RADIUS attribute from rfc4679

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Maximum-Data-Rate-Downstream

This Attribute contains the subscriber's maximum downstream data
      rate, as configured by the operator.  It MAY be included in
      Accounting-Request packets.A summary of the Maximum-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

      136 (0x88) for Maximum-Data-Rate-Downstream

   Vendor-Length

      6

   Value

      This field is a 4-byte unsigned integer, indicating the numeric
      value of the subscriber's DSL maximum downstream data rate.  The
      rate is coded in bits per second.

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