Panasonic 1200N manual End Station, Entry Border Node, Epd, Esd, Esf

E Glossary

EN

European Norm

End Station

These devices (e.g., hosts or PCs) enable the communication between ATM end stations and end stations on "legacy" LAN or among ATM end stations.

Entry Border Node

The node which receives a call over an outside link. This is the first node within a peer group to see this call.

EPD

Early Packet Discard: A congestion control technique that selectively drops all but the last ATM cell in a Classical IP over ATM packet.When congestion occurs, EPD discards cells at the beginning of an IP packet, leaving the rest intact.The last cell is preserved because it alerts the switch and the destination station of the beginning of a new packet.Because IP packets from cells have been discarded receive no acknowledgment from the source. Most vendors expect EPD to be used in conjunction with unspecified bit rate (UBR) service. Switches simply junk UBR cells when congestion occurs, without regard for application traffic.By discarding ceiling selectively. so that whole IP packets are resent, EPD makes UBR a safer option.

ER

Explicit Rate: The Explicit Rate is an RM-cell field used to limit the source ACR to a specific value. It is initially set by the source to a requested rate (such as PCR). It may be subsequently reduced by any network element in the path to a value that the element can sustain. ER is formatted as a rate.

ES

End System: A system where an ATM connection is terminated or initiated. An originating end system initiates the ATM connection, and terminating end system terminates the ATM connection. OAM cells may be generated and received.

ESD

Elastic Discharge

ESF

Extended Superframe: A DS1 framing format in which 24 DS0 times lots plus a coded framing bit are organized into a frame which is repeated 24 times to form a superframe.

B-26	Centillion 1200N ATM Switch User Manual
	NTP 297-8103-903