Note 1: The MDF is used to cross-connect any outside line with any desired terminal of the multiple cabling or any other outside line.
Note 2: The MDF usually holds central office protective devices and functions as a test point[?] between a line and the office.
Note 3: The MDF in a private exchange[?] performs functions similar to those performed by the MDF in a central office. Synonym (in telephony) main frame[?].
Source: from Federal Standard 1037C and from MIL-STD-188
In general, if -∞ <= s < t <= ∞, then
M(s) <= M(t)
and the two means are equal if and only if a1 = a2 = ... = an. Furthermore, if ...
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