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The GSMGPRS Modem uses SIM900A based Dualband 9001800MHz GSM GPRS modem. It can be connected to a microcontroller UART using TTL levels. It accepts external voltage 5VDC 2A as input.

SW202 Details Complies with IEEE 802.11n to provide a wireless data rate of up to 300Mbps Provides 1 RJ11 DSL port, 4 RJ45 LAN ports Up to 24Mbps downstream speed DUAL 5 DB ANTENNA Supports Build-in PPPoE DHCP Server/Client, UPnP, DDNS NAT, static routing, and DMZ host QoS prioritization based on IP type of service Easy Setup Assistant provides quick & hassle free installation Provides 64/128-bit WEP encryption security and wireless LAN ACL (Access Control List) Supports web management and firmware upgrade Built-in firewall supporting IP address filtering, MAC address filtering  

SmartM is small and reliable solution for your next IoT project. Keeping the latest trends in mind new data transfer method is introduced. Now instead of sending data to server via traditional methods like TCP/UDP, SmartM can send data directly to your HTTP server or web service and in a very friendly format known as JSON (JavaScript Object Notation). Since JSON is one of the common data exchange method available in all web technologies, so implementing a receiving frontend for SmartM will be much easier than writing a TCP listener. This will also help lower down your web server requirements and hence the overall cost of implementation.  About JSON JSON (JavaScript Object Notation) is a lightweight data-interchange format. It is easy for humans to read and write. It is easy for machines to parse and generate JSON data. JSON is a text format that is completely language independent but uses conventions that are familiar to programmers of the C-family of languages, including C, C++, C#, Java, JavaScript, Perl, Python, and many others. These properties make JSON an ideal data-interchange language. Why JSON? The reason for introducing JSON to SmartM was to ease and expedite front end development for it. Since most of the web developers are very much familiar with formats like JSON and ample amount of support available on web. Moreover, all web development platforms support JSON and its parsing. This is the reason JSON has become common data exchange format between IoT devices and web services.   SmartM can work in two different modes of operation A. RS485 Gateway B. Transparent Device can be configured to work in any mode using “appmode” command. Once configured device must reboot for mode change to take effect. RS485 Gateway Mode: In this mode device collects data periodically from connected slaves based on the register configuration file (reginfo) loaded in the device. Device supports a maximum of 10 slaves for a reliable operation. The transmission rate can be configured for this mode. When connecting different types of slaves, please make sure the MODBUS communication parameters are same for all the devices. E.g. user cannot connect a device that communicates at 9600 baud rate with another device running at 115200. Please refer to section Register Information File section for more information on reginfo file format. Transparent Mode: In this mode of operation, device creates a transparent channel between server and external MODBUS. Anything sent from the server is passed directly without any modification over MODBUS and vice-versa. This mode is mainly useful where user need to take exclusive access of MODBUS or devices on MODBUS. In transparent mode, device makes a TCP socket connection to server and on successful connect device sends its device ID in format “UID=”. After this any data sent to the device will be passed on to MODBUS slave and any data (raw) coming from MODBUS slave will be sent back to server. Feature are listed below : ·              Runtime configurable register set ·              Multi slave support ·              JSON support ·              Secure data transfer via HTTPS ·              Offline data storage in case of server unavailability ·              Bluetooth support for configuration and easy installation ·              Remote configuration via SMS and server ·              OTA Upgrades ·              Expandable using LUA scripting ·              Post data processing using LUA script ·              Switch between gateway and transparent mode any time.   ·              MODBUS protocol selection RTU or ASCII

Telenet’s ISDN Network Termination for basic rate access is the main gate to the world of ISDN. It enables subscribers to use services such as high-speed transmission of data, text and video signals in digital format over an access line in addition to voice transmission. It is a link between the subscriber line (U Interface) and the user Interface to the network (S/T interface). A maximum of 8 terminal units can be connected to the S/T interface. The digital transmission format used offers the subscriber the possibility of access to two independent Basic Channels (B Channels) each with 64 Kbit/s and one 16 Kbit/s Signaling Channel (D), to be transmitted. The terminals connected to S/T for any two ISDN services can use both B channels simultaneously. The associated Signaling information and various service features are transmitted over the D Channel. This result in a Transmission speed of 144 Kbits/s for both transmits and receives direction. The NT1 is installed at the end of the public transmission line coming from the ISDN switch of the local exchange and converts the 2-wire duplex U interface into the 4wire double simplex subscriber S/T interface. Features:   Up to 8 access sockets can be connected to the S/T interface via a 4-wire bus. Two services like telephony and Data transmission can operate simultaneously. Data rate of 144 Kbps is available to the customer at the S/T interface. It has three bus configurations, which have different coverage ranges. Point to Point. Point-to-Multipoint: Short passive bus. Point-to-Multipoint: Extended passive bus. Has four operating modes depending on whether transmission is active or inactive and whether the integrated power supply is working or not Echo cancellation at the U interface ensures that Data Signals are transmitted bidirectionally. The interface modules operate in the automatic mode. The U interface module recovers clock synchronization signal, monitor transmission errors and initiate appropriate actions. In the event of a long-term short circuit, the power supply module is auto switched off and resumes operation automatically with only a delay of few seconds. The design is in compliance with ITU/CCITT/ANSI/ETSI and industry standard 2B1Q line code for the Uinterface. It is easy to install at the user’s premises and can be installed in a wall-mounted cabinet or used as a desktop version. Testing and operation configurations can be adjusted quickly by means of switches and jumpers. The technical data of the NT1 is as under   U-INTERFACE Transmission method 2 Wire full duplex interface using echo cancellation   Allowable attenuation > 42 db at 40 KHz   Line Code 2B1Q   Subscriber Line Connection 8 pin jack (RJ-45)   Voltage at U-Interface 120 V (max)           S/T-INTERFACE Transmission method 4 wire duplex transmission   Range Point to point up to 1000m   Short passive bus   up to 150m up to 8 T E’ S   Extended passive bus   up to 500m up to 4 T E’ S   Interface connector for S/T   RJ-45 x 2 230 V AC   Power Supports Remote powering in absence of local power   Test function Supports loop back commands from the switch