MT90220
LCD Remote Failure Indication (LCD-RFI) - The
LCD-RFI is reported to the FE when a link defect is
locally detected. The LCD-RFI defect is not always
required on the link interface.
given VC (e.g cell delay variation; cell transfer delay,
cell loss ratio).
Stuff Event - The Stuff Event is the repetition of an
ICP Cell over one IMA Link to compensate for a timing
difference with other links within the IMA Group.
Link Delay Synchronization (LDS) - The LDS is an
event indicating that the link is synchronized with the
other links within the IMA Group with respect to
differential delay.
Synchronous 1. The temporal property of being
sourced from the same timing reference.
Synchronous signals have the same fre-
quency, and a fixed (often implied to be
zero) phase offset.
Loss of IMA Frame (LIF) Defect - the LIF defect is the
occurrence of persistent OIF anomalies for at least
Gamma + 2 IMA Frames.
2. A mode of transmission in which
the sending and receiving terminal equip-
ment are operating continually at the
same rate and are maintained in a
desired phase relationship by an appro-
priate means.
Link Out of Delay (LODS) Synchronization Defect -
The LODS is a link event indicating that the link is not
synchronized with the other links within the IMA
Group.
Universal Test and Operations Physical Interface
for ATM (UTOPIA) - A PHY-level interface to provide
connectivity between ATM components.
Multi-Vendor Integration Protocol (MVIP) - MVIP
standards are designed to support the inter-operability
of products from different manufacturers and the porta-
bility of computer software between products from dif-
ferent manufacturers with the goal of facilitating new
and improved applications of computer and communi-
cations equipment.
Unusable - The Unusable State is a link state indicat-
ing that a link is not in use due to a fault, inhibition, etc.
Usable - The Usable State is a link state indicating the
link is ready to operate in the specified direction, but is
waiting to move to the Action State.
Out of Cell Delineation (OCD) Anomaly - As speci-
fied in ITU-T Recommendation I.432(30), an OCD
anomaly is reported when ALPHA consecutive cells
with incorrect HEC are received. It ceases to be
reported when DELTA consecutive cells with correct
HEC are received.
Virtual Channel (VC) - One of several logical connec-
tions defined within a virtual path (VP) between two
ATM devices; provides sequential, unidirectional trans-
port of ATM cells. Also Virtual Circuit.
Out of IMA Frame (OIF) Anomaly - The OIF is the
occurrence of an IMA anomaly as defined in the
Inverse Multiplexing for ATM Specification.
Glossary References:
The ATM Glossary - ATM Year 97 - Version 2.1, March
1997
Operational - The Operational State is a group state
that has sufficient links in both the transmit and receive
directions to carry ATM Layer cells.
The ATM Forum Glossary - May 1997
ATM and Networking Glossary
(http://www.techguide.com/comm/index.html)
Plesiochronous - The temporal property of being
arbitrarily close in frequency to some defined preci-
sion. Plesiochronous signals occur at nominally the
same rate, any variation in rate being constrained
within specific limits. Since they are not identical, over
the long term they will be skewed from each other.
This will force a switch to occasionally repeat or delete
data in order to handle buffer under-flow or overflow.
(In telecommunications, this is known as a frame slip).
Mitel Semiconductor Glossary of Telecommunications
Terms - May 1995.
Physical Layer (PHY) - Bottom layer of the ATM Ref-
erence Model; provides ATM cell transmission over the
physical interfaces that interconnect the various ATM
devices.
Quality of Service (QoS) - ATM performance parame-
ters that characterize the transmission quality over a
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