Hi Hassan: For those active cables, where the equalizer usually sitting? In the middle of the cable, or in the both ends of the cable? Regards,Han --- On Mon, 7/20/09, Hassan O. Ali <hassan@xxxxxxxx> wrote: From: Hassan O. Ali <hassan@xxxxxxxx> Subject: [SI-LIST] Re: High speed serial links over copper cables To: si-list@xxxxxxxxxxxxx, jhasson@xxxxxxxxxxxxxxxxxxx Date: Monday, July 20, 2009, 3:23 PM BODY { font-family:Arial, Helvetica, sans-serif;font-size:12px; } JF, Three points: 1. You can find several twinaxial cable offerings that are lighter than Belden 1694A coaxial cable and have them operate at 2.5Gbps differentially over a 10m length. Some popular bulk twinaxial cable makers: Amphenol Spectra-Strip, WL Gore, Madison Cable, and Leoni. For some standard connectors, you can also obtain cable assemblies from such companies as Amphenol, Molex, Tyco Electronics, WL Gore, and Leoni. 2. Most off-the-shelf PHYs designed to operate serial links differentially e.g. for XAUI, can also work in single-ended format e.g. using only the positive terminal and terminating the negative terminal with a 50-ohm load. The PHYs do not have to be designed for SMPTE. 3. If the PHY of your interest cannot support the 10-meter cable length, you can use several off-the-shelf cable equalizers on your board or use active (equalized) cables. If you need more info on the above, please contact me directly. Best regards. Hassan. On Mon 07/20/09 2:05 AM , jhasson@xxxxxxxxxxxxxxxxxxx sent: Hi, I have been looking at the possibility of setting up a high speed (about 2.5Gbit/s) serial link over a 10 m copper cable. In order to reduce weight and number of cables, a focus was given to single ended options. The standard that comes up is SMPTE424M running at up to 2.97Gbit/s over a long (much more than 10 m) 1694A belden coaxial cable. I would like to be able to use the physical layer but not to transmit video. Is there a drawback in using chips for SPMTE424M while for instance using the 8B/10B encoding instead of SMPTE scrambling ? I would not encounter the pathological data (the standard DC blocking capacitor could be reconsidered) then but are there any tricks to consider that would impact the link ? As a more general question, how come only video field seems to have developped high speed single ended video transmission ? Best regards, JF ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx [1] with 'unsubscribe' in the Subject field or to administer your membership from a web page, go to: //www.freelists.org/webpage/si-list [2] For help: si-list-request@xxxxxxxxxxxxx [3] with 'help' in the Subject field List technical documents are available at: http://www.si-list.net [4] List archives are viewable at: //www.freelists.org/archives/si-list [5] or at our remote archives: http://groups.yahoo.com/group/si-list/messages [6] Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu [7] Links: ------ [1] http://webmail.magma.ca/javascript:top.opencompose(\'si-list-request@xxxxxxxxxxxxx\',\'\',\'\',\'\') [2] http://webmail.magma.ca/parse.php?redirect=http%3A%2F%2Fwww.freelists.org%2Fwebpage%2Fsi-list [3] http://webmail.magma.ca/javascript:top.opencompose(\'si-list-request@xxxxxxxxxxxxx\',\'\',\'\',\'\') [4] http://webmail.magma.ca/parse.php?redirect=http%3A%2F%2Fwww.si-list.net [5] http://webmail.magma.ca/parse.php?redirect=http%3A%2F%2Fwww.freelists.org%2Farchives%2Fsi-list [6] http://webmail.magma.ca/parse.php?redirect=http%3A%2F%2Fgroups.yahoo.com%2Fgroup%2Fsi-list%2Fmessages [7] http://webmail.magma.ca/parse.php?redirect=http%3A%2F%2Fwww.qsl.net%2Fwb6tpu ------------------------------------------------------------------ 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 technical documents are available at: http://www.si-list.net List archives are viewable at: //www.freelists.org/archives/si-list or at our remote archives: http://groups.yahoo.com/group/si-list/messages 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 technical documents are available at: http://www.si-list.net List archives are viewable at: //www.freelists.org/archives/si-list or at our remote archives: http://groups.yahoo.com/group/si-list/messages Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu