A backbone star topology shall have no more than______ level(s) of cross-connections.

One level of cross-connection is more restrictive than the standard requires and would prevent the use of an intermediate cross-connect, limiting scalability in large installations.

ANSI/TIA-568 specifies that a backbone star topology shall have no more than two levels of cross-connections - one between the main cross-connect (MC) and the intermediate cross-connect (IC), and one between the IC and the horizontal cross-connect (HC). Capping the hierarchy at two levels limits cumulative signal loss and insertion delay, keeping the end-to-end link within the standard's supported performance parameters for structured cabling.

Three levels of cross-connections exceed the ANSI/TIA-568 maximum of two, introducing additional attenuation and latency that push links outside compliant performance limits.

Four levels of cross-connections are not permitted by the standard; each additional cross-connection adds signal loss that accumulates beyond acceptable thresholds.

Five levels of cross-connections are prohibited by the standard and would result in severe signal degradation that renders the cabling plant non-compliant and unreliable.