Application Guide

[160]
Software User's
Manual
–
Version 3.0
Test Signal
Setting Description
Enable Test Signal based on transmitting TST PDU can be enabled/disabled.
DEI The DEI to be inserted as PCP bits in TAG (if any).
Priority The priority to be inserted as PCP bits in TAG (if any).
Peer MEP
The TST frame destination MAC will be taken from the 'Unicast Peer MAC'
configuration of this peer.
Rate
The TST frame transmission bit rate - in Megabits per second. Limit is 400 Mbps.
This is the bit rate of a standard frame without any encapsulation. If 1 Mbps rate is
selected in a
n
EVC MEP, the added tag will give a higher bitrate on the wire.
Size
The TST frame size. This is entered as the wanted size (in bytes) of an untagged
frame containing TST OAM PDU - including CRC (four bytes).
Example when 'Size' = 64=> Untagged frame size = DMAC(6) + SMAC(6) +
TYPE(2) + TST PDU LENGTH(46) + CRC(4) = 64 bytes
The transmitted frame will be four bytes longer for each tag added - 8 bytes in case
of a tunnel EVC.
There are two frame MAX sizes to consider:
 Switch RX frame MAX size: The MAX frame size (all inclusive) accepted
on the switch port of 9600 Bytes
 CPU RX frame MAX size: The MAX frame size (all inclusive) possible to
copy to CPU of 1526 Bytes
Consider that the Peer MEP must be able to handle the selected frame size.
Consider that in order to calculate the 'RX rate' a received TST PDU must be
copied to CPU.
Warning will be given if selected frame size exceeds the CPU RX frame MAX size.
Frame MIN
s
ize is 64 Bytes.
Pattern
The 'empty' TST PDU has the size of 12 bytes. In order to achieve the configured
frame size, a data TLV will be added with a pattern.
Example when 'Size' = 64=> Untagged frame size = DMAC(6) + SMAC(6) +
TYPE(2) + TST PDU LENGTH(46) + CRC(4) = 64 bytes
The TST PDU needs to be 46 bytes so a pattern of 46-12=34 bytes will be added.
All Zero: Pattern will be '00000000'
All One: Pattern will be '11111111'
10101010:
Pattern will be '10101010'