30
Noise settings can be configured on each channel independently.
To enable Noise Injection:
▪
Enable
noise insertion mode via the
button in the top configuration bar.
▪
Select
the desired type of Noise Injection.
Currently supported options are Random and Burst Noise.
▪
Configure
noise injection value in digital scale (0-1000).
▪
Apply
changes (on each channel independently).
To enable Shallow Loopback:
▪
Enable
function via the
button in the top configuration bar.
▪
Connect
an external traffic source to the RX port(s) of the BERT.
External traffic must be within the following range: 23-29 or 46-56 GBd.
▪
Inject
noise into the external traffic via the Noise Injection menu on each channel.
▪
Apply
intended noise injection on the looped-back external signal.
▪
Access
looped-back traffic via the TX ports.
The shallow loopback function works with a variety of traffic types including unframed PRBS,
framed ethernet and FEC traffic. The following figure depicts a ML4039EN accepting traffic from
an external 400G switch, looping the traffic back internally and re-transmitting it back to the RX
side of the host.
Figure 51: PAM4 eye diagram with and without noise injection applied
Figure
12
: About Window
Figure 52: Shallow loopback setup using ML4039EN and 400G switch
Figure
13
: About Window
NOTES:
NOTES:
