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APPENDIX
address, ff-ff-ff-ff-ff-ff.
•
Bundle - A group of signals which have a common set of characteristics and differ only in their information
content.
•
Capture effect - Under heavy load, if at least one of the contending stations is capable of transmitting back-to-
back packets continuously, that station can capture the network for long periods. This occurs because, once a
station has succeeded in transmitting, it zeroes its attempts counter, so its next maxBackOff will be set to 2.
Other stations, however, will continue to increment their attempts counters, causing their maxBackOff variables
to grow exponentially. The network still carries traffic at its full rate (except for second-order effects), but its
arbitration has become unfair.
•
CCITT - Consultative Committee for International Telephony and Telegraphy. Renamed ITU.
•
Cheapernet - 185-meter-per-segment Ethernet. Also, 10BASE2.
•
CSMA/CD - Carrier Sense Multiple Access with Collision Detection. Used by Ethernet.
•
CDDI - Copper Distributed Data Interface. FDDI without the fiber.
•
CO - Central Office.
•
CRC - Cyclic Redundancy Code. Called Cyclic Redundancy Check in IEEE 802.3 document.
•
DCE - Data Communications Equipment.
•
DS0 - 64-Kbit/s asynchronous rate. One voice channel.
•
DS1 - 1.544 Mbit/s asynchronous rate. 24 DS0 signals. T1 equipment and cable carry DS1 rate and format
between COs.
•
DS2 - 6.312 Mbit/s asynchronous rate. Four DS1 signals.
•
DS3 - 44.736 Mbit/s asynchronous rate. 28 DS1 signals. T3 equipment and cable carry DS3 rate and format
between COs.
•
DMA - Direct Memory Access.
•
Dribble - When the Mac receives a frame that is not an integer number of bytes long. Dribble produces an
alignment error when the CRC is invalid.
•
DTE - Data Terminal Equipment. If the AUI is not exposed, this is the PLS and up. See OSI.
•
EFD - The End of Frame Delimiter <EFD> indicates the end of a transmission. For the MII, deassertion of the
Tx_en signal constitutes an end of frame delimiter.
•
Fast Ethernet group - 100-Mbit/s CSMA/CD Ethernet proposal C.f. 100BASE-VG or AnyLAN. Supported by
approximately 30 companies, including Grand Junction Networks Inc., Sun Microsystems Inc., 3Com corp.,
Cabletron Systems Inc., and Synoptics Communications Inc.
•
FCS - Frame Check Sequence. Also, CRC.
•
FDDI - Fiber Distributed Data Interface. Fiber-optic Data Distribution Interface. 100 Mbit/s.
•
FIFO - First-In, First-Out data buffer. Also, silo or queue.
•
Fragment - A frame that is less than 64 bytes (minFrameSize) long, exclusive of preamble and SFD. Presumed
to be the result of a collision, fragments are discarded and are not reported as an error. Also, runt packet.
•
Frame - A frame is everything in a packet except the preamble and the start frame delimiter: destination and
source addresses, length, LLC data, padding, and frame check sequence.
•
Framing error - See alignment error, dribble.
•
Gateway - A device connecting networks that performs some protocol conversion.
A-2
KS8910 100/10 Mbps ETHERNET TRANSCEIVER
Preliminary Spec. ver
1.4
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