RADIUS attribute from rfc4679

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Attainable-Data-Rate-Downstream

This Attribute contains the subscriber's attainable downstream
      data rate.  It MAY be included in Accounting-Request packets.

   A summary of the Attainable-Data-Rate-Downstream 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

      134 (0x86) for Attainable-Data-Rate-Downstream

   Vendor-Length

      6Value

      This field contains a 4-byte unsigned integer, indicating the
      subscriber's actual DSL attainable downstream data rate.  The rate
      is coded in bits per second.

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