Current method of export for metering data.
The enumerations are:
none(1) : Metering collection has not been enabled.
local(2) : Store the collected metering records locally
on the CMTS.
stream(3) : Stream the metering records to an external
collection or mediation server.
ipdr(4) : Stream the metering records to an ipdr (Internet
Proticol Detail Record)collector.