mt90226ag ETC-unknow, mt90226ag Datasheet - Page 88

• Manufacturer Part Number: mt90226ag
• Description: 16/8 Port Tc Phy Device
• Manufacturer: ETC-unknow

88
Out of Cell Delineation (OCD) Anomaly - As specified 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.
Plesiochronous - The temporal property of being arbitrarily close in frequency to some defined precision. Plesio-
chronous 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 oc-
casionally repeat or delete data in order to handle buffer under-flow or overflow. (In telecommunications, this is
known as a frame slip).
Physical Layer (PHY) - Bottom layer of the ATM Reference Model; provides ATM cell transmission over the phys-
ical interfaces that interconnect the various ATM devices.
Quality of Service (QoS) - ATM performance parameters that characterize the transmission quality over a given
VC (e.g cell delay variation; cell transfer delay, cell loss ratio).
Synchronous 1. The temporal property of being sourced from the same timing reference. Synchronous signals
Universal Test and Operations Physical Interface for ATM (UTOPIA) - A PHY-level interface to provide connec-
tivity between ATM components.
Virtual Channel (VC) - One of several logical connections defined within a virtual path (VP) between two ATM de-
vices; provides sequential, unidirectional transport of ATM cells. Also Virtual Circuit.
Glossary References:
The ATM Glossary - ATM Year 97 - Version 2.1, March 1997
The ATM Forum Glossary - May 1997
ATM and Networking Glossary
(http://www.techguide.com/comm/index.html)
Mitel Semiconductor Glossary of Telecommunications Terms - May 1995.
have the same frequency, and a fixed (often implied to be zero) phase offset.
continually at the same rate and are maintained in a desired phase relationship by an appropriate
means.
2. A mode of transmission in which the sending and receiving terminal equipment are operating
Zarlink Semiconductor Inc.
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