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

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Agilent Technologies J3972A, J3919A manual Osi, Pais