Panasonic Panafax DX-2000, Service Manual

Page: 299 / 322

326
Token Frame format
Data Frame format
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)
Most significant bit Least significant bit
Start De-limiter (SFD)
1 byte P P P S M R R R End De-limiter (ED)
1 byte
P: priority
S: Status
0 = Token Frame
1 = Data Frame
R: Reserved
Most significant bit Least significant bit
SFD
1 byte Access
Control
1 byte Frame
control
1 byte Destination
MAC
6 or 2 byte Source
MAC
6 or 2 byte Data FCS
4 byte ED
1 byte Frame
Status
1 byte
Data: Max 4429 byte (4M)
Max 17779 (16M)
Speed (bps) Topology Cable type Max length
10Base-5 10M Bus Yellow cable 500 m (1640 ft)
10Base-T 10M Star Twisted Pair (Cat. 3, 4, 5) 100 m (328 ft)
100Base-TX 100M Star Twisted Pair (Cat. 5) 200 m (656 ft)
802.3 (CSMA/CD) Network Type
10 BASE 5
10 BASE - T
Logical speed
(Mbps)
BASE: baseband (digital)
BROAD: broadband (analog)
Max length (x 100m)
TP Twisted Pair
hyphen "-" means type of cable
no "-" means max length
Ethernet Configuration