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List of terms
Nortel Multiservice Switch 7400/15000/20000
Terminology
NN10600-005 7.2S1 Standard
PCR7.2 and up March 2006
Copyright © 2006, Nortel Nortel Confidential
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.