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MR36 User Manual
9 © BWA Technology GmbH
2.9. Description of individual components of MR36
2.9.1. 3G/UMTS module
The Siemens HC15 module is used for HSDPA/UMTS/EDGE/GPRS UMTS network
wireless communication. It is integrated in the printed circuit board. The slide-out SIM card
reader is accessible from the front panel. The FME antenna connector is accessible from the
back panel.
Module HC15
•
communicates in 3G/UMTS band 2100MHz
• CS bitrate – 64/64 kbps
• PS bitrate – 384/384 kbps
• supports W-CDMA FDD (Wideband - Code Division Multiple Access Frequency Division
Duplex) standard
2.9.2. Control microcomputer
The core of the MR36 router is a 32-bit microprocessor Motorola MCF5329 with 16 MB
RAM, 4 MB FLASH EEPROM, serial interface RS-232 and an Ethernet interface 10/100
Mbit/s. The microcomputer is connected to the HC15 OEM module through the USB interface
and controls the communication via HSDPA/UMTS/EDGE/GPRS UMTS. Towards to the user
it is connected on the Ethernet interface.
The software is built on the uClinux operating system.
For the connected devices the modem provides the DHCP service (Dynamic Host
Configuration Protocol) which enables individual clients (computers) to achieve the TCP/IP
configuration when being put into operation. The IP address is set with the assistance of
MR36.
Thanks to the NAT function (Network Address Translation) the modem enables sharing
of the Internet connection by many computers. NAT translates the internal network addresses
and enables each user in the network a transparent access to the external web via a single IP
address. NAT is mechanism which allow reduction of needed quantity unique IP address.
In addition the modem supports the possibility of creation of a GRE tunnel for
connection of two remote LANs to one LAN, which is apparently homogenous. GRE – General
Routing Encapsulation protocol is used without encryption. While using GRE tunnel must exist
on the second side of tunnel equipment buttressing GRE tunnel, for example PC with OS
Linux, CISCO router or MR36.
MR36 dispose function Port Forwarding, it’s improvement of tunnel for forwarding
data’s on port another’s equipment.
Security of data transmission is design by the help of services IPSEC (IP Security).
Service IPSEC provides authenticity check of both knots and security of the encryption carried
data. For protections trustworthiness of data it is using symmetrical encryption.
The modem settings are saved in the FLASH EEPROM memory. All configuring
of the modem can be done through a web interface (HTTP) which is security passwords.