E1 Cabling for VWIC2-2MFT-T1/E1
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From: Bod43 on 23 Apr 2008 04:43 On 23 Apr, 10:01, "James.Brown" <j.a.m....(a)btinternet.com> wrote: > On 22 Apr, 17:52, Bo...(a)hotmail.co.uk wrote: > > > > > > > On 22 Apr, 16:14, Doug McIntyre <mer...(a)geeks.org> wrote: > > > > "James.Brown" <j.a.m....(a)btinternet.com> writes: > > > >Could anyone tell me whether the following are three valid > > > >alternatives for E1 cabling please? > > > >Option 1 - RJ48C: > > > >1 to 7 > > > >2 to 8 > > > >4 to 2 > > > >5 to 3 > > > >http://www.arcelect.com/Rj-48c.gif > > > > I don't think you are looking at this document correctly. This wiring > > > as you specify makes no sense. The picture does make sense, but only > > > inso much as a telco installer would be doing it. > > > > >Option 2 - T1/E1 Crossover: > > > >1 to 4 > > > >2 to 5 > > > >3 to 3 (Not Used) > > > >4 to 1 > > > >5 to 2 > > > >3 to 3 (Not Used) > > > >6 to 6 (Not Used) > > > >8 to 8 (Not Used) > > > >http://www.corelatus.com/gth/faq/img7.png > > > > Yes, this would a be T1/E1 cross-over.. Used to hookup two devices > > > back-to-back. > > > > >Option 3 - Straight-Through > > > > Probably what you should be using? > > > All of the, relatively few, 1's that I have had anything to > > do with have used a Straight through cable to connect > > the end equipment - a cisco router. > > Same with PRI flavour E1s and I think T1's too > > although the latter have been a bit far away for me to > > inspect the cable personally. > > > I am in the UK.- Hide quoted text - > > > - Show quoted text - > > Thanks All. This particular E1 PRI is in Italy and we're having > problems with the straight-through, hence the need for me to make up > an alternative and send it out by post. > > Doug - if I'm interpreting the diagram of the RJ48C incorrectly, could > you explain what the pinouts illustrated are please (apologies, but > I'm fairly new to Networking/cabling). > > Regards > > James.- Hide quoted text - > http://www.cisco.com/univercd/cc/td/doc/product/access/acs_serv/5300/hw_inst/cha_inst/53ccblv2.pdf Lists the pinouts of some Cisco cables that may be of relevance. RJ-45-to-RJ-45 TE Cable Pinouts RJ-45-to-RJ-45 NT Cable Pinouts RJ-45-to-RJ-45 T1 Cable Pinouts However since it's a PRI I would be quite surprised if it did not require just a straight through. Far from sure though. I have put in a few and they have always been straight through to the router. PRI is very closely specified and it would be very surprising if there was a variation of this kind. I particularly like:- Table D-15 RJ-45-to-Bare Wire Inteface Cable Pinouts It really does say - The pin one wire is connected to pin one The pin two wire is connected to pin two ... Brightened up my day no end. http://www.vegaassist.com/download/docs/IN_25_E1_T1_connection_checklist_10.pdf Has a good description of the PRI pinouts.
From: Doug McIntyre on 23 Apr 2008 17:00
"James.Brown" <j.a.m.e.s(a)btinternet.com> writes: >>> >Could anyone tell me whether the following are three valid >>> >alternatives for E1 cabling please? >>> >Option 1 - RJ48C: >>> >1 to 7 >>> >2 to 8 >>> >4 to 2 >>> >5 to 3 >>> >http://www.arcelect.com/Rj-48c.gif >> >>> I don't think you are looking at this document correctly. This wiring >>> as you specify makes no sense. The picture does make sense, but only >>> inso much as a telco installer would be doing it. >Doug - if I'm interpreting the diagram of the RJ48C incorrectly, could >you explain what the pinouts illustrated are please (apologies, but >I'm fairly new to Networking/cabling). You seem to think the left side should be pins numbered from top down, 8, 7, 6, 5, 4, 3, 2, 1. But really, the wires are grouped by function, and not in any specific order as they would in an 8p8c jack. |