Plesiochronous Digital Hierarchy - Definition. Was ist Plesiochronous Digital Hierarchy
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Was (wer) ist Plesiochronous Digital Hierarchy - definition

TECHNOLOGY USED IN TELECOMMUNICATIONS NETWORKS
Independent clock; Independent clocks; Plesiochronous Digital Hierarchy

Plesiochronous Digital Hierarchy         
<communications> (PDH) A transmission system for voice communication using plesiochronous synchronisation. PDH is the conventional multiplexing technology for network transmission systems. The transmitter adds dummy information bits to allow multiple channels to be bit interleaved. The receiver discards these bits once the signals have been demultiplexed. PDH combines multiple 2 Mb/s (E1) channels in Europe and 1.544 Mb/s (DS1) channels in the US and Japan. PDH is being replaced by SONET and other SDH ({Synchronous Digital Hierarchy}) schemes. (2003-09-30)
Plesiochronous digital hierarchy         
The plesiochronous digital hierarchy (PDH) is a technology used in telecommunications networks to transport large quantities of data over digital transport equipment such as fibre optic and microwave radio systems. The term plesiochronous is derived from Greek plēsios, meaning near, and chronos, time, and refers to the fact that PDH networks run in a state where different parts of the network are nearly, but not quite perfectly, synchronized.
underling         
  • Career-oriented purposes can be diagrammed using a hierarchy describing how less important actions support a larger goal.
  • Maslow's hierarchy of human needs]]. This is an example of a hierarchy visualized with a triangle diagram.  The hierarchical aspect represented here is that needs at lower levels of the pyramid are considered more basic and must be fulfilled before higher ones are met.
  • tree]]. Diagrams like this exemplify [[organizational chart]]s.
  • sets]], the resulting ordering is a ''nested hierarchy''.
SYSTEM OF ELEMENTS WITH MULTIPLE LEVELS OR TIERS THAT ARE SUBORDINATED TO EACH OTHER
Containment hierarchy; Hierarchy member; Hierarchical relationship; Immediate subordinate; Immediate superior; Rooted hierarchy; Subordinate; Hierachy; Hierarchical; Hierarchichal; Heirarchy; Hierarchically; Hierarchies; Heirarchical; Hierarchism; Hierarchal structure; Hierarchical structure; Hiearchy; Heiarchy; Social hierarchies; Nested hierarchy; Hierarchie; Subordinates; Overlapping hierarchy; Branching hierarchy; Linear hierarchy; Flat hierarchy; Nested heirarchies; Position of authority; Hierachical; Underling; Hierarchic; Subsumptive containment hierarchy; Compositional containment hierarchy
(underlings)
You refer to someone as an underling when they are inferior in rank or status to someone else and take orders from them. You use this word to show that you do not respect someone.
...underlings who do the dirty work.
= minion
N-COUNT [disapproval]

Wikipedia

Plesiochronous digital hierarchy

The plesiochronous digital hierarchy (PDH) is a technology used in telecommunications networks to transport large quantities of data over digital transport equipment such as fibre optic and microwave radio systems. The term plesiochronous is derived from Greek plēsios, meaning near, and chronos, time, and refers to the fact that PDH networks run in a state where different parts of the network are nearly, but not quite perfectly, synchronized.

Backbone transport networks replaced PDH networks with synchronous digital hierarchy (SDH) or synchronous optical networking (SONET) equipment over the ten years ending around the turn of the millennium (2000), whose floating payloads relaxed the more stringent timing requirements of PDH network technology. The cost in North America was $4.5 billion in 1998 alone, p. 171.

PDH allows transmission of data streams that are nominally running at the same rate, but allowing some variation on the speed around a nominal rate. By analogy, any two watches are nominally running at the same rate, clocking up 60 seconds every minute. However, there is no link between watches to guarantee that they run at exactly the same rate, and it is highly likely that one is running slightly faster than the other.