Ben 4U 17-port rack. Rack height is 4U, you can insert 17 interface conversion cards, or 1 network administrator card, 16 function cards each block work independently, different types of interface conversion cards can be inserted into the same rack and work at the same time. Rack height is 4U, you can insert 17 interface conversion cards, or 1 network administrator card, 16 function cards each block work independently, different types of interface conversion cards can be inserted into the same rack and work at the same time. Lɔ̈ɔ̈m de teknoloji de communication isolation bɛ̈n ya tɛ̈n yenë riɛl de sistem ya tɛ̈n yenë kaar de interface ya tɛ̈n yenë kaar de interface ya tɛ̈n yenë kaar de interface ya tɛ̈n yenë kaar