Lucent Technologies CBX 3500 Configuration Manual page 193

Beta Draft Confidential
Table 4-19. Add Logical Port: Discard/Congestion Mapping Tab Fields
Congestion –
Egress
Congestion –
Ingress
ATM Services Configuration Guide for CBX 3500, CBX 500, GX 550, and B-STDX 9000
Configuring ATM Logical Ports on Frame-based Modules
Defining ATM Network Interworking for Frame Relay NNI Logical Ports
Field
Select one of the following options:
Mapped from FECN – (default) The value of the FECN bit is used to set
the EFCI bit when the frame is segmented into cells. The mapping takes
place just before the frame is presented to the hardware for segmentation.
Always 0 – The value of the EFCI bit is always set to zero (0) for all cells
segmented from all frames transmitted on this trunk.
Not mapped – The value of the EFCI bit is always set to zero (0),
ignoring the CLP setting received in the frame. This setting is transferred
to the egress card.
Note: Changing the value of this attribute does not admin down the
logical port.
Select one of the following options:
Mapped to FECN – (default) The value of the EFCI bit received in the
cells that comprise the ingress frame is transferred directly to the FECN
bit. The congestion bit is transferred with the frame to the egress card for
subsequent transmission. If the egress packet format is Frame Relay, then
the congestion bit is included in the Q.922 header as the FECN bit; if the
egress packet format is ATM, then the EFCI bit is set from the congestion
bit. Note that the egress card can modify the congestion bit due to
congestion.
Always 0 – The value of the congestion bit is always set to zero (0),
ignoring the setting of the EFCI bit in the cells that comprise the frame.
This setting is forwarded to the egress card along with the frame.
Note: Changing the value of this attribute does not admin down the
logical port.
Action/Description
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