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Beta Draft Confidential
About ATM Logical Ports
ATM NNI
ATM Services Configuration Guide for CBX 3500, CBX 500, GX 550, and B-STDX 9000
1/19/05
2-11
ATM NNI
The CBX 3500, CBX 500, and GX 550 ATM NNI logical port type enables you to
connect ATM-based public networks belonging to two different carriers. This logical
port type implements the B-ICI protocol, which facilitates the multiplexing of services
for inter-carrier (Regional Bell Operating Company [RBOC] and inter-exchange
carrier [IXC]) delivery. You can use an ATM NNI logical port as a feeder port for
Lucent OPTimum trunks and virtual UNIs.
ATM NNI logical ports also support the PNNI routing protocol. To configure PNNI
routing in your Lucent network, see
. For a detailed explanation of PNNI
routing, see the ATM Forum Technical Committee Private Network-Network Interface
Specification Version 1.0 (af-pnni-0055.000), available from the ATM Forum’s web
site:
http://www.atmforum.com
.
Virtual UNI/NNI
A virtual UNI/NNI forms an extension of the standard “direct” UNI DCE/DTE or NNI
logical port types. In an ATM network, you can use virtual UNI/NNI logical ports to
enable VP tunneling or to connect to a VP multiplexer. VP tunneling allows you to
connect two switches (using signaling) via a virtual path through the ATM network
(network-to-network connection class). See the example in
Figure 2-1.
Two Virtual UNIs Through Central Network
VP multiplexing enables you to connect a CBX 3500, CBX 500, or GX 550 switch to
a VP multiplexer using a direct UNI (or NNI) logical port on which you have
configured several “virtual” UNI (or NNI) ports. The VPI address range you define for
each virtual UNI/NNI port corresponds to a port on the VP multiplexer. This method
does not use VPCs and the configured logical port bandwidth can be used by any PVC
on any VPI (network-to-endsystem connection class). See the example in
ATM
CLOUD
A
B
DTE
DCE
DTE
DCE
VP
X
VP
Y
C
Содержание CBX 3500
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