| Annex A |
IP | Internet Protocol: The IP part of TCP/IP. IP implements the network |
| layer (layer 3) of the protocol, which contains a network address and |
| is used to route a message to a different network or |
| accepts packets from the layer 4 transport protocol (TCP or UDP), |
| adds its own header to it and delivers a datagram to the layer 2 data |
| link protocol. It may also break the packet into fragments to support |
| the Maximum Transmission / Transfer Unit (MTU) of the network. |
Intracoded Picture/Frame: A picture / frame, which is coded using | |
| purely intracoding with reference to no other field or frame |
| information. The I frame is used as a reference for other |
| compression methods. |
| IPPV | Impulse Pay Per View: |
| impulse) using a prearranged SMS credit line. |
| IRD | Integrated Receiver Decoder: The Receiver with an internal MPEG |
| Decoder, which is connected to the subscriber’s TV. The IRD is |
| responsible for receiving and |
| receives the incoming signal and if CA is active, decodes the signal |
| when provided with a control word by the viewing card. Domestic |
| IRDs are also known as |
| IRE | Institute of Radio Engineers: No longer in existence but the name |
| lives on as a unit of video amplitude measurement. This unit is 1% |
| of the range between blanking a peak white for a standard |
| amplitude signal. |
| ISDN | Integrated Services Digital Network: The basic ISDN service is BRI |
| (Basic Rate Interface), which is made up of two 64 kbps B channels |
| and one 16 kbps D channel (2B+D). If both channels are combined |
| into one, called bonding, the total data rate becomes 128 kbps and |
| is four and a half times the bandwidth of a V.34 modem (28.8 kbps). |
| The ISDN high speed service is PRI (Primary Rate Interface). It |
| provides 23 B channels and one 64 kbps D channel (23B+D), which |
| is equivalent to the 24 channels of a T1 line. When several channels |
| are bonded together, high data rates can be achieved. For example, |
| it is common to bond six channels for quality videoconferencing at |
| 384 kbps. In Europe, PRI includes 30 B channels and one D |
| channel, equivalent to an E1 line. |
| ISO | International Standards Organisation. |
| ISOG | |
| ITS | Insertion Test Signal: A suite of analogue test signals placed on |
| lines in the VBI. Also known as VITS. |
| ITT | Invitation To Tender. |
International Telecommunications Union - Radiocommunications | |
| Study Groups (was CCIR). |
International Telecommunications Union - Telecommunications | |
| Standardization Sector (was CCITT). |
EN/LZT 790 0005 R1A |