Digi PortServer II

Page 246 Glossary 90030500B
CFM
Cubic Feet per Minute
Channel
A communication path. Multiple channels can be multi-
plexed over a single cable in certain environments.
CHAP
Challenge Handshake Authentication Protocol. A method
of authenticating a connection request on a PPP port. See
also PAP.
CIR
Committed Information Rate. See
Chapter 14, Configur-
ing Frame Relay
.
CSLIP
Compressed Serial Line Interface Protocol. This is
SLIP
data with Van Jacobsen compression applied to the TCP
packets headers.
CU
A command on Unix systems that allows you to log in to
and use another system, while remaining logged into your
home system.
Dial-up connection
Communications circuit that is established by a switched
circuit connection using the telephone network
DLCI
Data Link Connection Identifier. Used on Frame Relay
networks to identify a particular virtual connections. A
DLCI identifies a bi-directional circuit, not a destination or
source. It may be changed by each Frame Relay switch
that handles traffic associated with the connection. See
Chapter 14, Configuring Frame Relay
.
DNS
Domain Name Service. A method of providing network
devices with names, rather than numerical addresses.
EBI
External Bus Interface, a Digi International standard for
connecting external modules to devices such as PortServer
II.
Ethernet
A baseband LAN, operating at 10 Mbps using CSMA/CD
to operate over coaxial cable. Ethernet is similar to
IEEE
802.3
standards.
FCC
Federal Communications Commission.
FCN
Forward Congestion Notification. See
Chapter 14, Con-
figuring Frame Relay
.
Flash ROM
A non-volatile storage device that can be electrically
erased in-circuit and reprogrammed.