/**
 * \ingroup devices
 * \defgroup PointToPoint Point-to-Point Models
 *
 * \section Point-to-Point Models
 *
 * The set of Point-to-Point models provides an abstrated point-to-point link
 * model, that simulates transmission delay (finite data rate) and 
 * propagation delay, and can also optionally include an error model
 * (ns3::ErrorModel).
 */