CDMA 3G Router

CDMA 3G Router

The Meizo R63 series industrial 3G CDMA router is used to provide fast and stable internet service in PLCs and other M2M applications. The router CPU is using Broadcom chipset, integrated with industrial grade 3G modem, offering WAN, LAN, SIM, VPN, VRRP, WiFi, and Serial port services, product...

Description

The Meizo R63 series industrial 3G CDMA router is used to provide fast and stable internet service in PLCs and other M2M applications. The router CPU is using Broadcom chipset, integrated with industrial grade 3G modem, offering WAN, LAN, SIM, VPN, VRRP, WiFi, and Serial port services, product line supporting the following radio access technologies: EVDO, CDMA2000 . By owning automatic connection monitoring and heartbeat detection, make sure the router to be always online.


The 3G rugged router is using Industrial Grade equipment design standards, passed CE, FCC and EMC test, stable and reliable. Multiple VPN encryption protocols as L2TP, IPSec, PPTP and GRE are owned, making it ideal solution for applications in which high data bandwidth and strong stability is required.

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Main Features

Hardware Specifications

Software Functions

● Support public and private APN network
● Dedicated hardware and software watchdog are designed to support system running reliable.
● ICMP detection and Heartbeat detection ensure the router to be always on line.
● Reboot the router remotely via SMS.
● Incorporate Virtual Router Redundancy Protocol (VRRP), facilitating 3G WAN backup services to existing fixed line routers, providing both WAN and router redundancy to critical business applications.
● Offers business grade security and advanced routing features IPSec (3Des and AES), L2TP, PPTP, GRE as standard.
● Low-voltage, over current, over voltage, anti-reverse protection
● Wide Power Input DC7-36V
● Standard RS232/485 interface to connect with serial devices.
● Router Factory Default Settings can be configured freely.
● System logs can be viewed from local or remote.
● Support WLAN(300Mbps 802.11b/g/n)
● Support SNMP v1/v2/v3
● LEDS for status monitoring (showing Power, System, Internet, VPN, Signal strength).

CPU
● RAM:512Mbit FLASH:128Mbit
Power
● Input DC 7-36V(Standard DC12V)
Environment
● Storage temperature:-40℃~80℃
● Work temperature:-30℃~70℃
● Humidity:<95%
Dimension
● Unit size L*W*H:150*116.2*23.8mm
● Metal Shell, IP30
● Package weight:830g
Interface
● 1 SIM card slot
● 2 LAN 10/100Mb RJ45 port
● 1 RS232 or RS485 serial port
Antenna(female)
● ANT1 for Cell, ANT2,3 for WiFi
EMC
● Electrostatic discharge immunity:EN6100-4-2, level 2
● RFEMS:EN6100-4-3, level 2
● Surge:EN6100-4-3, level 2
● PFMF:EN6100-4-6, level 2
● Shockwave immunity:EN6100-4-8, Horizontal / vertical direction 400A/m(>level 2)
Physical property
● Shockproof:IEC60068-2-27
● Drop test:IEC60068-2-32
● Vibration test:IEC60068-2-6

VPN
● IPSec client
● PPTP client
● L2TP server and client
● GRE client
WIFI
● Transmitting power: 17dbm
● Distance:Cover a radius of 100 meters in open area test
● Allow 50 users to access in theory
NAT
● Port Mapping
● Port Triggering
● DMZ
Firewall
● IP filtering
● MAC filtering
● URL filtering
QOS
● Manage uplink/downlink bandwidth via port or IP
Management
● Web
● Telnet
● TR-069 platform
Routing
● Static Routing
● Policy-Based Routing.
● Dynamic Routing


Model

Frequency & Band

Bandwidth(UL/DL)

Consumption

WiFi (-W)

Serial(-S)

Power

R63

● CDMA 800/1900MHz

1.8Mbps/3.1Mbps

Work:0.25A@12V DC
Peak:0.32A@12V DC





CDMA Tutorial
Introduction:

This CDMA tutorial describes CDMA basics by explaining PN Sequence codes, Walsh codes,CDMA Physical layer for Base Station and Mobile Subscriber. CDMA is the short form of Code Division Multiple Access. It is the technique by which same frequency and time interval is used by Mobile subscribers/ Base Stations by way of unique digital codes. There are two main types of codes used in CDMA, PN sequence codes and walsh codes.


In CDMA Base Station (BTS) to Mobile Subscriber Stations path is called forward link and Mobile subscriber stations to BTS path is called reverse link.


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PN Sequence codes
PN sequence codes are used in reverse link. These codes differentiates various mobile subscribers at base station as they are unique to all mobile subscribers. There are access and traffic channels used from mobile to Base station in CDMA. PN sequence is a sequence of binary numbers which appears to be random but it is periodic in nature. For example, 3 bit PN sequence is generated with the LFSR(Linear Feedback Shift Register) shown below.

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Say initial output bit pattern is '001' . The same pattern repeats after 2^3-1 or 7 patterns. There are two types of PN sequences used in CDMA, 15 bit pattern and 42 bit pattern.


PN sequence properties: 1. Difference of number of 0's and 1's always be equal to 1 in any PN sequence.
2. Correlation value of any two PN codes is determined by following equation.
(No. of like bits- No. of unlike bits) / (Total no. of bits)
Consider PN sequence of pattern 1110010, If both the patterns are same without any delay then correlation value is 7-0/7, leads to 1 i.e. maximum value.
For a bit change in this PN codes leads to bit pattern equal to 0111001 and it will give correlation value of 3-4/7 i.e. -1/7. Hence it is easy to get back the data of the Mobile/Base station if the PN code is known.
3. For N bit code, there will be N ones or zero runs. 1/2 of run will be of length 1, 1/4 of run will be of length 2, 1/8 of run will be of length 3 and so on.


Walsh codes
Walsh code is called Hadamard Transform. Few of the codes are mentioned below. Walsh codes are orthogonal to each other, Walsh codes differentiates each channel on forward link from Base station to Mobile Subscribers. They are unique for all the channels. There are pilot, sync, paging and traffic channels on this forward link path. W0 is used for pilot channel, W32 is used for sync channel, W1 to W7 are used for paging channel and rest of the 64 Walsh codes are used for traffic channels in IS 95 version of CDMA. There are 256 Walsh codes in CDMA-2000 version. Following figure is of CDMA Physical layer for Mobile Subscriber. Walsh code of length n will have n rows of n x n matrix.
For Example W2= [0 0
0 1]

W4=[0 0 0 0
0 1 0 1
0 0 1 1
0 1 1 0]


Walsh Codes properties 1. Cross correlation between two different Walsh codes is not zero; hence it cannot be used if good synchronization is not available. Instead PN sequence is used.
2. Walsh codes are orthogonal to each other as mentioned above.


CDMA Physical layer for Mobile Subscriber
Figure depicts all the modules used in CDMA Physical layer, as shown green modules are not used in access channel path, while the same are used in traffic channel path.

CDMA Physical layer for Base station
Figure depicts CDMA Physical layer used in CDMA Base station, as shown various channels follow different physical layer architecture.

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