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Just what i have been trying to tell you, since sometime in the 1960's POTS lines are converted to DS-0 using 56 k-samples/second CVSD's. The oversampling moves the noise "out of band" big time and the analog filters are much easier to implement.
-- JosephKK Gegen dummheit kampfen die Gotter Selbst, vergebens. --Schiller
You don't know what you are talking about. Do some homework.
Don
joseph2k wrote in sci.electronics.design:
That's rather imprecise.
Schiller's original words: "Mit der Dummheit kämpfen Götter selbst vergebens" (Die Jungfrau von Orleans, III, 6). These days it is commonly rendered as "Gegen Dummheit ...". In ASCII, use "ae" for "ä" and "oe" for "ö".
Anno
The stolen bits are at the DS0 level; not the DS1. And they happen with "CT1" aka 24 B channels on a DS1. It's a carryover from E&M signalling, itself invented about the time of that squabble with the Spanish Armada.
Now, PRI is more common than CT1; it has twenty three 64Kbps B channels and a separate 64Kbps D (signalling) channel.
-- A host is a host from coast to coast.................wb8foz@nrk.com & no one will talk to a host that's close........[v].(301) 56-LINUX Unless the host (that isn't close).........................pob 1433 is busy, hung or dead....................................20915-1433
I believe you are speaking of the ESF data link. In the public telephone network, it is not used for "overhead channel signaling." It is used for continuously transmitting performance report messages, when activated.
PRI (23B + D) is *not* at all common except, perhaps, in private networks.
The POTS network has been transitioning from robbed bit signaling to Common Channel Inter-office Signaling, CCIS for many years. Last I heard, Signaling System 7 handled the CCIS functions, CCIS uses *none* of the bits of the channels nor their parent DS1. In fact, bandwidth for a call is not assigned until CCIS has determined that the call has a high degree of potential for completion.
Don
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