MT90220
SAR
Segmentation and Reassembly
Status and Control Change Indication
Start of Cell
List of Abbreviations and Acronyms
SCCI
SOC
AAL
ATM
CBR
CDV
CPE
CRC
CTC
DSU
FE
ATM Adaptation Layer
Asynchronous Transfer Mode
Constant Bit Rate
TC
Transmission Convergence
Timing Reference Link
TRL
Cell Delay Variation
TRLCR
UTOPIA
Timing Reference Link Cell Rate
Customer Premises Equipment
Cyclic Redundancy Check
Common Transmit Clock
Data Service Unit
Universal Test and Operations Physical
Interface for ATM
UNI
User Network Interface
ATM Glossary
Far End
GSM
GTSM
HEC
IDCR
I/F
Group State Machine
Group Transmit State Machine
Header Error Control
IMA Data Cell Rate
Asynchronous Transfer Mode Adaptation Layer
(AAL) - Standardized protocols used to translate
higher layer services from multiple applications into
the size and format of an ATM cell. Individual
protocols are indexed as per the examples below:
AAL0 - Native ATM cell transmission propri-
etary protocol featuring 5-byte header and 48-
byte user payload.
Interface
IFSM
IMA
ISDN
ITC
Ima Frame State Machine
Inverse Multiplexing for ATM
Integrated Services Digital Network
Independent Transmit Clock
Loss of Cell Delineation
Link Identification
AAL1 - Used for the transport of constant bit
rate, time-dependent traffic (e.g. voice, video);
requires transfer of timing information between
source and destination; maximum of 47-bytes
of user data permitted in payload as an addi-
tional header byte is required to provide
sequencing information.
LCD
LID
LIF
Loss of IMA Frame
AAL5 - Usually used for the transport of vari-
able bit rate, delay-tolerant data traffic and sig-
nalling which requires little sequencing or
error-detection support.
LODS
LOF
LOS
LSM
M
Link Out of Delay Synchronization
Loss Of Frame
Loss of Signal
Link State Machines
Active - This is a link state indicating the link is
capable of passing ATM Layer cells in the specified
direction.
IMA Frame Size
MIB
MVIP
NE
Management Information Base
Multi-Vendor Integration Protocol
Near End
Aligned - IMA Frames are said to be aligned if they
are transmitted simultaneously.
OAM
Operations, Administration and
Maintenance
Asynchronous
1. Not synchronous; not periodic.
OCD
OIF
Out of Cell Delineation (anomaly)
Out of IMA Frame (anomaly)
Plesiochronous Digital Hierarchy
Physical Layer
2. The temporal property of being sourced from
independent timing references, having different
frequencies and no fixed phase relationship
3. In telecommunications, data which is not
synchronized to the public network clock.
4. The condition or state of being unable to
determine exactly when an event will transpire prior
to its occurrence.
PDH
PHY
PMD
QoS
RAI
Physical Medium Dependent
Quality of Service
Remote Alarm Indication
Remote Defect Indication
Remote Failure Indication
RDI
Asynchronous Transfer Mode (ATM) - A method of
organizing information to be transferred into fixed-
RFI
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