FCM9002 USER MANUAL
76-02-095 Rev.B
Page 121 of 145
4.6.2.9.1 CIR
CIR, or Committed Information Rate is the guaranteed bandwidth that will be
supplied to the customer.
CIR is defined in bits per second and may range from 100k through to 1G
4.6.2.9.2 CBS
CBS, or Committed Burst Size is the guaranteed burst size that will be supplied
to the customer.
CBS is defined in bytes and ranges from the max packet size to 64kbytes.
4.6.2.9.3 EIR
EIR, or Excess Information Rate is an amount of extra bandwidth that the
operator may, but does not guarantee to, provide to the user.
EIR is defined in bits per second and may range from 100k through to 1G - CIR
4.6.2.9.4 EBS
EBS, or Excess Burst Size is extra burst capability that may be supplied to the
customer.
EBS is defined in bytes and ranges from the max packet size to 64kbytes.
4.6.2.9.5 Max Delay
The FCM9002 uses Y.1731 to measure the round trip delays and makes the
assumption that the link is symmetrical. The FCM9002 does not support direct
measurement of one way delays since it does not support clock synchronization
to GPS or other such master clock.
Y.1731 uses the DMM/DMR frames to determine the actual packet flight times for
the round trip, and reports the delays to sub microsecond accuracy.
The Max Delay configuration item defines the maximum one way delay ( half
round trip delay ) allowed by the SLA, above this delay and the device will
generate an alarm to indicate violation of the SLA.
