17 GLOSSARY |
|
TERM | DEFINITION |
| Network connection scheme used in the traditional PSTN |
| telephone network, where each connection requires a |
| dedicated path for its duration. An alternative is |
Class C | An IP network containing up to 253 hosts. Class C IP addresses |
network | are in the form “network.network. network. host.” |
client | In a client/server architecture, a client is a computer that |
| requests files or services, such as file transfer, remote login, or |
| printing from the server. Also called a CPE. |
| On a WLAN, a client is any host that can communicate with |
| the access point. A wireless client is also called a “station.” |
CMTS | A cable modem termination system is a device in the cable |
| system headend that interfaces the HFC network to local or |
| remote IP networks to connecting IP hosts, cable modems or |
| gateways, and subscribers. It manages all cable modem |
| bandwidth. It is sometimes called an edge router. |
CNR | carrier to noise ratio |
coaxial cable | A type of cable consisting of a center wire surrounded by |
| insulation and a grounded shield of braided (coax) wire. The |
| shield minimizes electrical and radio frequency interference. |
| Coaxial cable has high bandwidth and can support transmission |
| over long distances. |
CoS | Class of service traffic management or scheduling functions are |
| performed when transferring data upstream or downstream on |
| HFC. |
CPE | Customer premise equipment, typically computers, |
| printers, etc., are connected to the cable modem or |
| gateway at the subscriber’s location. CPE can be provided by |
| the subscriber or the Internet Service provider. Also called a |
| client. |
crosstalk | An undesired signal interfering with the desired signal. |
CSMA/CD | Carrier sense multiple access with collision detection |
D
TERM | DEFINITION |
datagram | In RFC 1594, a datagram is defined as “a |
| independent entity of data carrying sufficient information to be |
| routed from the source to the destination computer without |
| reliance on earlier exchanges between this source and |
| destination computer and the transporting network.” For the |
| most part, it has been replaced by the term packet. |
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