User's Manual Part 1

APCD-LM043-8.0 (DRAFT C) 59
4 IP Network Planning
This section is intended to guide you through the process of planning the topology of your
LMS4000 900 MHz network, including IP addressing schemes and the placement and
configuration of routers, Ethernet switches, and network servers. These decisions will be
affected by your subscribers’ requirements, the services you intend to offer, your existing
network environment, level of technical expertise, network size, and future expansion plans.
The CCU provides three protocol modes that determine how it processes network traffic:
• Routed mode
• Switched Ethernet mode
• Through Only mode
4.1 WaveRider Terminology
Ethernet Device—Any device that has an Ethernet MAC address and can communicate over
Ethernet is considered an Ethernet device. Typically, there are two Ethernet Devices per EUM:
the EUM itself and the subscriber’s computer. However, each Ethernet device attached to an
EUM and given air access (see Bridge Table (EUM or CCU in Switched Ethernet or Through
Only Mode) on page 242) should be counted.
Directed Ethernet Packets—Ethernet packets destined for a specific Ethernet device.
Broadcast Ethernet Packets—Ethernet packets with the Ethernet broadcast address as the
destination. All Ethernet devices receive all broadcast packets.
Multicast Ethernet Packets—Ethernet packets with an Ethernet multicast address as the
destination. They are generally destined for one or more Ethernet devices. Multicast Ethernet
packets that make it into the radio network are treated as broadcast packets to all EUMs and
hosts.
Ethernet Segment—All of the Ethernet devices that receive the same directed Ethernet
packets are considered to be on one Ethernet segment. Any device on this segment could put