Nadir camera rigging that utilizes more than 2 lenses to capture 360º footage, the nadir location follows the same logic as the astronomical definition in that it is located opposite of the zenith, or in the same direction as the gravitational pull in relation to the camera rigging. Nadir The nadir (, ; from / ALA-LC: "naẓīr", meaning "counterpart") is the direction pointing directly "below" a particular location; that is, it is one of two vertical directions at a specified location, orthogonal to a horizontal flat surface there. Since the concept of "being below" is itself somewhat vague, scientists define the
Point-to-Point Protocol over Ethernet PPPoE payload "across the Ethernet link to a router" (or PPPoE-speaking single PC), PPP + PPPoE contributes an additional overhead of 8 bytes = 2 (PPP) + 6 (PPPoE) included within the payload of each Ethernet frame. This added overhead can mean that a reduced maximum length limit (so-called "‘MTU’" or "‘MRU’") of 1500 - 8 = 1492 bytes is imposed on (for example) IP packets sent or received, as opposed to the usual 1500-byte Ethernet frame payload length limit which applies to standard Ethernet networks. Some devices support RFC 4638, which allows negotiation for the use of non-standard Ethernet