Falcon
M-Class
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331
4.22.7.3
Ethernet Test Signal
This function is used to perform one-way demand diagnostics tests.
Thus it is possible to verify bandwidth throughput, frame loss, bit errors, etc.
When configured to implement such tests, a MEP inserts suitable frames with ETH Test information
with specified throughput, frame size and transmission patters.
A test signal generator associated with a MEP can transmit TST frames according to the Parameters
configuration as depicted in the next Test Signal display and Parameters TST table
When a MEP receives TST frames, it examines them to ensure that the MEG Level corresponds to
its own configured Level. If the receiving MEP is configured for ETH-TST function, the test signal
detector associated with the MEP detects bit errors from the pseudo-random bit sequence of the
received TST frames and reports such errors.
Figure 4-192: Test Signal display
Table 4-170
:
Test Signal Parameters
Test Signal
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 Mega bits 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 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 a
un-tagged frame containing TST OAM PDU - including CRC (four bytes).
Example when 'Size' = 64 => Un-tagged 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
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