Cisco Headend System Release 2.7
Glossary
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78-745238-01 Rev D
M
MAC address
Media Access Control address. A unique physical address embedded into a network device.
Similar to a serial number.
modulator
A device that sends control and authorization information from the DNCS to the DHCT.
MPEG
Moving Picture Experts Group. An international video compression standards-setting group
working under the supervision of the International Standards Organization (ISO) and the
International Electrotechnical Commission (IEC). MPEG’s mission is to develop standards for
compressed full-motion video, still image, audio and other associated information.
MQAM
Multiple Quadrature Amplitude Modulation. A QAM that provides up to four 6 MHz
outputs while occupying only one unit of rack space. See also QAM, GQAM.
N
network elements
Devices typically located at the headend, which include satellite receivers (IRT, IRD), Real-
Time Encoder (RTE), BIG, QAM modulator, DNCS, and the application server. Also known as
system components.
O
OOB
Out-Of-Band. See FDC.
P
PAT
program association table. A second table in the transport stream which contains a list of all
MPEG programs on the transport stream along with their associated program numbers.
PID
packet/program identifier. A number assigned to MPEG transport packets to identify the
contents of the data and the information stream to which they belong. The 13-bit PID number
is assigned in the MPEG-2 transport packet headers. All packets from the same stream have
the same PID number.
PIN
personal identification number. A password used for identification.