Pin 1 to Pin 4
Pin 2 to Pin 5
Pin 4 to Pin 1
Pin 5 to Pin 2
It's the same as a T1 crossover cable. IIRC, the E1/T1 sends signal out on pair 4/5 and receives on 1/2. So, crossing the pairs should be correct. Some Cisco docs also described the same thing (for connecting their voice routers to your PBX).
Regarding the grounding or so called shielding, I was told it has to be properly done according to telco specs. In fact, some E1 vendors will explicitly state that you should get someone qualified to make the cable if it involves the grounding.
So far, I've been running fine without the grounding. I think it's ok if the distance is short, but if the distance is far I think you're better off with proper grounding. It would be helpful if someone can help clarify this. My gut feel: it's probably very important if you've ever seen the thickness of ground cables used in the COs.
Cheers.
Carlos Carús wrote:
Jared Smith escribió:
I have a funny feeling your crossover cable might be wrong... I'm not sure about an E1 crossover, but I know that a T1 crossover is different than a standard ethernet crossover. (See http://www.jaredsmith.net/misc/cables/) If you do find the pinout for an E1 crossover, let me know and I'll add it to my site.
Jared Smith
Right now I'm testing this pinout: pin1 (Rx -) <--> pin4 pin2 (Rx +) <--> pin5 pin3 (Rx Shield) <--> pin3 pin4 (Tx -) <--> pin1 pin5 (Tx +) <--> pin2 pin6 (Tx Shield) <--> pin6 pin7 (not used) <--> pin7 pin8 (not used) <--> pin8
I don't know if this one is the good one, but zttool says it's ok. I'm not sure, but E1 and T1 cables should be the same...
Best Regards,
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