Maxon Electronics Australia Pty. Ltd. MM-5500PRO Manuale Utente

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2. Operation Process 
There are two-way of MM-5500PRO operation. One is PPP (Point to Point Protocol) mode 
and the other one is PPPoE(PPP over Ethernet) mode.   
 
2.1 PPP mode 
On PPP mode MM-5500PRO has the IP from ISP (Internet Service Provider) itself, so MM-
5500PRO can share the IP with many Host PCs. Below figure 3 shows PPP mode operation. 
 
    [Figure 3. PPP mode operation]   
 
First, Host PCs get each private IP(hereby IP-1) from MM-5500PRO via DHCP server. 
Second MM-5500PRO gets public/Private IP(hereby IP-2) from ISP via CDMA 1x EVDO 
modem. Now MM-5500PRO has two kinds of IP, one is from ISP and the other ones are to 
Host PCs. Third, MM-5500PRO convert network data between IP-1 and IP-2 via NAT. 
 
2.2 PPPoE mode 
On PPPoE mode MM-5500PRO has no IP, just the Host PC gets IP from ISP. 
 
    [Figure 4. PPPoE mode operation]   
 
Different on PPP mode, the IP from ISP goes to Host PC directly. MM-5500PRO   
 
converts protocol from PPP to PPPoE or on reverse direction, the Host PC processes all 
network protocols.