Panasonic DX-2000 Service Manual page 299

Token Frame format
Data Frame format
Most significant bit
SFD Access
1 byte Control
1 byte
Data: Max 4429 byte (4M)
Max 17779 (16M)
There are several different bit types assigned for Frame Status. For example, 1 and 5 bit indicates that the token has been read, 2
and 6 bit indicates that the frame has been copied by another station. Thus, we can confirm whether the Data Frame was
delivered.
10.2.3 Ethernet
Ethernet is a very popular local area network architecture based on the CSMA/CD access method. The original ethernet specifica-
tion was the basis for the IEEE 802.3 specifications. Typically, ethernet networks can use a bus physical topology, although, many
varieties of ethernet such as 10Base-T uses a star physical topology and a bus logical topology. (Microsoft uses the term "star bus
topology" to describe 10Base-T)
10Base-5
10Base-T
100Base-TX
Logical speed
hyphen "-" means type of cable
no "-" means max length
Most significant bit
Start De-limiter (SFD)
1 byte
P: priority
S: Status
0 = Token Frame
1 = Data Frame
R: Reserved
Frame Destination
control MAC
1 byte 6 or 2 byte
Speed (bps) Topology
10M Bus
10M Star
100M Star
802.3 (CSMA/CD) Network Type
10 BASE
(Mbps)
10 BASE
Ethernet Configuration
Least significant bit
P P P S M R R R End De-limiter (ED)
1 byte
Source Data
MAC
6 or 2 byte
Cable type
Yellow cable
Twisted Pair (Cat. 3, 4, 5) 100 m (328 ft)
Twisted Pair (Cat. 5)
5
BASE: baseband (digital)
BROAD: broadband (analog)
- T
326
Least significant bit
FCS ED Frame
4 byte 1 byte Status
1 byte
Max length
500 m (1640 ft)
200 m (656 ft)
Max length (x 100m)
TP Twisted Pair