IP Telephony Glossary

IP Telephony Glossary - Course Glossary Cisco Networking...

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Course Glossary Cisco Networking Academy Program IP Telephone v1.0 NOTE : The Course Glossary for IP Telephony v1.0 highlights and defines key terms and acronyms used throughout this course. Many of these terms are also described in the Cisco Internetworking Terms and Acronyms resource, available via http://www.cisco.com .
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Acronym or Term Definition 3DES Triple Data Encryption Standard. A stronger form of the Data Encryption Standard (DES), 3DES follows a pattern of encryption/decryption/encryption. 3DES has many different variations. AAL1 ATM adaptation layer 1. One of four AALs recommended by the ITU-T. AAL1 is used for connection-oriented, delay-sensitive services requiring constant bit rates, such as uncompressed video and other isochronous traffic. ABR available bit rate. QoS class defined by the ATM Forum for ATM networks. ABR is used for connections that do not require timing relationships between source and destination. ABR provides no guarantees in terms of cell loss or delay, providing only best-effort service. Traffic sources adjust their transmission rate in response to information they receive describing the status of the network and its capability to successfully deliver data. access rate See AR. adaptive differential pulse code modulation See ADPCM. adaptive predictive coding See APC. Ad-Hoc conference A conference call feature where a conference is started by an initiator and only the initiator of the conference can add people into the conference. admission request See ARQ. ADPCM adaptive differential pulse code modulation. A waveform process by which analog voice samples are encoded into digital signals. advanced integration module See AIM. Advanced Research Projects Agency See ARPA. AF Assured Forwarding. A means of providing different levels of forwarding assurances for IP packets. This method is used by providers who offer differentiated services to their customers. AIM advanced integration module. A module in some Cisco routers that provides enhanced processing capabilities to the routers. alternate mark inversion See AMI. American National Standards Institute See ANSI. AMI alternate mark inversion. Line-code modulation type used on T1 and E1 circuits. In AMI, marks (or ones) cause a pulse in alternating positive and negative directions, while zeros never pulse. Two pulses of the same polarity are not allowed. AMI requires that the sending device maintain ones density. Ones density is not maintained independently of the data stream. Sometimes called binary coded alternate mark inversion . ANI automatic number identification. SS7 feature in which a series of digits, either analog or digital, are included in the call, identifying the telephone number of the calling device. In other words, ANI identifies the number of the calling party. See also CLID. ANSI
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This note was uploaded on 11/10/2009 for the course INT 662 taught by Professor Tholstrup during the Spring '09 term at Fort Hays.

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IP Telephony Glossary - Course Glossary Cisco Networking...

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