Smart Jack to Opt 81C (RJ-45 to DB15) Pinout

[Watsonj]

It's amazing that after 7 years of working in Telecom, I keep discovering how little I really know...

In this case, I am adding 4 new PRIs to an Opt 81C. The database is programmed (the "hard" part) but I had issues with the circuits coming up. I wasn't able to get the LEC on the phone during my maintenance window but I think my cabling was wrong (the "easy" part). I am running directly out of the smart jack (RJ45) and straight to the back of the switch (DB15F) - no CSU present. I am using a standard 568B CAT 5 cable with an RJ45 to DB15F adapter.

Is this the correct configuration for the pinout:

RJ45 DB15
------------
1 1
2 3
4 9
5 11


Now, If I add a CSU to the mix, my config will be a 568B CAT 5 to the NET port of the CSU and out of the CPE port with another 568B CAT 5 to a RJ45 to DB15F adapter - Would the adapter need to be the following config for this scenario:

RJ45 DB15
------------
1 1
2 9
4 3
5 11


Final question... We used to always use special T1 cabling - the heavy, shielded cable that was almost impossible to crimp. Does CAT 5 really provide a comparable alternative? What is the real world max for cable lengths?

 

[EddieDuece]

Check out thread 798-1366402. That will get you where you need to be. And the Cat5 works just as well as the shielded.

 

[GMgerry]

I had to do a temporary fix for a PRI that got distroyed by a demo crew. I ran a short piece of cat 5e to the smart jack than split the pairs to go into a 96 port voice patch panel for about 300 feet and than back to one connector and into the CSU. Has been work fine for the past three weeks.

"We don't need no stinkin sheilded cable

 

[TAnselm]

CAT 5 max length is 1000 meters. about 3000 feet.