Cell Mapping

The following is a description of the parameters used to enable cell scrambling:

port <port list> Specifies the port, in the format: media.slot.port. Specify all-portsto enable cell scrambling on all ports.

media Specifies the media type. This is at for ATM ports.

slot Specifies the slot number where the module is installed.

port Specifies the port number.

pdh-cell-scramble onoff

Specify on to enable cell scrambling. Specify off to disable cell scrambling.

Cell Mapping

The ATM cells are mapped into a PDH (E3, T3, E1) frame using two different mapping formats. The two mapping formats available are direct ATM cell mapping and physical layer convergence protocol (PLCP) mapping.

Selecting the Cell Mapping Format

To select a cell mapping format on an ATM port, enter the following command in Configure mode:

Selects a cell mapping format on an ATM port.

atm set port <port list> cell-mapping direct plcp

The following is a description of the parameters used to select the cell mapping format:

port <port list> Specifies the port, in the format: media.slot.port. Specify all-portsto select the cell mapping format for all ports.

media Specifies the media type. This is at for ATM ports.

slot Specifies the slot number where the module is installed.

port Specifies the port number.

cell-mapping directplcp

Specify direct to select direct ATM cell mapping. Specify plcp to select PLCP mapping.

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SmartSwitch Router User Reference Manual

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Cabletron Systems 9032578-05 manual Selecting the Cell Mapping Format, Pdh-cell-scramble onoff, Cell-mapping directplcp