCPS. TCPT is the number of minutes (TCPS=0) or seconds (TCPS=1) used for this idle time-out.

Hybrid Modes

Some previous hybrid modes (MD=5, 6) are no longer implemented as special, unique modes. Now that UDP auto answer (UDP Half-open, S82=2) can be enabled in conjunction with UDP PAD mode (MD3), effectively this is the same as MD5 and MD6 previously accomplished. Set- ting MD5 and MD6 are still supported, but not recommended.

AT	Hybrid Mode	Hybrid Mode2
Command	(MD5)	(MD6)
MD	3	3
S82	2	2
S0	1	1
*UDPLAST	0	1

Raven X EV-DO for Verizon - User Guide, version 2.34 24