Glossary

Centrex: A multi-line service offered by operating telcos which provides, from the telco CO, functions and features comparable to those of a PBX for large business users. See also "Private Branch Exchange", "Exchange".

Channel: A data communications path between two computer devices. Can refer to a physical medium (e.g., UTP or coax), or to a specific carrier frequency.

Channel bank: A device that acts as a converter, taking the digital signal from the T1 line into a phone system and converting it to the analog signals used by the phone system. A channel bank acts as a multiplexer, placing many slow-speed voice or data transactions on a single high-speed link.

Circuit-switched Network: A technology used by the PSTN that allocates a pair of conductors for the exclusive use of one communication path. Circuit switching allows multiple conversations on one talk path only if the end-users multiplex the signals prior to transmission.

Circuit switching: The temporary connection of two or more communications channels using a fixed, non-shareable path through the network. Users have full use of the circuit until the connection is terminated.

Clear Channel: A transmission path where the full bandwidth is used (i.e., no bandwidth needed for signaling, carrier framing or control bits). A 64K bps digital circuit usually has 8K bps used for signaling. ISDN has two 64K bps circuits, and a 16K bps packet service of which part is used for signaling on the 64K channels.

Client-Server:In TCP/IP, the model of interaction in distributed data processing in which a program at one site sends a request to a program at another site and awaits a response. The requesting program is called a client; the answering program is called a server.

Cluster Controller: A device that can control the input/output operations of more than one device connected to it. A cluster controller may be controlled by a program stored and executed in the unit, or it may be entirely controlled by hardware.

CODEC (COmpression/DEcompression): The term is used to describe the conversion of voice signals from their analog form to digital signals acceptable to modern digital PBXs and digital transmission systems. It then converts those digital signals back to analog so that you can hear and understand what the other person is saying. In some phone systems, the CODEC is in the PBX and shared by many analog phone extensions. In other phone systems, the CODEC is actually in the phone. Thus the phone itself sends out a digital signal and can, as a result, be more easily designed to accept a digital RS-232-C signal.

Committed Burst Size: The maximum number of bits that the frame relay network agrees to transfer during any measurement interval

Committed Information Rate (CIR): An agreement a customer makes to use a certain minimum data transmission rate (in bps). The CIR is part of the frame relay service monthly billing, along with actual usage, that users pay to their frame relay service provider.

Compression: 1. The process of eliminating gaps, empty fields, redundancies, and unnecessary data to shorten the length of records or blocks. 2. In SNA, the replacement of a string of up to 64-repeated characters by an encoded control byte to reduce the length of the data stream to the LU-LU session partner. The encoded control byte is followed by the character that was repeated (unless that character is the prime compression character). 3. In Data Facility Hierarchical Storage Manager, the process of moving data instead of allocated space during migration and recall in order to release unused space. 4. Contrast with decompression.

COMx Port: A serial communications port on a PC.

Congestion: A network condition where there is too much data traffic. The ITU I.233 standard defines congestion management in terms of speed and burstiness.

Congestion notification: The function in frame relay that ensures that user data transmitted at a rate higher than the CIR are allowed to slow down to the rate of the available network bandwidth.

Consecutive Severely Errored Seconds (CSES): An error condition that occurs when from 3 to 9 SES (Severely Errored Seconds) are logged consecutively.

Customer Premise Equipment (CPE): The generic term for data comm and/or terminal equipment that resides at the user site

and is owned by the user with the following exclusions: Over voltage protection equipment, inside wiring, coin operated or pay telephones, "company-official" equipment, mobile phone equipment, "911" equipment, equipment necessary for the provision of communications for national defense, or multiplexing equipment used to deliver multiple channels to the customer.

D4: the T1 4th generation channel bank.

D4 channelization: Refers to the compliance with AT&T TR 62411 for DS1 frame layout.

D4 framing: The T1 format for framing in AT&T D-Series channel banks, in which there are 12 separate 193-bit frames in a super- frame. A D4 framing bit is used to identify the channel and the signaling frame. Signalling for voice channels is carried in-band for every channel, along with the encoded voice. See "robbed-bit signaling".

Multi-Tech Systems, Inc. MultiVOIP User Guide

MVP120 specifications

Multi-Tech Systems MVP120 is an advanced communication device designed to enhance various applications across industries. It is a part of the Multi-Tech's MVP (MultiVoIP) product line, which is renowned for its versatility and robustness in VoIP (Voice over Internet Protocol) solutions. The MVP120 provides businesses with an efficient way to convert traditional analog voice signals into digital formats suitable for transmission over the Internet or other digital networks.

One of the main features of the MVP120 is its support for up to 12 voice channels. This capability allows multiple calls to be managed simultaneously, making it an ideal choice for businesses with high call volumes. The device offers a seamless integration with existing telephony systems, enabling users to retain their current infrastructure while benefiting from the added advantages of VoIP technology.

The MVP120 utilizes advanced Voice over IP protocols, including SIP (Session Initiation Protocol), which facilitates the establishment, management, and termination of voice sessions over the internet. SIP compatibility enhances interoperability with various service providers and existing communication systems, ensuring a flexible and scalable solution for businesses of all sizes.

Another noteworthy characteristic of the MVP120 is its built-in T.38 fax support. This enables the transmission of fax documents over IP networks, ensuring reliable delivery even in environments where traditional fax machines may experience disruptions. This feature is particularly beneficial for organizations that still rely on fax communication while transitioning to more modern digital systems.

Security is a primary concern in today’s digital environment, and the MVP120 addresses this with comprehensive protocol support, including SRTP (Secure Real-time Transport Protocol) and TLS (Transport Layer Security). These technologies ensure that voice communications remain secure and private, protecting sensitive information from potential threats.

The MVP120 is also designed with user-friendly management and configuration in mind. It features a web-based interface that makes it easy for administrators to set up and manage the device remotely. This simplifies the deployment process and minimizes downtime, allowing businesses to maintain operational continuity.

In essence, the Multi-Tech Systems MVP120 stands out as a powerful tool for businesses seeking to embrace the benefits of VoIP technology while maintaining reliable communication through traditional means. Its combination of voice channels, protocol support, fax capabilities, and security features make it an excellent choice for modern enterprises aiming to enhance their communication systems.