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List of terms

foreign address

An address or address prefix that does not match the summary addresses provisioned on any given node.

forward congestion indication (FCI)

A bit in the Nortel Multiservice Switch common header set to indicate that congestion was experienced by packets travelling through the Multiservice Switch network. Congestion in the subnet and at the access is indicated by BCI/FCI bits. The frame relay service at the node evaluates frames from the subnet for BCI/FCI bit indications, and based on this, sets the appropriate BECN/FECN bit on the frame sent to the user.

forward explicit congestion notification (FECN)

The FECN bit is used in the frame relay header of a frame to warn the receiving-end device that the frames it is receiving (traveling in the same direction) have encountered congestion or congested resources.

forward resource management cell (FRM)

Resource management cells that an ABR source sends to its destination. See resource management (RM) cell (page 113).

FP

See function processor (FP) (page 57).

frame

A variable length data unit, with an associated control header, that is transmitted across the network. The frame header determines the destination of the frame and carries sequencing and error detection information. Many frames are required to carry a complete document or message.

frame alignment signal (FAS)

A sequence of signal bits used for synchronizing E3 frames.

frame-cell trunk

The transport mechanism used by Nortel Multiservice Switch trunks to carry both frame and cell traffic on a frame-based interface.

HDLC mode is a provisionable mode in which a frame-cell trunk can operate and use HDLC framing.

Interrupting mode is a provisionable mode in which a frame-cell trunk can operate and use a modified HDLC-based framing. Interrupting mode allows highest priority data to interrupt traffic less sensitive to delay or traffic with a lower emission priority.

Nortel Multiservice Switch 7400/15000/20000

Terminology

NN10600-005 7.2S1 Standard

PCR7.2 and up March 2006

Copyright © 2006, Nortel

Nortel Confidential

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Panasonic 15000 Foreign address, Forward congestion indication FCI, Forward explicit congestion notification Fecn, Frame