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Configuring ATM Logical Ports on Frame-based Modules
About ATM Logical Ports
ATM Services Configuration Guide for CBX 3500, CBX 500, GX 550, and B-STDX 9000 1/19/054-3
The following modules support direct trunk connections between a B-STDX 9000
switch and either a CBX 3500/CBX 500 or GX 550 switch:
• 1-port ATM CS DS3/E3
• 1-port ATM IWU OC-3c/STM-1
ATM OPTimum Cell Trunk
An OPTimum cell trunk is a virtual path that supports the transmission of VCC data.
Virtual circuits (VCs) may be established between any B-STDX 9000 and CBX
3500/CBX 500, or GX 550 user interface via B-STDX 9000 frame/cell trunks and
CBX 3500/CBX 500 or GX 550 cell trunks.
An OPTimum cell trunk establishes a single OSPF routing domain in a mixed network
that includes both B-STDX 9000 and CBX 3500/CBX 500 or GX 550 switches.
Routing decisions allow frame-based traffic to traverse either frame- or cell-based
trunks. Cell-based traffic is restricted to routes that traverse direct cell trunks.
OPTimum cell trunks have no Lucent trunk header. A unique VPI/VCI identifies the
circuit and controls traffic using a separate channel. A cell trunk uses a virtual path
through the ATM cloud as a trunk.
You can configure an ATM OPTimum cell trunk to create a switch-to-switch Lucent
trunk through a public data network (PDN) into another Lucent network. The Lucent
OPTimum trunk allows private enterprises to purchase low-cost, public-carrier
services as the trunk between two Lucent switches, rather than use a more expensive
leased-line service.
An OPTimum cell trunk enables you to create a trunk between either two
B-STDX 9000 switches or between a CBX 3500/CBX 500 or GX 550 and a
B-STDX 9000 switch. The following modules support OPTimum cell trunk
connections between B-STDX 9000 switches:
• 1-port ATM CS DS3/E3
• 1-port ATM IWU OC-3c/STM-1
• ATM UNI DS3/E3
The following modules support OPTimum cell trunk connections between a
B-STDX 9000 and either a CBX 3500/CBX 500 or GX 550 switch:
• 1-port ATM CS DS3/E3
• 1-port ATM IWU OC-3c/STM-1
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