Hi S Shankar-- If you want to predict an accurate BER at these levels it is recommended that you simulate using the worst-case bit stream specific to a channel. That bit sequence will vary based on the characteristics of the channel, and of course should include the appropriate encoding (like 8b10b). If you are interested in learning more, check out the following IBIS Summit presentation from Arpad Muranyi and Vladimir Dmitriev-Zdorov from Mentor Graphics: http://www.eda.org/ibis/summits/jun10/muranyi2.pdf --Pat -----Original Message----- From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On Behalf Of shankar san Sent: Monday, February 17, 2014 10:28 PM To: si-list@xxxxxxxxxxxxx Subject: [SI-LIST] PRBS Pattern Vs BER Hi, Could some one guide me what should be the PRBS pattern for achieving BER < 1e-16 ? Also how to calculate the required no. of bits for the PRBS pattern as per the require BER? Thank You S Shankar ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field or to administer your membership from a web page, go to: //www.freelists.org/webpage/si-list For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List forum is accessible at: http://tech.groups.yahoo.com/group/si-list List archives are viewable at: //www.freelists.org/archives/si-list Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field or to administer your membership from a web page, go to: //www.freelists.org/webpage/si-list For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List forum is accessible at: http://tech.groups.yahoo.com/group/si-list List archives are viewable at: //www.freelists.org/archives/si-list Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu