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Hybrid Fiber/Coaxial
(HFC) network
Initial Maintenance (IM) A contention interval that provides an opportunity for modems to join a
Internet
IP address
IP filtering
IP network
Local Area Network
(LAN)
MAC Layer Domain
Maximum Transmission
Unit (MTU)
Mbps
A device used to connect multiple devices to a LAN or similar structure to a
headend.
A network where the trunk of the cable plant is fiber technology. The fiber is
connected to a coaxial cable and the signal is converted so that it is compatible
to that media. The coaxial cable runs through the branches of the network and
is dropped into the subscriber's home.
network.
A collection of interconnected networks used for world-wide communications.
These networks use the TCP/IP protocol.
A 32-bit address assigned to every device in a network. An IP address has two
parts: a network address and a host address. Each network is assigned an
address by a governing agency, and each company administrator assigns an
address to each host. Network addresses can be 8, 16, or 24 bits long
corresponding to classes A, B, and C, respectively, with the host address
occupying the remainder of the 32 bits. If a service provider uses Class C
addresses, for example, the first 24 bits are the network address and 8 bits are
used for host addresses.
An IP network address can be further divided by using classless addressing or
subnetting. See subnet.
IP filtering allows IP packets to be dropped according to information in the
packet, such as its source or destination address. IP filtering can prevent
subscribers from accessing headend servers, enforce subscribers to log on to
the cable network, enforce separately-billed service packages for data, and
provide group access control for IP Multicast.
A group of IP routers that route IP datagrams. These routers are sometimes
referred to as internet gateways. Single users access the IP network from a host.
Each individual network in the Internet includes some combination of hosts
and IP routers.
A privately owned and administered network for data communications. A LAN
provides a relatively high bandwidth over a limited geographical area for
communication among the attached devices, typically personal computers and
servers. Communication is usually accomplished by broadcasting on a
connectionless basis over a shared media.
A collection of upstream and downstream channels for which a single Media
Access Control (MAC) Allocation and Management Protocol operates. Its
attachments include one CMTS and a number of cable modems.
The largest amount of data that can be transmitted in one discrete message on a
physical network. MTUs can be user configurable.
Mega (million) bits per second. A rate of data transfer.
Glossary-3
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