Protocol analysis
R&S
®
RTO6
776User Manual 1801.6687.02 ─ 05
For information on how to configure the search results presentation and how to navi-
gate the search results, see also "T
o display search zoom windows"
on page 442.
13.18 Ethernet 100BASE-T1 (option R&S RTO6-K560)
100BASE-T1 is an Ethernet based protocol specialized for the needs of the automotive
industry, such as in the automotive networking applications, enabling advanced safety,
comfort and infotainment features within the automobile.
Its specifications, with reference to IEEE Standard 802.3-2012, were developed by the
OPEN (One-Pair Ether-Net) alliance under BroadR-Reach®.
BroadR-Reach is a Broadcom® point-to-point Ethernet physical layer (PHY) technol-
ogy. Therefore, 100BASE-T1 is also known as BroadR-Reach Physical Layer (BR-
PHY) or Open Alliance BroadR-Reach PHY (OABR PHY). For more details on the
specifications, refer to http://www.opensig.org/about/specifications/.
This option is compatible with the MII (IEEE 802.3 Clause 22) and IEEE 802.3 MAC
operating at 100Mbps.
● 100BASE-T1 basics..............................................................................................776
● 100BASE-T1 configuration....................................................................................777
● 100BASE-T1 trigger..............................................................................................782
● 100BASE-T1 decode results.................................................................................787
● Search on decoded 100BASE-T1 data.................................................................789
13.18.1 100BASE-T1 basics
The BR-PHY has the following objectives:
●
Provides a PHY that supports full duplex operating at 100 Mbps over a pair of
unshielded twisted pair (UTP) cable or better cable
●
Provides compatibility with the Media Independent Interface (MII) IEEE 802.3
Clause 22 and IEEE 802.3 Media Access Controller (MAC) operating at 100 Mbps
●
Achieves bit error rate (BER) of less than 1e
-10
To achieve the above objectives, 100BASE-T1 uses 1000BASE-T PHYs with parts of
IEEE 802.3 100BASE-TX in operation at 100 MBps and develops a new solution for
the PHY sublayers, i.e. Physical Coding Sublayer (PCS) and Physical Medium Attach-
ment (PMA) sublayer as follows:
●
Adopts full duplex communication of 1000BASE-T and therefore echo cancellation
on a single twisted-pair channel. This feature reduces cabling while preserving the
Ethernet MAC compatibility
●
Adopts Pulse Amplitude Modulation (PAM-3) encoding scheme with the following
encoding techniques:
– Data encoding is carried out via a 4b3b encoder that converts the MII data (4B
- four bits) with 25 MHz clock to three bits (3B) wide of data that is transmitted
during one 33.3 MHz clock period
Ethernet 100BASE-T1 (option R&S R
T
O6-K560)
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