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4-22 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
Table 4-9. Add Logical Port: ATM Tab Fields
Field Action/Description
Connection Class
Specifies the logical port connection type, either direct or
virtual. This field is set to Direct when you configure the first
UNI/NNI logical port on this physical port. Set to Virtual when
you configure subsequent UNI/NNI ports on this physical port.
Connection Type
Specifies whether this port connects to another switch or
endsystem, or to a router or host.
Network <-> Endsystem – Port connects to a router or host
(UNI-DCE ports only).
Network <-> Network – Port connects to another switch or an
end system.
The defaults are:
• DCE for Network to Endsystem
• DTE/NNI for Network to Network
Valid Bits VPI: (0-6)
Enter a value that is within the valid range for either the NNI or
UNI call header format.
For virtual logical ports, this field is read-only.
This field applies to VCCs only. Specify the number of bits used
in the ATM cell header for storing the VPI.
The total of both number of valid bits in VPI/VCI values cannot
exceed 12. The default of 4 is recommended; this setting enables
you to configure 15 OPTimum trunks, with up to 223 VCs on a
given VP. The valid range for the VPI field is 0-6. For more
information about setting these values, see page 4-5.
For ATM Network Interworking for FR NNI logical ports, enter
the VPI of the ATM VCC that carries the NNI data.
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