Dual Screen Android 4G POS Barcode Scanner NFC Reader with SIM Card and WiFi Bluetooth

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The Meizo RD588 series Dual SIM 4G Ethernet wireless router is designed to offer a backup 3G/4G network when the primary network fails. The router is using Broadcom chipset, integrated with WAN, LAN, SIM, VPN, VRRP, WiFi, and Serial port services, product line supporting the following radio access technologies: LTE, HSPA+, HSPA, UMTS, EDGE, CDMA2000, GPRS . By owning automatic connection monitoring and heartbeat detection, make sure the router to be always online.

The router is using Industrial Grade equipment design standards, passed CE and EMC test, stable and reliable. External antenna connectors make it possible to attach desired antennas and to easily find the best signal location. Multiple 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.

Applications

Remote temperature logging

Remote temperature logging solutions are used in end applications to stream live data from remote equipment. This solution is perfect for monitoring real time information in life threatening or dangerous situations where immediate action is required without delay. Loss of connectivity can be tracked and dealt with by using the built in backup CSD (circuit switched dialup) connection to maintain a constant reliable connection. The logging of real time information can be performed in the background and logged results can be reported at a later date to provide an on the spot detailed analysis or daily/weekly/monthly/yearly summary statistics.

The solution enables devices to seamlessly stream information over the network to a central server or headquarters via a robust and reliable connection. Device connectivity enables any connected device to stream its information in real time for live updates and real time monitoring of end equipment.

Common application areas include:

Temperature logging

Temperature / humidity monitoring

Scheduled equipment logging to replace manual processes (clipboard and time stamp)

Real time monitoring of connected devices

Live updates in a central location

Monitoring trigger levels for automatic alarm generation

Resource monitoring

Device statistics

What is“load balancing”

In computing, load balancing improves the distribution of workloads across multiple computing resources, such as computers, a computer cluster, network links, central processing units, or disk drives. Load balancing aims to optimize resource use, maximize throughput, minimize response time, and avoid overload of any single resource. Using multiple components with load balancing instead of a single component may increase reliability and availability through redundancy. Load balancing usually involves dedicated software or hardware, such as a multilayer switch or a Domain Name System server process.

Load balancing differs from channel bonding in that load balancing divides traffic between network interfaces on a network socket (OSI model layer 4) basis, while channel bonding implies a division of traffic between physical interfaces at a lower level, either per packet (OSI modelLayer 3) or on a data link (OSI model Layer 2) basis with a protocol like shortest path bridging.

This way, when a server is down, its DNS will not respond and the web service does not receive any traffic. If the line to one server is congested, the unreliability of DNS ensures less HTTP traffic reaches that server. Furthermore, the quickest DNS response to the resolver is nearly always the one from the network's closest server, ensuring geo-sensitive load-balancing. A short TTL on the A-record helps to ensure traffic is quickly diverted when a server goes down. Consideration must be given the possibility that this technique may cause individual clients to switch between individual servers in mid-session.

Client-side random load balancing

Another approach to load balancing is to deliver a list of server IPs to the client, and then to have client randomly select the IP from the list on each connection.This essentially relies on all clients generating similar loads, and the Law of Large Numbers to achieve a reasonably flat load distribution across servers. It has been claimed that client-side random load balancing tends to provide better load distribution than round-robin DNS; this has been attributed to caching issues with round-robin DNS, that in case of large DNS caching servers, tend to skew the distribution for round-robin DNS, while client-side random selection remains unaffected regardless of DNS caching.

With this approach, the method of delivery of list of IPs to the client can vary, and may be implemented as a DNS list (delivered to all the clients without any round-robin), or via hardcoding it to the list. If a "smart client" is used, detecting that randomly selected server is down and connecting randomly again, it also provides fault tolerance.

Server-side load balancers

For Internet services, a server-side load balancer is usually a software program that is listening on the port where external clients connect to access services. The load balancer forwards requests to one of the "backend" servers, which usually replies to the load balancer. This allows the load balancer to reply to the client without the client ever knowing about the internal separation of functions. It also prevents clients from contacting back-end servers directly, which may have security benefits by hiding the structure of the internal network and preventing attacks on the kernel's network stack or unrelated services running on other ports.

Some load balancers provide a mechanism for doing something special in the event that all backend servers are unavailable. This might include forwarding to a backup load balancer, or displaying a message regarding the outage.

It is also important that the load balancer itself does not become a single point of failure. Usually load balancers are implemented in high-availability pairs which may also replicate session persistence data if required by the specific application

'Honesty as base, Sincere assistance and mutual profit' is our idea, in an effort to create consistently and pursue the excellence for Dual Screen Android 4G POS Barcode Scanner NFC Reader with SIM Card and WiFi Bluetooth. We are aware that the construction of corporate culture is a long-term systematic project, which should be promoted persistently and consistently. Our business philosophy of service-oriented and innovative has always been a strong driving force for our company's rapid development.