[j-nsp] 4CHDS3 and M40, T1 interfaces won't come up

[Gary Tate]

On Jul 6, 2004, at 7:17 AM, James Sneeringer wrote:

> On Mon, Jul 05, 2004 at 04:34:57PM -0500, James Sneeringer wrote:
>> hardware: M40, P-4CHDS3
>> software: JunOS 4.4R3.4
>
> Problem possibly solved.
>
> This has been an ongoing problem, so our vendor shipped us a 
> replacement
> FPC and 4CHDS3 PIC, just in case it turned out to be a hardware 
> problem.
> We swapped out the FPC and PIC, with no change in behavior.  We then
> installed the old FPC and PIC in a different slot and moved the DS3 to
> the old PIC in the new slot, and T1 channels now come up.
>
> I'm left to ponder the following possible causes of the original 
> problem.
>
> 1) The system simply didn't like the 4CHDS3 card being positioned at 
> 4/3,
>    perhaps because it shared the FPC with other cards?  It also has a
>    4FE-Tx at 4/1 and a 4DS3 at 4/2.  This was how our vendor configured
>    it prior to shipping.
There is no restriction

> 2) There's some hardware problem with slot 4, such that whatever PIC is
>    in position 4/3 will have communication problems.
>
This is most likely.

> 3) Undiagnosed (or misdiagnosed) bug in our EOL'd version of JunOS.
>
Or a bug fixed now fixed in later releases.  I have searched and see 
nothing that could be related.

> 4) Sun spots?  Ghost in the machine?
>
> Coming from the Cisco world, I've grown accustomed to not being able to
> use certain combinations of cards in certain slots (e.g. "bandwith
> points" on the 7200VXR series).  Does the M40 have such a notion?
> Perhaps I just can't put a 4DS3 and a 4CHDS3 in the same slot?
>
There are no such restrictions.

> If anyone has any ideas on this, I'd be happy to hear them.  It appears
> to be functioning properly now, I just wish I knew why it wasn't 
> before.
>
> -James
>
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