Agilent Technologies J3919A Installation & User Manual page 172

byte of overhead information used for path management. The entire frame is
padded with either 13 or 14 nibbles of trailer to bring the transmission up to the
exact bit rate used.
DS3 was intended to accommodate clock slips so PLCP frames have to be padded
with variable amounts to accommodate the extra "stuff" bits DS3 needs inserted
for this clock slip feature. The C1 overhead byte indicates the length of the
padding.
The payload and the overhead functions are checked by a Bit Interleaved Parity
(BIP) function to measure errors and performance degradation. This performance
information is transmitted in the overhead.
Physical Medium Dependent (PMD)
This sublayer of the physical layer is concerned with bit timing, line coding and
electrical or optical transmission functions.
PL-OAM
Physical Layer Operations and Maintenance
PLCP BIP
Physical Layer Convergence Protocol Bit Interleaved Parity
PLCP FEBE
Physical Layer Convergence Protocol Far End Block Error
PRBS Errors
Errors in a selected PRBS pattern.
Private MIB
A proprietary MIB that has variables which are used for probe configuration and
control options.
Probe
A device on the LAN that monitors all frames and produces network management
information including current and historical traffic statistics and snapshots of
selected frames. Probes are also known as monitors.
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