12.0 Ethernet over OTN (EoOTN)
ODU0, ODUflex, OTU2e and OTU1e are commonly used for Ethernet over OTN (EoOTN) transport applications.
12.1 ODU0 and ODUflex Overview
ODU0 (1.25 Gbps) can accommodate a 1GE client transparently. As its name implies, ODUflex adds flexibility in the data rate
and is capable of carrying Nx1.25 Gbps payloads, including Ethernet. Refer to VeEX's OTN Reference Guide, QG20, for a
technological overview of ODU0 and ODUflex.
12.2 ODU0 and ODUflex Setup Menu
12.2.1 Signal Setup
Signal Setup for ODUflex (Ethernet)
Soft LED Indicators
For OTN Mapping modes with Ethernet payload testing,
OTN
and
ETH
refer to the test signal health status while
P1
or
P2
indicates the port in operation.
Tap on the
Signal
tab to set up the Transmitter and Receiver interfaces and associated test parameters prior to running a test.
Network Type:
This is applicable to OTN links only.
Test Rate:
OTU1 (2.7 Gbps) or OTU2 (10.7 Gbps) test interface selection.
OTN Mapping:
These are the different test payload options available, including basic PRBS (Bulk) and Ethernet. OTU2
interfaces can carry lower rate payloads (e.g. 1GE) by multiplexing multiple ODU0s (e.g. OTU1-ODU1-ODU0-1GE, OTU2-
ODU2-ODU0-1GE, or OTU2-ODU2-ODU1-ODU0-1GE).
When Bulk is selected, the test set runs a typical BER test, filling the payload with the selected test pattern.
When an Ethernet payload is selected, then ethernet-centric tests such as BERT, Throughput or RFC25544 must
be used to test the link and payload.
ODUflex allows flexible selection of multiple ODU0s, contiguous or non-contiguous, within an OTU2 interface, to
achieve the desired (or closer) Nx1.25 Gbps rate required for the payload. Tap on the Tx and Rx tributary slot
blocks to select the channels and data rate. N = 1 to 8.
Tx/Rx Test Rate (ODUflex Ethernet only):
Tap on the numbered blocks representing tributary slots to select a test rate
Tx and Rx ODUk Channels:
Depending on the physical interface (OTU2 or OTU1), the test payload rate and the
multiplexing structure, the test set offers these fields to generate and identify the test payload position, within the OTN
signal.
ODU0 GE, ODU1->0 PRBS, ODU1->0 GE:
Tx/Rx ODU0 Channel
Scrambler:
Turns the standard scrambler function ON and OFF. It is recommended to leave it ON.
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