The ASIU-E and the newer GPCU, are available in two versions; Ethernet Monitor which sends all 1553 messages to the Ethernet port and an Ethernet to 1553 BC/RT. These are configurations which have been supplied to customers.
Custom firmware can be supplied according to your specification.
The converters can be programmed to perform arithmetic and logical operations as well as bit/byte/word manipulations on the data as well as filtering.