[cisco-voip] back to back pri

[ash AD]

    Mohammad,
  
  I am guessing you are talking about on a router. If so, you  RJ-45s must be configured as a T1 crossover. Wiring pattern is as follows: 
  
  Side A      Side B
  Pin1   -      Pin4
  Pin2   -      Pin5
  Pin3   -      Pin3
  Pin4   -      Pin1
  Pin5   -      Pin2
  Pin6   -      Pin6
  Pin7   -      Pin7
  Pin8   -      Pin8
  
  ...or typically side A: org/wt, org, grn/wt, blu, blu/wt, grn, brn/wt, brn
                      side B: blu, blu/wt, grn/wt, org/wt. org, grn, brn/wt, brn
  
  Make sure you adjust your cable length. If you are using CSUs, the crossover  will be placed between the CSUs on the "network" port. The port on  the CSU for router connection depends on the brand; usually labels D&I,  Terminal or AUX. The router to CSU cable would be straight-thru because the CSU  is DC. Once again, if using a CSU verify the terminal cable length on CSU  reflects your cable distance to prevent ruining T1 modules. I am guessing you  have the router side programming covered but, write back if you need further  assistance.
  
  - Peter
    

mohammad mirzaee <hezare3 at yahoo.com> wrote:  Hi;


Anybody knows how can I do back to back with isdn pri?



Regards
Mohammad

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