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The other end of a cable ends at the desk. The cable management needs at either end are different (see also: Structured cabling ) . Buildings and office furniture are often designed with cable management in mind; for instance, desks sometimes have holes to pass cables, and dropped ceilings , raised floors and in-floor cellular raceway systems ...
The delay skew test is used to find the difference in propagation delay between the fastest and slowest set of wire pairs. An ideal skew is between 25 and 50 nanoseconds over a 100-meter cable. The lower this skew the better; less than 25 ns is excellent, but 45 to 50 ns is marginal.
Each outlet is then patched into a network switch (normally also rack-mounted) for network use or into an IP or PBX (private branch exchange) telephone system patch panel. Lines patched as data ports into a network switch require simple straight-through patch cables at each end to connect a computer.
Smaller cables may be laid unsecured in horizontal trays, or secured with cable ties to the bottom of vertically mounted trays. [4] To maintain support of cables at changes of elevation or direction of a tray, a large number of specialized cable tray fittings are made compatible with each style and manufacturer.
An intermediate distribution frame (IDF) is a distribution frame in a central office or customer premises, which cross connects the user cable media to individual user line circuits and may serve as a distribution point for multipair cables from the main distribution frame (MDF) or combined distribution frame (CDF) to individual cables connected to equipment in areas remote from these frames.
However, switching equipment that can emulate the capabilities of a given patch bay is much more expensive. For example, an S-Video matrix routing switcher with the same capability (8×8) as a 16-point S-Video patch panel (8 patch cables connects 8 inputs and 8 outputs) may cost ten times more, though it would probably have more capabilities.