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NCT480 IP DSLAM User Guide YML856 Rev3
66 www.netcomm.com.au
Add Port & PVC
Click ‘Add’ button to create a new PVC of single or range of ADSL port interface.
A total of eight PVCs can be allowed under a single DSL port.
Figure 4-8 Add Port & PVC Dialog
Table 4-7 describes the Add PVC dialog.
Item Description
Port selection pull down menu
This specifies the ADSL port interface for ATM PVC configuration.
VPI
This specifies the virtual path identifier for use at DSL port interface.
Valid values: 0 ~ 255
VCI
This specifies the virtual circuit identifier for use at DSL port interface.
Valid values: 1 ~ 65535 (1 ~ 31 are reserved)
Type
Be sure to use the encapsulation method required by the ATU-R. The NCT480 IP-
DSLAM supports the following methods.
EOA: Ethernet over ATM. EoA benefits from SONET/SDH protection but has been
criticized for being expensive and having scalability issues. EoA offers smooth roll out
of Ethernet-based services in existing Asynchronous Transfer Mode ATM network and
optimizes the use of spare capacity in the ATM network.
IPOA: Some CPE devices have IPoA interfaces towards the WAN side. These interfaces
need to be supported and retained by the service providers. Also DSLAMs are moving
from ATM to Packet mode and hence support for these interfaces on the CPE side
becomes essential. In order to provide this flexibility in the route mode firmware release
R2.0, RFC 2684 Routed (IPoA) interfaces along with the existing RFC 2684 Bridged
Ethernet interfaces shall be supported.
PPPOA: PPPoA stands for Point to Point Protocol over ATM Adaptation Layer5 (AAL5). A
PPPoA connection functions like a dial-up Internet connection. The NCT480 IP-DSLAM
encapsulates the PPP session based on RFC1483 and sends it through an ATM PVC
(Permanent Virtual Circuit) to the CPEs. Please refer to RFC2364 for more information
on PPPoA. Refer to RFC1661 for more information on PPP.