Talk:Plesiochronous Digital Hierarchy
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[edit] Unsorted text
whatis E1,E2
E1= 2Mbits port
- E1 and E2 are names for transport streams E1 having a bandwidth of 2.048Mbps and E2 of 8.448Mbps—Preceding unsigned comment added by 80.169.174.71 (talk • contribs)
In "This is done by taking 1 bit from stream #1, followed by 1 bit from stream #2, ..." is it really 1 bit, not 8? —Preceding unsigned comment added by 82.6.99.8 (talk) 11:00, 13 March 2008 (UTC)
- This is PDH - it uses bit interleaving. So 1 bit at a time, not 8. —Preceding unsigned comment added by 84.233.160.78 (talk) 11:45, 5 January 2010 (UTC)
[edit] Arithmetic
Pardon my ignorance of computer science. This is in the article:
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- Similar techniques are used to combine four × 8 Mbit/s together, giving 34 Mbit/s. Four × 34 Mbit/s, gives 140. Four × 140 gives 565.
Is this some system of arithmetic differing from that which most of us know? Michael Hardy (talk) 17:18, 8 February 2009 (UTC)
There is a slight amount of overhead ("stuffing") added to each level of the hierarchy to allow for differences in the timing of different tributary inputs. This makes the bitrate slightly higher than the combined total of the multiplexed streams. —Preceding unsigned comment added by 84.233.160.78 (talk) 10:40, 4 March 2009 (UTC)
[edit] WHATS THE DIF-- PDH AND SDH
i want support you my question is what is the different between PDH AND SDH
REGARDS RAJU THAKUR —Preceding unsigned comment added by 123.252.210.114 (talk) 07:21, 4 August 2009 (UTC)
The difference is, they are completely different technologies! The most basic difference is that PDH is plesiochronous, that is, "almost synchronous", whereas SDH is synchronous. But this is just the tip of the iceberg. This is not a question that can be answered simply; you need to do some research... —Preceding unsigned comment added by 84.233.160.78 (talk) 09:24, 7 August 2009 (UTC)
