Terms and Concepts
Before using the Engage products, you should be familiar with the terms and
concepts that describe TCP/IP. If you are experienced with internet
telephony, these terms may already be familiar to you."

 Glossary of Telephony Terms

General Networking Terms
A network is a collection of computers, server devices, and communication devices connected together and capable of communication with one another through a transmission medium.
An internet is any grouping of two or more networks connected by one or more internet routers.
Network Services
Network services are the capabilities that the network system delivers to users, such as print servers, file servers, and electronic mail.
Transmitting information in a network system is made possible by an addressing scheme that identifies the sender and destination of the transmission, using network and node addresses. Data is transmitted toand from these addresses in the form of packets.
Routing Table
A routing table is maintained in each router. This table lists all networks and routers in the internet and enables routers to determine the most efficient route for each packet. The routing table serves as a logical map of
the internet, specifying the address of the next router in the path to a given destination network and the distance in hops. The router uses the routing table to determine where and whether to forward a packet. Each router periodically broadcasts its routing table to other routers on each of its directly connected networks, enabling them to compare and update their own tables with the most recent record of connected networks and routes. In this way, routing tables are kept current as changes are made on the internet.
A hop is a unit count between networks on the internet. A hop signifies “one router away.”
Device on the network.
TCP/IP Networking Terms
File Transfer Protocol gives users the ability to transfer files between IP hosts. It uses TCP to provide connection initiation and reliable data transfer.
A computer with one or more uses that can act as an endpoint of communication if it has TCP/IP.
Internet Control Message Protocol provides a means for intermediate gateways and hosts to communicate. There are several types of ICMP messages and they are used for several purposes including IP flow control, routing table correction and host availability.
Internet Protocol which routes the data.
IP Datagram
The basic unit of the information passed across and IP Internet. It contains address information and data.
Packet InterNet Groper is a program which uses ICMP echo request message to check if the specific IP address is accessible from the current host.
A Destination point used by transport level protocols to distinguish among multiple destinations within a given host computer.
SubNet Address
An extension of the IP addressing scheme which enables an IP site to use a single IP address for multiple physical networks. Subnetting is applicable when a network grows beyond the number of hosts allowed for the IP address class of the site.
Transmission Control Protocol ensures reliable, sequential, delivery of data. TCP at each end of the connection ensures that the data is delivered to the application accurately, sequential, completely and free of duplicates. The application passes a stream of bytes to TCP which breaks it into pieces, adds a header, forming a segment, and then passes each segment to IP for transmission.
The TCP/IP standard protocol for remote terminal connection service. A user can telnet from the local host to a host at a remote site.
User Datagram Protocol provides simple, efficient protocol which is connectionless and thus unreliable. The IP address contained in the UDP header is used to direct the datagram to a specific destination host.
Well-Known Port
Any set of port numbers reserved for specific uses vy transport level protocols (TCP & UDP). Well-known ports exist for echo servers, time servers, telnet and FTP servers.
Communication Link Definitions
Synchronous Serial Interfaces
A serial interface between two devices which provides for bi-directional data transfer as well as clocking. One device, the DCE, provides the transmit and the receive timing to the second device, the DTE.
Data Communication Equipment (DCE)
This interfaces to the communication service’s transmission/reception medium, and includes T1 Voice/Data Multiplexors, 64/56 Kilobit DSU/ CSUs, and Fiber Optic Modems. The DCE provides the transmit and
receive data pathways, along with their synchronous clocking signals, that are used by the Engage Router’s DTE interface for full duplex communication between the remotely interconnected networks.
Data Terminal Equipment (DTE)
This equipment, such as an Engage Router, attaches to the terminal side of Data Communication Equipment.
Data Carrier Detect (DCD)
A signal that indicates to the DTE that the DCE is receiving a signal from a remote DCE.
Data Terminal Ready (DTR)
Prepares the DCE to be connected to the phone line, then the connection can be established by dialing. Enables the DCE to answer an incoming call on a switched line.
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