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Figure 39. Port States Table
The fields of the Port States Table are described next.
Bridge Port
One of the characteristics of a databridge is the number of ports it supports. A bridge port is the logical equivalent of an interface. By default, the ADSL modem supports one local port (Ethernet interface) and four remote ports. The remote ports are mapped on the virtual ATM connections of the ADSL line. Only the remote ports are displayed in the table and are indicated as ADSL Port 0, 1, 2, and 3.
Encap
This field indicates the encapsulation of Ethernet or IEEE 802.3 frames to AAL5/ATM protocol.
The ADSL modem supports both the LLC/SNAP method and the VC MUX method for bridged Ethernet V2.0/IEEE 802.3 PDUs. By default, this field is set to LLC/SNAP, and the access server of the ISP or corporate network must use the same method. If it does not, contact the ISP or corporate network administrator.
FCS
This field indicates whether the last four bytes of the MAC frames are preserved or not. By default, the FCS of a MAC frame is not preserved and is set to NO. If the ISP or corporate network requires the FCS to be preserved over the ADSL connection, enter YES in this field.
VPI/VCI
VPI and VCI values identify an ATM virtual connection. Because the modem comes with preconfigured VPI/VCI values, you do not have to configure these fields.
However, if the ISP or corporate network administrator require VPI/VCI values different from the default values, you must enter these specific values in this field.