Feature

CAN

TTP

ByteFlight

Kitten

Message Transmission

asynchronous

synchronous

asynchronous and synchronous

asynchronous and synchronous

Message Identification

message identifier

time slot

message identifier

message identifier

Data Rate

1 Mbps

2 Mbps

10 Mbps

100 Mbps

Bit Encoding

NRZ with bit stuffing

MFM

NRZ with start/stop bits

NRZ with bit stuffing

Physical Layer

transceivers up to 1 Mbps

not defined

optical transceiver up to 10 Mbps

not defined

Latency Jitter

bus load dependent

constant for all messages

constant for high priority messages

constant for high priority messages

Clock Synchronization

not provided

distributed, in 1sec range

by master, in 100 ns range

TBD

Tempral Composability

not supported

supported

supported for high priority messages

supported for high priority messages

Error Containment (physical layer)

partially provided

provided with special physical transceiver

provided by optical fiber and transceiver chip

provided with special physical transceiver

Babbling Idiot Avoidance

not provided

possible by independent bus guardian

provided via star coupler

possible by independent bus guardian

Extensibility

excellent

only if extension planned in original design

extension possible for high priority messages with effect on asynchronous messages

extension possible for high priority messages with effect on asynchronous messages

Bandwidth Flexibility

flexible bandwidth for each node

only one message per node and TDMA cycle

flexible bandwidth for each node

flexible bandwidth for each node

Availability of Components

several 1C families and transceiver chips

microcoded RISC chip available, physical transceiver and independent bus guardian not available

HC12BD32, E100.38 byteflight standalone controller, E100.39 star coupler ASIC, optical transceiver available

several 1C families and transceiver chips

Frame Size

1-8 bytes

1-240 bytes

1-12 bytes

1-256 bytes

Redundant Channels

no

2

no

variable number possible

Address Space

29 bits (message ID)

fixed at design time (by number of TDMA slots)

8 bits (message ID)

variable length (can be fixed for a given network)