21.1.3 Abbreviations Used
Abbreviation Meaning
AL Application Layer: the protocol that directly used by the process entities.
Cat Category – classification for cables that is also used in Ethernet.
DC Distributed Clocks Mechanism to synchronize EtherCAT slaves and master
DL Data Link(=Layer 2). EtherCAT uses Ethernet, which is standardized as IEEE 802.3.
FPGA Field Programmable Gate Array
FTP File Transfer Protocol
HW Hardware
ICMP Internet Control Message Protocol: Mechanisms for signaling IP errors.
IEC International Electrotechnical Commission: The international standards
IEEE Institute of Electrical and Electronics Engineers, Inc.
LLDP Link Layer Discovery Protocol
MAC Media Access Control
MII Media Independent Interface: Standardized interface Ethernet controller <-> routing equipment.
MDI Media Dependant Interface: Use of connector Pins and Signaling.
MDI-X Media Dependant Interface (crossed): Use of connector Pins and Signaling with crossed lines.
OSI Open System Interconnect
OUI Organizationally Unique Identifier – the first 3 Bytes of an Ethernet-Address, that will be assign to
companies or organizations and can be used for protocoll identifiers as well (e.g. LLDP)
PDI Physical Device Interface: set of elements that allows access to ESC from the process side.
PDO Process Data Object
PDU Protocol Data Unit: Contains protocol information transferred from a protocol instance of trans-
parent data to a subordinate level
PHY Physical interface that converts data from the Ethernet controller to electric or optical signals.
PLL Phase Locked Loop
PTP Precision Time Protocol in accordance with IEEE 1588
RSTP Rapid Spanning Tree Protocol
RT Real-time, can be run in Ethernet controllers without special support.
RX Receive
RXPDO Receive PDO
SNMP Simple Network Management Protocol
SPI Serial Peripheral Interface
Src Addr Source Address: Source address of a message.
STP Shielded Twisted Pair
TCP Transmission Control Protocol
TX Transmit
TXPDO Transmit PDO
UDP User Datagram Protocol: Non-secure multicast/broadcast frame.
UTP Unshielded Twisted Pair
ZA ECAT Access mode EtherCAT
ZA Drive Acces mode drive
AKD User Guide |
Kollmorgen | December 2010 32
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