Pinouts for T1/E1 crossover cable WAS "RE: [Asterisk-Users] whatcable to connect a legacy PBX to a TE410P ?"

[Alexander Lopez]

> -----Original Message-----
> From: asterisk-users-bounces at lists.digium.com [mailto:asterisk-users-
> bounces at lists.digium.com] On Behalf Of Kevin P. Fleming
> Sent: Monday, April 24, 2006 12:14 PM
> To: Asterisk Users Mailing List - Non-Commercial Discussion
> Subject: Re: Pinouts for T1/E1 crossover cable WAS "RE:
[Asterisk-Users]
> whatcable to connect a legacy PBX to a TE410P ?"
> 
> Rich Adamson wrote:
> 
> > Oh, and if shielded T1 cable is used, the shield at each end of the
> > cable must be grounded. (Let's see how many can figure out how to do
> > that via an rj45 plug. ;)
> 
> You use shielded plugs and jacks, of course :-) That is why the
> TE405P/TE410P have shielded jacks (as of about a year ago, IIRC). The
> retail packaged cards even ship with four shielded cables included!
> 
> Minor point: isn't it safer to only ground the shield on one end?
> _______________________________________________
If you want to fry your cards attach both sides to ground, I don't know
about the engineering specs but 'floating' one side has always
eliminated ground-loops, and the possibility of lightning damaging the
cards. As a rule I always ground the side furthest from my equipment as
I want the lightning to go that-a-way!!!

Electricity is lazy by nature and always tries to find the shortest
(least resistive) path to ground. I make sure that my CPE uphill for the
spike..