3Com REMOTE ACCESS SYSTEM 1500, Management Manual

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210 C
HAPTER
13: U
SING
F
RAME
R
ELAY
Table 56 Optional PVC Parameters
Parameter Term Description
bc_max
Maximum Committed Burst
Rate When BECN Monitoring is
enabled this value is used as
the starting point for Bc
calculations. Bc is the
number of bits a PVC is
allowed to burst above CIR
during a Committed Rate
Measurement Interval (Tc).
Any data in excess of Bc is
marked DE.
bc_min
Minimum Committed Burst
Rate This is lowest possible value
for Bc. The Bc algorithm may
not calculate a Bc lower than
bc_min.
be
Excess Burst Size The number of bits above Bc
that a PVC is allowed to
burst. All data above Bc is
marked DE. Any data in
excess of Be is discarded.
becn_cmp
Backward Explicit
Congestion Notification
Congestion Monitoring
Period The number of seconds in
each BECN Monitoring
Interval.
becn-monitoring
Backward Explicit
Congestion Notification
Monitoring Determines the ratio of BECN
frames to non-BECN frames
during a becn_cmp. If there
are more BECN frames than
non-BECN frames Bc is
adjusted lower.
cir
Committed Information
Rate The rate in bits per second
that the carrier guarantees
for a given PVC.
cir_monitoring
Committed Information
Rate Monitoring
I
f enabled, the RAS 1500 will
monitor the throughput for a
given PVC and calculate Bc in
conjunction with
becn_monitoring. If disabled
the PVC is allowed to send
data at up to the access line
rate.