DuraMAR 2150 – User’s Manual
Chapter 3 System Operation
This chapter illustrates the operation of the Eurotech Communication Controller (ECC) and its interaction
with the CISCO 3200 ISR. If not otherwise stated, hereafter the word “
system
” will implicitly refer to ECC
subsystem only.
Overview
The ECC is a standard x86-based system running a Linux kernel and a preinstalled application software
(hereafter referred to as
ECC firmware
).
The ECC firmware provides a command line interface by which the user can obtain status information and
perform configuration and maintenance operations. Available status information includes: network interface
status, signal quality, availability of HSDPA service, internal temperatures as well as CPU parameters such
as memory usage and CPU load. Some of this information can be also accessed using SNMP protocol.
The system is equipped with three different network interfaces:
•
one 10/100 Mbps Ethernet interface (
eth0
)
•
one 3G cellular interface (
hsdpa0
) used for providing HSDPA connectivity to the CISCO 3200 ISR
•
one 2G cellular interface (
gprs0
) available as a backup interface for accessing the system in case of
failure on the 3G interface
Operation Mode
The system is capable of operating in two modes:
•
Routing
Mode
•
Bridging
Mode
The mode of operation depends on the configuration of the HSDPA interface (see
further
).
Routing mode
In
Routing mode
the ECC operates as a standard router connected to the CISCO 3200 ISR with an Ethernet
link. In this mode a couple of private IP addresses are used on the link between ECC and the CISCO 3200
ISR with NAT (Network Address Translation) translation enabled on the wireless HSDPA interface.
This mode is suitable when there is no special requirement for the IP address used on the CISCO 3200 ISR
router interface.
Bridging mode
In
Bridging Mode
the ECC will pass the carrier-assigned public IP address back to the CISCO 3200 ISR and
assumes an address in the same subnet for preserving IP connectivity. This public IP address can be
statically assigned to the CISCO 3200 ISR interface or made dynamically available using the DHCP protocol.
This mode is suitable for installations where a single public IP address negotiated on the wireless HSDPA
link must be made available on the CISCO 3200 ISR router interface.
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