Operation Manual

82
Advanced
Parameters
 TOS: This parameter allows the configuration of the Type-Of-Service (TOS) byte in the
IP header (also known as the Differentiated Services – DS – field). Valid values are
between 0 and 255. Configuring this is only useful if the downstream router is
configured to honor the field.
 TTL: This parameter allows the configuration of the Time-To-Live (TTL) byte in the IP
header. Valid values are between 0 and 255. If not explicitly configured, it defaults to
128. This field controls how many hops the packet can traverse before it is dropped by a
router. The default value of 128 is suitable for virtually all applications.
 DF Bit: This parameter allows the configuration of the Do-not-Fragment (DF) bit in the
IP header. The B264 will never produce fragmented packets, and with the UDP payload
set to 7 transport packets, the IP packets are guaranteed to fit inside the Ethernet MTU.
This control is provided for compatibility with legacy switches/routers. Some legacy
equipment may exhibit performance problems if this bit is not set. This is not an issue
with current network equipment.
SMPTE 2022 FEC Support
The B264 supports one FEC session per Ethernet port. A checkbox for SMPTE 2022 FEC will
be displayed if the feature is available. Once this feature is enabled for one of the streams in a
given Ethernet port, the checkbox will no longer be displayed.
Once the SMPTE 2022 FEC box is checked, additional parameters become available for
configuration: