Siretta

linkCONNECT Family: 2G & 3G self managing Modems

Self managing smart modems for 2G or 3G networks with linkCONNECT technology

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Key Features:
  • RS232 to 2G GPRS or RS232 to 3G UMTS
  • Auto detection of networks
  • Agnostic of connected equipment or operating systems
  • Intelligent modem - automatically delivers all data presented to it
  • Adds GSM connectivity to dumb equipment - simply
  • Reliable, automatically connected cellular connection under all network conditions
  • Simple to set up and configure via text commands

 

The linkCONNECT modems are available in GPRS (2G) and UMTS (3G) technologies and work in two modes:

 

Client Mode:

This allows the linkCONNECT modem to send any data that appears on its serial port to a server and receive data from the server. Since the communication is started by the linkCONNECT modem, it will only require the server’s IP address to initiate the communication.

 

Server Mode:

In server mode, the communication is initiated by the server. In this case a Fixed IP SIM is required for the server to be able to connect to the linkCONNECT modem.

In both cases the communication (data transfer) is bi-directional.

 

SirettaPULSE M2M Blog

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Extend your reach with Siretta quality, low-loss RF cables

Acquiring RF signals in poor reception areas (2G/3G/4G), short range wireless communication (line of sight for 433 and 868 MHz) or WifI connection in large buildings will require high gain antennas placed as high as possible to get the best reception. Problem is that the longer the cable length is from the RF equipment to the antenna, the higher the losses and consequently poorer reception. RG174 and RG58 are standard cables that everyone use for RF work, however the losses per metre escalate rapidly the higher the frequency goes. Antennas with cable lengths of 10M, 15M or 20M will suffer considerable loss over the length. It means that a more powerful transmitter and /or a more sensitive receiver is required. This all comes at a price in one way or another. Better to not have the losses there in the first place. Standard RG58 cable has an approximate loss per metre of 1dB at 2.5GHz - Wifi and Euro 4G frequencies. Bear in mind that a loss of 3dB of signal is actually halving the signal strength it is easy to see why systems are not very sensitive if they have long and standard cables to the antenna. Now take the LLC200 low loss RG58 equivalent it has a solid copper core and 2 levels of shielding and special connectors to accommodate the cable. It has a 0.55dB loss per metre at the same 2.5GHz frequency. Bearing in mind the logarithmic nature of measuring in decibels the signal arriving at the end 20M of RG58 cable at 2.5GHz is about 0.07% of what went it to the cable. Alternatively, using the LLC200 cable the signal arriving at the end of the cable is around 12% of what went in. 0.07% versus 12% is a massive difference in signal strength. This is the case for Siretta\'s low loss cable range! Siretta’s low loss extension cables provide the best solution in minimising losses and giving the required RF signal for a successful and continuous wireless connection. Generally speaking low loss cables are not very available as a stock item, however at Siretta we have a complete range of cable lengths and connector styles from stock or very short lead time. Available in cable lengths from 5m to 20m with a vast number of connector combinations, including, SMA, FME, N-Type and TNC etc. Look for the white cable marker telling that it is a Siretta quality cable, its part no. and length.....



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Remote Monitoring using Mobile/GSM Network

Many companies with remote sites and outbuildings require monitoring of their equipment on a regular basis, to ensure that they are in perfect working condition. This monitoring could be in the form of checking temperature, humidity, pressure and other parameters, or could be in the form of smoke detection, gas detection, door open/close etc. Scenarios for Mobile Network only Monitors: 1: Most remote sites do not have a broadband/internet connection or a Local Area Network. This is where remote monitoring equipment using the GSM/mobile network is unbeatable. 2: There are also situations where companies prefer a monitoring solution that is independent of their Local Area Network, to ensure that they will still receive alerts regardless of their server /network condition. Argon 100: Simple, reliable temperature monitor that sends SMS, email and phone call alerts when the temperature goes outside the limits set by the user. Data history can also be sent to the user in spread-sheet format as an email attachment. The Argon 100 be configured using a PC or a mobile phone with text messages. Up to 10 recipients can receive the alerts, ensuring that warnings are not missed. • Works out of the Box (requires SIM) • Temperature monitor with email, SMS and phone call alerts • Configurable with a PC or with Text messaging • Quad Band GSM frequencies - Can be used anywhere in the world • Request current status via SMS • Delivered with all accessories (requires SIM and Sensor)



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5 ways to improve 2G and 3G signal strength for M2M devices

Systems are only as reliable as their weakest link and when it comes to M2M wireless -the weakest link is poor, intermittent signal strength. Low signal levels result in poor system performance, slow response times and reliability issues. For system installers and other M2M vendors, how do you ensure the very best 2G or 3G signal strength?

1. Checking the 2G/3G signal strength
Typically most M2M cellular systems will simply not work, or the performance is substantially degraded by low signal strength. This may result in data not being transmitted, irregular polling success or complete lack of connection. Some wireless devices (routers / modems) have a signal strength indication facility but these only report on the connection available to them.

An independent check of signal strength can be performed using a 2G / 3G signal strength analyser such as the Siretta SNYPER. These testers are hand held, network independent, and analyse the signal strength for all available networks. SNYPER can be connected to the deployed antenna to check the actual signal strength of the installed system.

2. Which network SIM to use?
Depending on location you may find one cellular network has a better signal strength than the other networks. The SNYPER product checks this for you without the need to buy a SIM from each network. Once the network has been decided the next step is to optimise the antenna and RF cables routing back to the M2M device.

3. Re-positioning the antenna
Fitting the antenna in the best possible location has a significant effect on the signal levels received by your M2M equipment. This may mean moving the antenna further away from the M2M device (router, GSM modem) and/or positioning it higher up by mounting to a wall or pole. Directional antennas (e.g. Yagi) can also help improve the signal if you know the direction of the receiving station. For most applications, this information will not be easily available and due to reflections from walls, buildings and other surfaces, more often the signal is not received from the expected direction making omni-directional antennas more appropriate.

4. Go “High-Gain”
Some antennas are far better than others at specific frequencies, ensuring the right antenna is selected for an application is key. Antennas with higher gain will perform far better than low cost alternatives.

5. Reducing signal losses
Running a length of RF cable between antenna and router/GSM modem introduces further degradation of signal strength. Replacing a standard RG58 style RF cable with a low loss equivalent can solve signal strength issues and potentially mean that the antenna does not have to be repositioned. Additionally, low loss cables enable longer RF cable lengths to be used if required.

Summary
Whilst RF signal strength can appear somewhat of a ‘black art’, there exists a number of tried and tested approaches to help improve signal strength for antennas. For most applications, the starting point will be to determine the best cellular network and be able to accurately measure the 2G / 3G signal strength using a signal tester such as the SNYPER 3G.



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