41. The physical layer of HiperLAN / 2 is very similar to IEEE 802.11a wireless local area networks. 42. The ICAO standard for the VDL Mode 2 specifies three layers, the subnetwork, link and physical layers . 43. Some taps operate at the physical layer of the OSI model rather than the data link layer. 44. Convergence sublayers can be used also on the physical layer to connect IP, ATM or UMTS networks. 45. It is typically measured at a reference point below the network layer and above the physical layer . 46. An uncertified physical layer that malfunctions could cripple the battery lifespan of other devices on a ZigBee network. 47. In addition, Bell 202 is the basis for the most commonly used physical layer for the process industries. 48. The interface between the physical layer and the actual transmission medium is called Medium Dependent Interface ( MDI ). 49. The interface between the Data Link Layer and the physical layer is called Medium Independent Interface ( MII ). 50. The physical layer is EIA-422.
