
Understanding ATM DXI Concepts
117375-A Rev. A 2-9
Access Modes for ATM DXI Services
You can enable each ATM PVC to function in one of three access modes: group
access, direct access, or hybrid access. Within the same ATM physical interface
you can configure PVCs to use different modes. The following sections describe
the access modes.
Group Access Mode
In group access mode, upper-layer protocols treat each ATM network interface as
a single access point to the switched network. They use a single network address
to send all traffic destined for the switched network to the ATM network interface.
Figure 2-4 shows a conceptual drawing of group access mode (the default).
Figure 2-4. Group Access Mode
Group access supports the following protocols: IP, IPX, XNS, DECnet Phase IV,
AppleTalk, VINES, and transparent bridging. Of the three modes, group access
uses network addressing most efficiently and is the easiest to configure. Although
you need to configure each PVC manually for group access mode, you need only
define and associate protocols with the ATM network interface. All the group
access mode PVCs you configure for a given ATM interface carry the protocols
you select and configure to run on that interface.
Note: When you configure group access mode, the PVCs all use the AAL type
that you set for the ATM DXI interface (that is, the value of the CS PDU
Encapsulation parameter set in the ATM DXI Interface List window).
Site A
Upper layer
protocol
Site B
Site C
PVC
PVC
PVC
PVC
ATM
network
interface
Site D
ATM
network
ATM0010A
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