W7500P & CISCO SF110d switch problem.


Hi! We was developed Ethernet to UART converter based on W7500P chip. It work fine, but we have problem, when connect his via CISCO SF110d(or similar) switch to LAN. We have very long ping, when connected our converter to LAN via CISCO switch( 300ms and more) and this do not download java scripts and pictures for configuration menu(via WEB interface). When we make connect converter to LAN via another switch or directly to PC(notebook), then we have not problem. Pleas, suggest resolution this issue.
PS. we have W7500P R3 revision(1824) code.