
Enterasys Xpedition User Reference Manual 57
Cell Scrambling
service <string>Specifies the name of the service profile definition which you want to
apply. The maximum length is 32 characters.
port <port list> Specifies the port, in the format: media.slot.port.vpi.vci
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.
vpi Specifies the Virtual Path Identifier. This parameter identifies the virtual
path. This parameter is optional.
vci Specifies the Virtual Channel Identifier. This parameter identifies the
virtual channel. This parameter is optional.
An important concept when applying service profile definitions is the concept of
inheritance. Since a service profile definition can be applied to a virtual channel, virtual
path, or an ATM port, the actual connection can inherit the service profile definition from
any one of the three. The virtual channel will inherit the service profile definition that is
directly applied on it. If no service profile was applied to the virtual channel, the
connection will inherit the service profile applied to the virtual path. If no service profile
definition was applied to the virtual path, then the connection will inherit the service
profile applied to the ATM port. If no service profile was applied to the port, then the
default service class UBR is applied.
Cell Scrambling
Cell scrambling is useful for optimizing the transmission density of the data stream. Since
all transmissions use the same source clock for timing, scrambling the cell using a random
number generator converts the data stream to a more random sequence. This ensures
optimal transmission density of the data stream.
Enabling Cell Scrambling
This command allows you to enable cell scrambling for the PDH (plesiochronous digital
hierarchy) physical (PHY) interfaces available on the ATM line card, such as T1, T3, E1,
and E3 PHYs.
Note: For cell scrambling on the SONET PHY interfaces, refer to the SONET commands.
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