[asterisk-users] ISDN PRI configuration

[Vieri]

Interesting:
"If you cannot obtain T1 specific cable, then use two runs of CAT 5.  Use one CAT5 cable for the Transmit (Tx) signal and one CAT5 cable for the Receive (Rx) signal.  It is necessary for the Tx and Rx signals to be in separate sheaths to prevent cross talk interference"

So pins 1 and 2 on one cable and pins 4 and 5 on another.


--- On Thu, 12/8/11, Lyle Giese <lyle at lcrcomputer.net> wrote:

> Try this instead:
> 
> http://www.ahk.com/t1_cable.html
> 
> That cisco link does not specify the cable itself, but only
> the pin 
> outs.  True T1 cable has a foil shield around each
> pair, also called 
> ABAM cable in the telco world.
> 
> Ethernet cable is twisted pair without any shielding
> between pairs.
> 
> And one shield around all the pairs is not the same as
> ABAM.
> 
> Lyle Giese
> LCR Computer Services, Inc.
> 
> On 12/08/11 10:53, Carlos Alvarez wrote:
> > A T1 cable according to this spec:
> >
> > http://www.cisco.com/en/US/products/hw/routers/ps214/products_tech_note09186a00801f5d89.shtml
> >
> > Crossing the 1/2 to 4/5 if needed.
> >
> >
> > On Thu, Dec 8, 2011 at 9:37 AM, Olivier <oza_4h07 at yahoo.fr
> > <mailto:oza_4h07 at yahoo.fr>>
> wrote:
> >
> >     2011/12/8, Carlos Alvarez
> <carlos at televolve.com
> >     <mailto:carlos at televolve.com>>:
> >      > I am not Kevin, but I'll tell
> you that I will not EVER use an
> >     Ethernet
> >      > cable for T1 again. 
> Kevin and I have discussed this at length,
> >     and the
> >      > "should work" plays out
> poorly in the real world, or at least
> >     mine.  I've
> >      > had it be fine, and had major
> problems.  I can't even find a
> >     pattern to it,
> >      > like length of cable.
> >      >
> >      > In a colo cabinet that was
> direct-connected to a carrier, it
> >     worked great
> >      > for years and then one
> day...no T1.  Just gone.  Go down there
> >     and put in a
> >      > real T1 cable, came right up,
> still up years later.
> >      >
> >      > I usually make my own,
> >
> >     which type of cable are you
> then using ?
> >
> >
> >      > since they are so expensive
> to buy.  I just connect
> >      > the four needed pins, pretty
> easy to do if you're not trying to
> >     stuff all
> >      > eight wires into the
> connector.
> >      >
> >      >
> >      >
> >      > On Thu, Dec 8, 2011 at 5:57
> AM, Tony Mountifield
> >     <tony at softins.co.uk
> <mailto:tony at softins.co.uk>>
> wrote:
> >      >
> >      >> In article <4EE0B0E2.3050709 at digium.com
> >     <mailto:4EE0B0E2.3050709 at digium.com>>,
> >      >> Kevin P. Fleming <kpfleming at digium.com
> >     <mailto:kpfleming at digium.com>>
> wrote:
> >      >> >
> >      >> > As I said before...
> an Ethernet cable will work nearly all the
> >     time, and
> >      >> > at a 5m length it's
> probably fine.
> >      >>
> >      >> Kevin, under what
> circumstances would an Ethernet cable
> >     potentially not
> >      >> work with T1/E1? And in
> those circumstances, what should be used
> >     instead?
> >      >> I'm wondering because I
> had never realised it was an issue until
> >     you said.
> >      >>
> >      >> Cheers
> >      >> Tony
> >      >> --
> >      >> Tony Mountifield
> >      >> Work: tony at softins.co.uk
> <mailto:tony at softins.co.uk>
> -
> >     http://www.softins.co.uk
> >      >> Play: tony at mountifield.org
> <mailto:tony at mountifield.org>
> -
> >     http://tony.mountifield.org
> >      >>
> >      >> --
> >      >>
> > 
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> >      >
> >      >
> >      >
> >      > --
> >      > Carlos Alvarez
> >      > TelEvolve
> >      > 602-889-3003
> <tel:602-889-3003>
> >      >
> >
> >     --
> > 
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> >
> >
> >
> > --
> > Carlos Alvarez
> > TelEvolve
> > 602-889-3003
> >
> >
> >
> >
> > --
> >
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