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Configuring ATM Logical Ports on Frame-based Modules
Defining ATM UNI DCE/DTE Logical Ports
ATM Services Configuration Guide for CBX 3500, CBX 500, GX 550, and B-STDX 9000 1/19/054-23
Valid Bits VCI: (6-12)
Specifies the number of valid VCI bits for UNI DCE/DTE and
NNIs. Enter a value that is compatible with the desired VCI
range on the port.
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 VCI.
The total of both number of valid bits in VPI/VCI values cannot
exceed 12. The default of 8 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 VCI field is 6-12. For more
information about setting these values, see page 4-5.
For ATM Network Interworking for FR NNI logical ports, enter
the VCI of the ATM VCC used to carry the NNI data. (NNI is a
single ATM circuit that can be used to carry a single Frame
Relay circuit or many Frame Relay circuits multiplexed over a
single ATM circuit.)
Protocol
Select the ATM protocol. Options include:
• UNI 3.1 (default)
• UNI 3.0
UNI Type
Specifies whether this connection resides on a private or public
network.
Public (default) – At least one end of this connection attaches to
a public network.
Private – This connection resides completely within a private
network.
Cell Header Format
Controls the number of VPI bits in the ATM cell header for
VPCs.
UNI – If the value is UNI, 8 bits of VPI are used.
NNI – If the value is NNI, 12 bits of VPI are used.
Table 4-9. Add Logical Port: ATM Tab Fields (Continued)
Field Action/Description
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