Definition

plesiochronous

Contributor(s): Roberto Neijts

Plesiochronous (pronounced plee-see-AH-krun-us, from Greek plesos, meaning close, and chronos, meaning time) is an adjective that describes operations that are almost, but not quite, in synchronization - in other words, almost synchronous. The term is used in the Plesiochronous Digital Hierarchy (PDH), the widely-used system in which the transmissions from one continent (such as North America) are internetworked with transmissions in other continents (such as Europe) by making small adjustments in the differing data rates between the systems.

A plesiochronous system could arise as the result of two systems having slightly different clock readings over time. In such a system, one of the systems or a third system would need to notice the mismatch and make some compensating adjustment, such as repeating or deleting a data packet or frame.

Plesiochronous can be compared with asynchronous, isochronous, and synchronous.

This was last updated in September 2005

Continue Reading About plesiochronous

Dig Deeper on Telecommunication networking

Start the conversation

Send me notifications when other members comment.

Please create a username to comment.

-ADS BY GOOGLE

File Extensions and File Formats

Powered by:

SearchUnifiedCommunications

SearchMobileComputing

SearchDataCenter

SearchITChannel

Close