3G
3G refers to the third generation of cellular networks. These networks use UMTS to give data transfer speeds of up to 2 Mbps. The Sarian HR4110 and MW4420 routers are 3G capable.

3.5G
3.5G, sometimes referred to as Super 3G, is an enhancement to the third generation of cellular networks. These networks use HSDPA to give data transfer speeds of up to 14.4 Mbps. The Sarian HR4110 router is 3.5G capable.

ADSL – Asymmetric Digital Subscriber Line
The Sarian 4410 & 4420 series of routers have built-in ADSL capability, providing bandwidth for the downstream connection that is significantly larger than for the upstream connection. These routers are well suited for web browsing and client-server applications as well as for some emerging applications such as video on demand.

The data-rate of ADSL strongly depends on the length and quality of the line connecting the end-user to the telephone company. Typically the upstream data flow is between 16 and 640 kilobits per second while the downstream data flow is between 1.5 and 9 megabits per second. ADSL also provides a voice channel.

ADSL shares ordinary telephone lines by using frequencies above the voice band, but the higher frequencies interfere with regular telephone usage. ADSL requires that the user plug DSL low-pass filters into every telephone outlet that serves ordinary telephones, answering machines and faxes.

APN – Access Point Name
The Sarian IR, ER and MR series of routers, and the MW4420 support dual Access Point Names. Each APN identifies an external network that is accessible from the Sarian, and has several attributes associated with it that define how you can access the external network at that point. Thus you can have one APN that can access the Internet, and a second APN that will route traffic to your private network. Your service provider will provide details of how to set up each APN.

Auto MDI / MDX – Medium Dependent Interface / Medium Dependent Interface Crossed
The Auto MDI/MDX is a port on the Sarian used to connect to other hubs or switches, or to end stations. The Auto MDI/MDX port can sense whether the cable plugged in is a straight-through cable (used to connect to other hubs or switches), in which case it automatically switches to MDI mode, or a crossover cable (used to connect the Sarian to an end-station), in which case it automatically switches to MDX mode. All 10/100BaseT ports used on Sarian Routers are Auto MDI/MDX.

Command Line Interface
The Sarian Command Line Interface enables you to enter commands and configuration settings using DOS-like commands directly. This enables you to access and configure the Sarian without having to have access to a Web browser. Instead, you can access the Sarian using Telnet or a direct serial connection.

Dual SIM (Subscriber Identity Module) Port
The Sarian ER, MR and HR series of routers have the capability to accept two Subscriber Identity Modules, that enables you to use one wireless network as the primary network, but in the event that connection to that network is lost, the second network can take over, ensuring no loss of data.

Dynamic DNS – Domain Naming System
Every Sarian router contains a Dynamic DNS client. The client will update the DNS server with the current IP address of interfaces that are mapped to hostnames. For example, if an interface on your Sarian was mapped to www.mycompany.com, every time the IP address for that interface changed, the Sarian would update the DNS server.

EDGE – Enhanced Data rates for GSM Evolution
The Sarian ER and HR series of routers have built in EDGE capability. EDGE is also available as an option on the MW4420. EDGE is an enhancement to GPRS that increases data throughput to 384 Kbps.

Encryption (DES. 3DES. AES. SSL, SSH)
All Sarian routers are capable of using standard encryption algorithms (Data Encryption Standard, Triple Data Encryption Standard, Advanced Encryption Standard, Secure Socket Layer and Secure Shell) to protect the data contained on and transferred through the router.

Ethernet Port
All Sarian routers, with the exception of the TA2020B, have at least one Ethernet port. These ports allow the Sarian to connect to one or more Local Area Networks (LAN), allowing you to manage your traffic effectively.

FTP – File Transfer Protocol
Every Sarian router can receive files using FTP. In addition, the router can act as a relay agent, sending files received on to a specified FTP host, in effect acting as a buffer. This is useful when the router is being used to collect data files from a locally attached device such as a webcam, which must then be relayed to a host system over a slower data connection such as GPRS.

GPRS – General Packet Radio System
The Sarian ER, MR and HR series of routers have built in GPRS capability. GPRS is also available as an option for the MW3520. GPRS is the standard system for transferring data over second generation digital cellular networks. It offers data transfer rates of up to 160 Kbps.

GRE – Generic Routing Encapsulation
All Sarian routers are capable of GRE tunnelling. GRE allows an arbitrary network protocol A to be transmitted over any other arbitrary network protocol B, by encapsulating the packets of A within GRE packets, which in turn are contained within packets of B.

GSM – Global System for Mobile Communications
Sarian MR, ER, HR Series routers (and combination DR6000 Series / MW3520 products) can transmit data over GSM wireless networks. GSM is the second generation of wireless networks introduced to replace the first generation analogue systems. Operating in the 900MHz and 1.8GHz bands in Europe and the 1.9GHz PCS band in the U.S., GSM defines the entire cellular system, and allows up to 8 simultaneous calls on the same frequency.

HSDPA – High Speed Downlink Packet Access
HSDPA is a 3.5G technology that increases the downlink speed by applying different modulation and coding techniques as well as multiple antennas. Sarian HR4110, HR4420 and DR6000 Series routers support HSDPA.

HSUPA – High Speed Uplink Packet Access
HSUPA is a 3G data access protocol for mobile phone networks with extremely high upload speeds up to 5.76 Mbps. Sarian HR4110, HR4420 and DR6000 Series routers support HSUPA.

ISDN – Integrated Services Digital Network
The Sarian TA2020B, IR2110B, DR4410i, ER4420i and MW series of routers can all transmit data over ISDN, an international standard for switched, digital dial-up telephone service for voice and data. Analogue telephones and fax machines are used over ISDN lines, but their signals are converted into digital by the ISDN terminal adapter.

ISDN uses two 64 Kbps "B" (bearer) channels to carry voice and data. A separate "D" (delta) channel is used for control. The D channel signals the carrier's voice switch to make calls, put them on hold and activate features such as conference calling and call forwarding. It also receives caller ID data. Because the D channel connects directly to the telephone system's SS7 signalling network, ISDN calls are dialled much faster than regular telephone calls.

ISDN BRI (Basic Rate Interface) uses one wire pair to carry two 64 Kbps B channels and one 16 Kbps D channel (2B+D). Both B channels are often "bonded" into one, providing a total data rate of 128 Kbps.

LAN Port – Local Area Network
All Sarian routers, with the exception of the TA2020B, have at least one LAN port. These ports allow the router to be connected to one or more Local Area (Ethernet) Networks.

M2M – Machine to Machine
M2M refers to telemetry applications that that allows the remote measurement and reporting of information from one machine to another. The Sarian ER4110 and MR4110 routers can be used for telemetry applications.

Modbus TCP
Modbus TCP is a high-level protocol for industrial networks developed in 1979 by Modicon (now Schneider Automation Inc.). Providing services at layer 7 of the OSI model, it defines a request/response message structure for a client/server environment. Modbus runs over various data links including its own Modbus+ token passing network and serial links such as RS-232 and RS-485.

It is widely used with TCP/IP over Ethernet. Individual device networks connected to Modbus+ or serial links hook into Ethernet via gateways for transport over an IP network or the Internet. Modbus is governed by the Modbus-IDA Organization, a merger of the Modbus Organization and IDA Group in 2003. For more information, visit www.modbus.org.

Sarian Systems have developed a small set of Basic library functions which make it fairly easy to write a simple Modbus/TCP program. This library implements a subset of the Modbus Application protocol and was developed to support the command set on the Telemechanique Advantys OTB Ethernet Remote I/O module. You can get more details about the OTB module (note: 5.4mb PDF download).