PRI Pinout

[g18c]

Hi guys, until now I have very simply hooked up from ISP ONT to IPO PRI E1 with the following:

http://www.arcelect.com/T1_cross-Over_cable_and_loop-back.jpg

In a few days will need to hookup instead to a Keymile Line Runner SHDSL-2 DT which has a 15 pin D connector:

https://www.chebucto.ns.ca/Chebucto/Technical/Manuals/Max/max6000/gs/cablesa5.gif

Just for sanity checking, would I go from:

D-15        RJ45
3           1
11          2
1           4
9           5

Sorry for silly question cant find if Tx+ or Tx- on the 15 pin diagram.

 

[pmcook]

1-2 are receive and 4-5 are transmit on the RJ45. 1-9 are trans on the d-sub.

 

[g18c]

Does it matter it is Tx+ and Tx- are the wrong way round?

 

[pmcook]

Yes, polarity matters.

 

[g18c]

We would normally wire up the PRI terminal with a crossover RJ-48 cable (quite useful

http://www.ip-sa.pl/doc/ras/max800-6000/m6hwinst/cables.htm)...

everywhere I look agrees on RJ48 to RJ48 no issues there. For RJ48 to D-15:

So would be (I think):

  D-15             RJ48
 1 (Tx-)    <->    1 (Rx-)
 9 (Tx+)    <->    2 (Rx+)
11 (Rx-)    <->    4 (Tx-)
 3 (Rx+)    <->    5 (Tx+)

But then this gives a following pintout:

https://supportforums.cisco.com/document/34981/various-pin-outs-used-pots-connections?db=5

seems to be different:

T1/E1 crossover (for PRI and CAS back-to-back connection):  

RJ-48 ----- D-15
   1  -----   1
   2  -----   9
   4  -----   3
   5  -----  11

Yet this says something different again:

http://www.juniper.net/techpubs/hardware/m-series/m40/m40-hwguide/html/pinout4.html

and

http://www.juniper.net/documentatio...ce/specifications/pic-m120-e1-t1-pinouts.html

  RJ-48 Connector to DB-15 Connector (Crossover) Pinout:

  D-15             RJ48
 9 (Tx-)    <->    1 (Rx-)
 1 (Tx+)    <->    2 (Rx+)
11 (Rx-)    <->    4 (Tx-)
 3 (Rx+)    <->    5 (Tx+)

Apologies but the more I look the more I get confused, the parity of different sites seems to be different... guidance on which is the correct above would be much appreciated.

 

[pmcook]

Always keep your polarity matched. You will be fine. For example if you were going RJ45 to RJ45 it would be 1-1, 2-2, 4-4, 5-5. For a crossover you would go 1-4, 2-5, 4-1, 5-2. DO you have a breakout box? If you will be making your own cable, use crimp pins rather than solder well so you can experiment. But the rule is polarity matches. You can always just buy a pre=made cable from say Black Box.

http://www.blackbox.com/Store/Detai...J-48C-Crossed-Pinning-5-ft-1-5-m/ETNMR03Ă0005