List of terms 77
MDF
Main Distributing Frame. See “Frame” above.
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Multi-Frequency; A method of sending numerical address digits between
telephone company switching centers coded as two or more frequencies
between 300 and 3400 Hertz.
MFS
Multi-Frequency Signaling. Also means Multi-Frequency Sender.
MGS
Multi-Group Switch.
MSI
Mass Storage Interface.
MSL-1
Meridian SL- 1.
MSU
Mass Storage Unit.
Multiplex (MUX)
The process of combining two or more information channels into a single.
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transmission channel. (See “Frequency Division Multiplexing” and “Time
Division Multiplexing.
“)
Network equipment (NET)
A hardware subsystem that provides digital multiplexed switching for voice,
data, and signaling paths.
NFT values
The number of spares required for a field-replaceable item. NFT is
calculated by multiplying the number (N) of that item in use by the failure
rate (F) for the item from Appendix 1 by the turnaround time
(T)
in hours.
(N X F X T = NFT value.
)
See Appendix 1 for details.
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NTP
Northern Telecom Publication.
System overview 553-3001-l 00
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