Cell Relay Archive[Date Prev][Date Next][Thread Prev][Thread Next] [Date Index][Thread Index][Author Index][Subject Index] Re: ATM cell scrambling
In article <86hsvf$j1c$1@nnrp1.deja.com>, sripriyar@my-deja.com wrote: > Hello Everybody, > What is the practical application of cell scrambling on links below DS3 > speeds? (I.432 does not define the application of ATM over these > physical interfaces whereas it does for SONET and DS3.) Do DSL, T1 and > E1 links require that this scrambling be applied? > > How extensively is ATM cell scrambling used in the real world? ATM and SONET each uses scrambling rather than other methods (such as 4B/5B or Manchester encoding) to minimize DC bias. Which means that ATM over SONET scrambles twice. Using scrambling, you avoid having a clock rate that is faster than the bit rate. One symbol over the wire is one bit of information. So there is no issue with link speed. I expect that when we do send ATM cells over DSL, the bits will be scrambled over DSL, as they are over other media. Maybe someone has a different view? -- Bert albert.e.manfredi@boeing.com Sent via Deja.com http://www.deja.com/ Before you buy.
|
|