Most basic examples of recursion, and most of the examples presented here, demonstrate direct recursion, in which a function calls itself. Indirect recursion occurs when a function is called not by itself but by another function that it called (either directly or indirectly). For example, if f calls f, that is direct recursion, but if f calls g which calls f, then that is indirect recursion of f. Chains of three or more functions are possible; for example, function 1 calls function 2, function 2 calls function 3, and function 3 calls function 1 again.
Indirect recursion is also called mutual recursion, which is a more symmetric term, though this is simply a difference of emphasis, not a different notion. That is, if f calls g and then g calls f, which in turn calls g again, from the point of view of f alone, f is indirectly recursing, while from the point of view of g alone, it is indirectly recursing, while from the point of view of both, f and g are mutually recursing on each other. Similarly a set of three or more functions that call each other can be called a set of mutually recursive functions.
This type of interference in networking is called cross-talk signal disruption. It may also be referred to as degradations caused by electrical sources or electromagnetic sources.
<h3>How does Crosstalk Occur?</h3>
Whenever signals traveling along a networking cable interferes with another it leads to electromagnetic disruptions in those signals. This is referred to as Crosstalk.
This can happen within a pair of cabling that is twisted. This can be corrected by:
using shielded networking cables and
by keeping the cable further apart.
Please see the link below for more about Networking: