VeEX MPA, User Manual

Page: 804 / 842

E
804
Dense Wavelength Division Multiplexing. The higher-capacity version of WDM, which is
a means of increasing the capacity of fiber-optic data transmission systems through the
multiplexing of multiple wavelengths of light.
E
EBS
Excess Burst Size. In Y.1564, EBS is the number of allocated bytes available for bursts
of ingress service frames sent at temporary rates above the CIR+EIR while remaining
EIR-conformant. Performance metrics in terms of
FTD , FDV and FLR are not applicable
to the frames that are transmitted at rates above the CIR but within the service EIR .
EC
Error Count. An incrementing value indicating the cumulative singular occurrences of
any specific error.
EFS
Error Free Seconds. A measurement of the time, in seconds, in which there were no
errors detected in the signal being monitored.
EFSR
Error Free Seconds Rate. A measurement of the time, in seconds, in which there were
no errors detected in the signal being monitored.
eHEC
Extended Header Error Checksum. Also known as Extension Header Error Control.
EIR
Excess Information Rate. In Y.1564, EIR can be interpreted as the maximum sustained
IR by which a user can exceed its
CIR with some expectation that the excess traffic
might be carried though the network.
EoS
Ethernet over SDH/SONET. A technique based on a group of industry standards
including SONET/SDH and virtual concatenation (VC), which is a recent extension to
ITU-T G.707 SDH standards. In combination, the specifications support the mapping
MPA_e_manual_D07-00-129P_RevA00