RADIUS attribute from rfc4679

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Actual-Data-Rate-Upstream

This Attribute contains the actual upstream train rate of a
      subscriber's synchronized DSL link.  It MAY be included in both
      Access-Request and Accounting-Request packets.

   A summary of the Actual-Data-Rate-Upstream 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

      129 (0x81) for Actual-Data-Rate-Upstream

   Vendor-Length

      6

   Value

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

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