Re: (ASCEND) MAX 4002 won't link to PRI

["Peter Copeland" <Tharen@i-t-c.com>]

Scott:

Thnaks for all the info. I'll need to digest it over the weekend.
You're right about how much conflicting information there
is out there. At any rate, since either loop wiring scenario
resulted in a solid RA I'm shipping the MAX back for a warranty
RMA. We'll see..

At 06:38 PM 4/18/2000 -0400, you wrote:
>Hi Peter,
>
>I had to test couple of P130's recently, in loopback and back to back with no
>telco circuit at all before the telco did some more extensive testing and
>found a problem at their CO.
>
>Initially I got this from Ascend/Lucent tech support.
>
>For a T1 loopback take an ethernet cable and cut in two, strip the 1,2,4,5 and
>
>twist the 1 and 5 together, and  then twist the 2 and 4 together. Plug this in
>
>and you should get the carrier indication and see packets transmitted and
>received. Of course the connection will then terminate pretty quicky when the
>unit tries to authenticate, but at that point you've been able to see it send
>and receive packets which gives basic verification the CSU is functioning.
>
>T1 crossover for back to back configuration - pin 1,2,4,5 on one end - to
>5,4,2,1 on
>the other (When I say pin 1, it's the first pin on the left side with the tab
>on the RJ45 plug
>facing down and holding it as though you were about to plug it in.)
>
>Both these worked for me and the fact that the link came up and authenticated
>seems to verify the correct wiring configuration.(At least with Ascend gear) I
>hooked up a hub and notebook to test login, data transfer etc.
>
>here's a diagram that agrees with the above..
>http://www.adtran.com/support/technotes/t1ddsadptxvr/
>
>I've also seen the other 1to4 & 2to5 T1 in several places including some that
>could not work because closer inspection of the diagram shows RX to RX and TX
>to TX. It's amazing the amount of wrong information out there. I have a wiring
>chart from Leviton that gets ethernet wrong.
>
>The 1to4 and 2to5 is USOC RJ48C, this is also the specification given in the
>Ascend P130 manual for a crossover cable. - Qualified with the statement.
>(Model #RJ48C-X) (Part #2510-0059-001) when the WAN transmits on pin 5&4 and
>receives on pins 2&1
>
>(Model #RJ48C-S) (Part #2510-0064-001) when the WAN transmits on pins 2&1 and
>receives on pins 5&4
>
>below is an example of one I see a lot - notice how the description doesn't
>match the drawing.
>http://www.arcelect.com/RJ48C_and_RJ48S_8_position_jack_.htm
>
>another that seems strange - straight thru
>http://www.icn.state.ia.us/services/techhelp/T1_Cable.htm
>
>one that agrees with 1to4 and 2to5
>http://www.livingston.com/tech/docs/hwpm3/CableSpecs2.fm.html
>
>Any waay - all I know is the first ones above worked - they disagree with
>whats in the Ascned manual but it's what I got from Ascend tech support and I
>know it works. And it agrees with the Adtran site. I'm beginning to think it
>will work either way and will test it out soon.
>
>Regards,
>
>Scott Starbuck
>Aobe Network Group
>5340 Millertown Pike, Suite 131
>Knoxville, TN 37924
>Phone: 865-689-7290
>Fax: 865-688-0068
>---------------------
>
>Peter Copeland wrote:
>
>> I just checked my book - you're right about the pinout. Ascend was wrong.
>> However, even with the cable set 1 to 4 and 2 to 5,
>> the display still shows Red Alarm, so I'll still return it as
>> an RMA.
>>
>> At 03:17 PM 4/17/2000 -0700, you wrote:
>> >Did you make the loopback cable going from pin 1 to pin 4 and pin 2 to
>> >pin 5?  If so, then you might be right that it's a bad CSU.
>> >
>> >
>> >When I made a loopback cable and hooked it to the WAN1 port, I got a
>> >solid
>> >Red Alarm - as opposed to RA/YA/S1 back and forth every few seconds
>> >which
>> >is what it was doing when hooked to the telco. It should have been
>> >showing that it
>> >was in loopback mode. Ascend said this is a bad CSU, so it's off as an
>> >RMA now.
>> >
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>>
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