Agilent Technologies J3972A - Manual (Page 169)

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Optical Bypass
An optical bypass switch that works in conjunction with a probe’s Bypass Power
connector to maintain the network link even when a probe has an interruption in
power.
OSI
Open Systems Interconnect. The 7 level communications structure promoted by
ISO.
Packet
A bit stream consisting of predefined fields that contain data, addresses, and
control information. In the IEEE 802.3 environment, this structure is often
referred to as the MAC frame. Packet is used in the Ethernet environment and is
used in this guide because it is the more commonly understood term. Different
protocols have different packet and frame specifications.
PAIS
Path Alarm Indication Signal
Pass-Through
The method of connecting Agilent Probes so that additional hub ports or an
additional hub is not required to monitor a connection. Some probe options are
designed to support the pass-through mode and allow the probe to be connected
between a server and a switch or between two switches without requiring an extra
hub.
Path
A logical connection between the point at which a standard frame format for the
signal at the given rate is assembled, and the point at which the standard frame
format for the signal is disassembled.
Path AIS
Path Alarm Indication Signal
Path FEBE
Path Far End Block Error