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4-34 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 UNI DCE/DTE Logical Ports
Priority Frame Attributes
When configuring frame-based cards, select the Priority Frame tab in the Add Logical
Port dialog box (Figure 4-7) and complete the fields as described in Table 4-13.
Figure 4-7. Add Logical Port: Priority Frame Tab
Table 4-13. Add Logical Port: Priority Frame Tab Fields
Field Action/Description
Service Class
Type
Mono-Class – (default) PVC traffic maps to a VFR-NRT service class.
Multi-Class – Allows PVC traffic to utilize all ATM services classes. You
must also specify Transmit Scheduling Mode.
VFR-RT
Negative
(Trunk logical
port types
only)
This checkbox becomes available if you select the Multi Class service
class.
Select the check box to enable this field. If enabled, the trunk can be
oversubscribed. This option is useful in cases where a trunk has failed
and PVCs must be rerouted to a new trunk. When this happens, trunk
bandwidth can become negative and service may be slow, but PVCs stay
up.
Clear the check box to disable this field (default). PVCs from the failed
trunk will not be rerouted and remain down; however, existing trunk
bandwidth and service remain stable.
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