Triple-Play Service Deployment

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Glossary
I/F Interface
ICMP Internet Configuration Message Protocol. The protocol used to handle errors and
control messages at the IP layer. ICMP is part of the IP protocol
IEC International Electrotechnical Commission.
IEEE Institute of Electrical and Electronics Engineers
I-frame Intra-coded frame. A picture encoded without reference to any other picture. Iframes
provide a reference for predicted and bidirectionally predicted frames in a
MPEG-2 compressed video stream.
IGMP Internet Group Management Protocol. A signaling protocol typically used in
Broadcast IP video service.
IGMP Latency Elapsed time from sending an IGMP Join message until receipt of the first video
packet of the target broadcast video program stream.
IMA Inverse multiplexing for ATM as defined by the ATM Forum
INP Impulse Noise Protection
Index of Refraction See refractive index.
Insertion Loss The increase in the total optical attenuation caused by the insertion of an optical
component in the transmission path.
Integrated Receiver
Decoder (IRD)
A receiver with an MPEG-2 decoder, also known as set top box (STB).
Inter-Frame Prediction An MPEG-2 compression technique that periodically encodes a complete reference
frame and then uses that frame to predict the preceding and following frames.
Interoperability The ability of a system to use the parts or equipment of another system.
IP Internet Protocol.The network layer protocol for the Internet Protocol suite.
IP Address The 32-bit address (IPv4) assigned to hosts that want to participate in a TCP/IP
Internet communication. A 128 bit address in IPv6.
IP Video Packet based (IP) video service; sometimes called IPTV.
IRD Integrated Receiver Decoder. A receiver with an MPEG-2 decoder, usually located in
a headend. While the function is also in an STB, it is called a video decoder.
ISDN Integrated Services Digital Network
ISO International Standardization Organization
ITU International Telecommunications Union (UIT)
Jitter In video services, the variability in latency or delay in a data network of cells or data
packet follows. Jitter can be measured in many ways, but is typically a measure of
the packet delay variation at a given measurement point. In the context of MPEG-
2 video, see PCR Jitter.
Jumper A cable unit or cable element without connectors used to make a connection on a
cross-connect.