User guide

Raven EDGE/GPRS for Cingular - User Guide, version 2.31 28
Data Communication and Host Modes
Note: UDP auto answer may also be set simultaneously with TCP auto answer.
Then, when in the idle state, the modem will accept either a TCP connection
request or UDP incoming packet, and enter a TCP or UDP session as appropriate.
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.
TABLE 1. Hybrid Modes
AT Hybrid (MD5) Hybrid2 (MD6)
MD 3 3
S82 2 2
S0 1 1
*UDPLAST 0 1
Public and Private Mode
By default, the Raven is in Public Mode and will pass the IP address assigned by the Cingular net-
work to the device connected to its port. If you n
eed more control over which gateway address,
device address, and netmask that is given out by the DHCP server, you can use the private host
mode, *HOSTPRIVMODE, and set the internal network IP addresses. The Raven will use NAT
to forward packets to the end device.
Note: When using Public mode, connect the modem directly to the computer or
other end device. Using a hub or switch may prevent the modem from updating
the IP address of the end device when an IP address is received from the Cingular
network.
In Wireless Ace, the Private mode
settings are part of the PPP/Ethernet group.
FIGURE 7. Wireless Ace: Private Host Mode
• *HOSTPRIVMODE - Set to 1 to enable the explicit IP addresses.
255.255.255.0
192.168.0.2
192.168.0.1
1 - Use Private IP