User's Manual

3 Detailed Description
24 APCD-LM043-4.0
Table 5 End-user PC Configuration
3.4.3 LMS4000 Protocol Stacks
The LMS4000 900 MHz Radio Network is an IP (layer 3) network that provides connectivity
from the end-user’s computer to the Internet.
Figure 15 shows the protocol stacks through which an IP packet traverses as it travels
between the end-user’s computer, shown on the left, and the Internet, shown on the right.
Figure 15 LMS4000 Protocol Stacks
3.4.4 Basic Data Transmission
This section describes how an EUM registers, and once it is registered, how data traffic flows
from the Internet to the end-user PC and from the end-user PC to the Internet. The process in
both directions involves CCU and EUM data tables, which are described in more detail in
Appendix E on page 183.
Basic End-user PC Settings Advanced End-user PC Settings
In addition to the above CCU and EUM
settings, the end-user’s PC must be
assigned an IP address and subnet, and a
static gateway address. These IP addresses
can be statically assigned to the PC, as
described in Configuring EUM IP
Parameters on page 99, or dynamically
assigned from a DHCP server by
configuring the CCU for DHCP Relay,
described in DHCP Relay on page 48, and
Configuring DHCP Relay on page 88.
DHCP
10BaseT
Ethernet MAC
IP
TCP/UDP
Applications
(email,
browser, ftp,
telnet, ICQ,
VoIP, ...)
1
2
3
4
5-7
OSI
Layer
End-User's
Computer
10BaseT
Ethernet
MAC
IP Port Filtering
EUM3000
PMAC
DSSS
Radio
10BaseT
Ethernet
MAC
IP Port Filtering
CCU3000
DSSS
Radio
Backhaul
10BaseT
Ethernet
MAC
IP Routing
NAP Router
10BaseT
Ethernet
MAC
Internet
Connection
TCP/UDP
Auth/Reg
PMAC
Auth/Reg
IP Bridging IP Routing
TCP/UDP TCP/UDP
EUM Application CCU Application