Appendix
Abbreviation/ | Explanation | |
Term | ||
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| |
QCIF | Quarter CIF. A video format with image size of 176x144 | |
| pixels that transmits 9.115 Mbps at 30 frames per second | |
| (a quarter of the capacity of CIF). For more information, | |
| see CIF. | |
|
| |
QoS | Quality of Service. QoS defines the performance of a | |
| network service, such as the average delay between | |
| packets. | |
|
| |
A standard for serial interface connection. | ||
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| |
SIP | Session Initiation Protocol. An | |
| designed to work over IP networks. A SIP service defines | |
| the properties and the IP addresses of the SIP network | |
| components. | |
|
| |
Span | An ISDN line or leased line. A span may be of either T1 | |
| (United States) or E1 (Europe) type. Also called a circuit. | |
|
| |
SRTP | Encryption of SIP Media is supported using SRTP | |
| (Secured | |
| exchange method. | |
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| |
T1 Line | A 1.5Mb digital switched line used in the United States. | |
|
| |
ToS | Type of Service. ToS defines optimization tagging for | |
| routing audio and video packets. | |
|
| |
WAN | Wide Area Network. A communications network that | |
| services a geographical area larger than the LAN. | |
|
| |
Whiteboard | An | |
| documents. | |
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|