Referring to my thread here
I am looking to make DB15 to DB15 crossover cable to simulate ISDN E1 PRI.
I found these two resources :
Which one should I follow if I would like to make this type of cable ?
Solved! Go to Solution.
The cable is easy: each end of the connector is one pair, with the pins being the top-most and bottom-most pins on either side (pins 1&9 and pins 8&15 ... crossover 1->8, 9->15).
The problem is that a back-to-back PRI won't work. For ISDN, you need an intermediate switch (or device that looks like an ISDN switch).
You could probably do it as a T1, but without the intermediate switch, you won't even get L1 connectivity ("Multi-Frame Established")
>>The cable is easy: each end of the connector is one pair, with the pins being the top-most and bottom-most pins on either side (pins 1&9 and pins 8&15 ... crossover 1->8, 9->15).
Could you please refer me where have you found this ? and Are you talking about DB15 to DB15 ? because in the link that I have posted :
is different to what you have mentioned
that is not correct. After you have made the cable as indicated, just configure as detailed at:
and PRI back-to-back will work without need for a switch.
could you please tell which one of those links that I have posted can be used to make a DB15 to DB15 cable, because I can see they have been using different pinouts assignments
What confusing me is : when I compared between the link from cisco
and the link below :
In the link from cisco (Table C-7: EI Interface Cable Pinouts) uses 6 (while other uses 4) pinouts :
Pin 8 --->1
Pin 15 --->9
Pin 7 --->2
Pin 2 --->11
Pin 10 --->4
While in the other link uses 4 pintouts
DB-15 ----- DB-15
1 ----- 3
3 ----- 1
9 ----- 11
11 ----- 9