RADIUS attribute from rfc4679

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Minimum-Data-Rate-Upstream-Low-Power

This Attribute contains the subscriber's minimum upstream data
      rate in low power state, as configured by the operator.  It MAY be
      included in Accounting-Request packets.

   A summary of the Minimum-Data-Rate-Upstream-Low-Power Attribute
   format is shown below.  The fields are transmitted from left to
   right.

    0                   1                   2                   3
    0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |  Vendor-Type  | Vendor-Length |            Value
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
              Value (cont'd.)      |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

   Vendor-Type

      137 (0x89) for Minimum-Data-Rate-Upstream-Low-PowerVendor-Length

      6

   Value

      This field is a 4-byte unsigned integer, indicating the numeric
      value of the subscriber's DSL minimum upstream data rate when in
      low power state (L1/L2).  The rate is coded in bits per second.

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