HP ProCurve Secure 7000dl Series Basic Management And Configuration Manual page 745

to send WAN traffic, BGP replaced it as the routing protocol for the Internet.
For more information about EGP, see RFC 827 (at http://www.ietf.org/rfc/
rfc0827.txt). See also BGP.
EIR Excess Information Rate. In a Frame Relay network, the EIR is the bandwidth,
in excess of the CIR, that the carrier attempts to deliver when the virtual circuit
is not congested. This rate is not guaranteed and is delivered on a best-effort
basis. See also CIR and Frame Relay.
Line Encoding A binary format for data transmission over a carrier-line. E-carrier systems
use HDB3 and AMI line encoding schemes; T-carrier systems use the B8ZS and
AMI line encoding schemes.
Encryption Scrambling data in such a way that it can be unscrambled only through the
application of the appropriate key.
See ECP.
Encryption
Control Protocol
Endpoint In a MLPPP connection, the endpoint discriminator allows the router to
Discriminator determine whether an incoming packet is part of an already established
multilink bundle or part of a new bundle. Aggregated links in a multilink
bundle share the same endpoint discriminator. See also MLPPP.
ESF Extended Superframe Format. Used on T-carrier lines, ESF combines 24
consecutive 193-bit frames into an extended superframe. ESF uses the 193rd
bit to provide maintenance and diagnostic functions.
ESP Encapsulating Security Payload. An IPSec security protocol that encrypts the
packet payload before transmission. ESP can also provide limited authentica-
tion services for the packet payload only. For more information about ESP,
see RFC 2406 (at http://www.ietf.org/rfc/rfc2406.txt). See also IPSec and VPN.
ETSI European Telecommunications Standards Institute. A standardization organi-
zation composed of equipment makers and network operators. For more
information about ETSI, visit the Web site at http://www.etsi.org/.
F
FDL Facility Data Link. In T-carrier lines that use the ESF frame format, this out-
of-band channel is used to transmit line diagnostics information. See also ESF.
FDM Frequency Division Multiplexing. A telecommunications technique in which
numerous voice channels are combined for transmission on a single physical
line. Each channel is assigned a different frequency (subchannel) spaced four
kHz apart and the composite signal is transmitted over the line. Modern
telecommunications systems using digital signaling and TDM instead of FDM.
Appendix B: Glossary
B-19