WaveRider LMS4000, Руководство пользователя

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4 IP Network Planning
54 APCD-LM043-4.0
The second concept is the segmentation of the LMS4000 network into distinct subnets, as
illustrated in
Figure 29 .
Figure 29 LMS4000 Subnets
Routers isolate the subnets from each other or from the Internet. The router application
isolates the CCU radio subnets from the CCU Ethernet subnet, and the gateway (NAP) router
isolates the CCU Ethernet subnet from the public Internet.
The number of CAPs that can be supported by one gateway is limited only by the capacity of
the gateway router. If a system has 15 CAPs, each supporting three CCUs, the system
consists of 45 radio subnets.
The radio subnets extend from the CCU radio port through the EUMs to the end-user PC
Ethernet ports. Each radio subnet includes the following elements, all of which, from the
standpoint of the LMS4000 network, require a unique, most likely private, IP address:
• CCU radio port one per radio subnet
• EUM up to 300 per radio subnet
• End-user PC (or LAN router)
• Ethernet port one per EUM (up to 300 per radio subnet)
Based on the above, each radio subnet requires a maximum of 601 IP addresses, which
necessitates a subnet with a 22-bit subnet mask, which provides 2
10
= 1024 addresses.
The CCU Ethernet subnet extends from the CCU Ethernet port through backhaul facilities and
Ethernet switches to the gateway (NAP) router Ethernet port. The CCU Ethernet subnet
includes the following elements, all of which, from the standpoint of the LMS4000 network,
require a unique IP address:
• CCU Ethernet ports
• RFSMs, if provisioned
Gateway (NAP)
Router
Internet
CAPn, CCUm
Router Application
CAP01, CCU01
Router Application
CCU Ethernet
Subnet
CAPn, CCUm
Radio Subnet
CAP01, CCU01
Radio Subnet
End
Users
End
Users
Private Network Public Network
... ... ...
... ... ...
CAP15, CCU03
Router Application
CAP15, CCU03
Radio Subnet
End
Users