This object contains the actual maximum PDU
size that the local link station can send to
the adjacent link station. This object is
established from the value received in the XID
from the adjacent link station. If no XID
is received, then this value is implementation
dependent (for instance, it could be the value
of sdlcLSAdminMAXDATASend).
This value includes the Transmission Header
(TH) and the Request Header (RH).