Rohde & Schwarz RTP Series - Ethernet 10 BASE-T and 100 BASE-TX (Option R&S RTP-K8); The Ethernet Protocol; Ethernet Configuration

Protocol analysis
R&S
®
RTP
627User Manual 1337.9952.02 ─ 12
13.9 Ethernet 10BASE-T and 100BASE-TX (option
R&S RTP-K8)
Twisted-pair Ethernet technologies are based on the family of standards IEEE 802.3,
issued by the Institute of Electrical and Electronics Engineers (IEEE).
R&S RTP-K8 is a firmware option that enables the R&S RTP to analyze Ethernet pro-
tocol variants 10BASE-T and 100BASE-TX, by decoding the signal and searching
within the decoded events. It is possible to trigger on 10BASE-T signals and 100BASE-
TX signals. The option is compatible with the standards IEEE 802.3i of 1990 (10BASE-
T) and IEEE 802.3u of 1995 (100BASE-TX).
● The Ethernet protocol............................................................................................627
● Ethernet configuration...........................................................................................627
● Ethernet trigger..................................................................................................... 632
● Ethernet decode results........................................................................................ 637
● Search on decoded Ethernet data........................................................................ 638
13.9.1 The Ethernet protocol
The two Ethernet protocol variants that R&S RTP-K8 can process have the following
features:
●
10BASE-T uses Manchester coding (or phase encoding, PE). In terms of a logical
Boolean operation, the Manchester value of each bit is the exclusive disjunction
(XOR) of the original data value and the clock value. A "0" is expressed by a high-
to-low transition, a "1" by a low-to-high transition. These transitions, which occur at
the middle of each bit period, make the signal self-clocked.
●
100BASE-TX uses a 4B5B multi-level transmit (MLT-3) encoding. The protocol
sequentially cycles through a sequence of the voltage levels -1 V, 0 V, +1 V, and
0 V. To transmit a "1" bit, MLT-3 moves to the next state; to transmit a "0" bit, it
stays in the same state. 4B5B block coding is used to map groups of four bits onto
groups of five bits. Also, the signal is scrambled.
All Ethernet-over-twisted-pair technologies use wires with four twisted pairs of cables
(and 8P8C connectors), but 10BASE-T and 100BASE-TX only require two pairs of
wires.
13.9.2 Ethernet configuration
13.9.2.1 Ethernet configuration settings
Access: [Protocol] >"Setup" tab > "Protocol" = Ethernet
Make sure that the tab of the correct serial bus is selected.
Ethernet 10BASE-T and 100BASE-TX (option R&S
RTP-K8)