I'm looking to connect a BMC 450 to an asterisk with a Digium Quad E1 card. Am I right in thinking that I'll need a special 'crossover-E1' RJ45 cable? If so, any clues where I might buy one in the UK? The Digium card sellers don't seem to stock such a thing. Thanks. Tim. Tim Panton - Web/VoIP consultant and implementor www.westhawk.co.uk
Hello, I think you must use a crossover cable. If I can't have a bought E1 crossover, I do it myself. Simply use a RJ45 cable and invert the 12 and 45. Regards, Sebastien AB2L +33 (0)367100783 sebastien at ab2l.eu Le 22/01/2011 13:49, Tim Panton a ?crit :> I'm looking to connect a BMC 450 to an asterisk with a Digium Quad E1 card. > > Am I right in thinking that I'll need a special 'crossover-E1' RJ45 cable? > > If so, any clues where I might buy one in the UK? The Digium card sellers don't seem to > stock such a thing. > > Thanks. > > Tim. > > Tim Panton - Web/VoIP consultant and implementor > www.westhawk.co.uk > > > > > -- > _____________________________________________________________________ > -- Bandwidth and Colocation Provided by http://www.api-digital.com -- > New to Asterisk? Join us for a live introductory webinar every Thurs: > http://www.asterisk.org/hello > > asterisk-users mailing list > To UNSUBSCRIBE or update options visit: > http://lists.digium.com/mailman/listinfo/asterisk-users >
Its easy to crimping one by your self. Just follow this diagram http://wiki.sangoma.com/Cablepinouts#t1_e1_cross On Sat, Jan 22, 2011 at 6:19 PM, Tim Panton <thp at westhawk.co.uk> wrote:> I'm looking to connect a BMC 450 to an asterisk with a Digium Quad E1 card. > > Am I right in thinking that I'll need a special 'crossover-E1' RJ45 cable? > > If so, any clues where I might buy one in the UK? The Digium card sellers > don't seem to > stock such a thing. > > Thanks. > > Tim. > > Tim Panton - Web/VoIP consultant and implementor > www.westhawk.co.uk > > > > > -- > _____________________________________________________________________ > -- Bandwidth and Colocation Provided by http://www.api-digital.com -- > New to Asterisk? Join us for a live introductory webinar every Thurs: > http://www.asterisk.org/hello > > asterisk-users mailing list > To UNSUBSCRIBE or update options visit: > http://lists.digium.com/mailman/listinfo/asterisk-users >-- Thanks & Regards, Godson Gera Asterisk FreeSWITCH Consultant <http://godson.in/> -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.digium.com/pipermail/asterisk-users/attachments/20110123/75aad8c6/attachment.htm>
On Saturday 22 Jan 2011, Tim Panton wrote:> I'm looking to connect a BMC 450 to an asterisk with a Digium Quad E1 card. > > Am I right in thinking that I'll need a special 'crossover-E1' RJ45 cable? > > If so, any clues where I might buy one in the UK? The Digium card sellers > don't seem to stock such a thing.It's easy to make an ISDN crossover cable. Cut one end of a standard network cable. Get a new RJ45 plug, rubber boot (not strictly necessary, but makes it look neater) and crimping tool. Push the rubber boot onto the end of the cable first. Strip about 2cm. of outer sheath and separate the inner pairs, then arrange in this order from left to right with the brass contacts uppermost: white/blue blue white/green orange white/orange green white/brown brown (i.e., wrap the "green" pair around the "orange" pair). Now trim the wires so there is just over 1cm. protruding from the outer sheath. Insert the wires into the new plug, crimp, and pull the rubber boot down over the plug. If you have an AVO, test for continuity as follows: pin 1 to pin 5, pin 2 to pin 4, pin 4 to pin 2, pin 5 to pin 1. (Pins 3, 6, 7 and 8 are not used in this configuration.) Finally, as this cable is a special one, BE SURE TO LABEL IT to prevent mistakes. For completeness' sake I ought to say, if you want or need to crimp the other end yourself, the wires should be arranged as follows: white/orange orange white/green blue white/blue green white/brown brown You did push the rubber boot on the end before you crimped the plug, didn't you? -- AJS Answers come *after* questions.
On Monday 24 Jan 2011, Tilghman Lesher wrote:> On Monday 24 January 2011 03:46:18 A J Stiles wrote: > > white/blue blue white/green orange white/orange green white/brown brown > > This is incorrect. The pairs should be: > > blue white/blue white/green white/orange orange green white/brown brown > > Wire 1 MUST swap with 4 and Wire 2 MUST swap with 5. To do as you have > shown above switches the polarity on each electrical circuit. It is > especially important that you do not switch the polarity, as some equipment > does not auto-correct for reversed polarity.I stand corrected -- though, the arrangement I described has definitely worked for me in the past (I'm looking right now at a homebrew crossover cable I replaced with a longer one when we installed a new server), so maybe our WCT410P is just more forgiving than some kit out there? Anyway, Tilghman is the expert, I'm just a satisfied user :) -- AJS Answers come *after* questions.