[Asterisk-Users] some EICON Diva 4BRI questions

[Klaus Darilion]

Armin Schindler wrote:
> On Wed, 26 Apr 2006, Klaus Darilion wrote:
>> On Sun, April 23, 2006 16:30, Armin Schindler said:
>>> On Sat, 22 Apr 2006, Klaus Darilion wrote:
>>>> But I'm still confused. Usually, if a line needs termination, the
>>>> termination is needed on both ends. Thus, if there is no line
>>>> termination
>>>> inside the DIVA card, we would termination in TE mode too.
>>> Sorry, I don't know why this is different to 'normal' ISDN line. Maybe
>>> the difference is about the distance. A normal ISDN line may be more than
>>> a
>>> few meters, but in NT-mode I have my PBX/Equipment connected to the card
>>> with a one meter cross-cable.
>>>
>>> I will try to find out more about this.
>> Hi Armin!
>>
>> Could you find out something?
> 
> Yes, I asked Eicon. The cards don't have internal termination. The ports are
> layed out for TE mode, so depending on your ISDN bus topology, you need a 
> termination.
> And you are right, when in NT-mode both sides needs termination.... just 
> normal ISDN bus topology.

This still confuses me. In P2P mode, there is always one device in NT 
mode, and one device in TE mode. Usually termination is needed on both 
sides of the cable.

If the EICON DIVA does not have termination resistors inside (IMO a real 
weakness, all the cheaper cards do have them and you can enable them 
with jumpers), I would think that we need external resistors in both 
cases, regardless if EICON DIVA is in NT or TE mode.

> Since I have only one termination in the middle of my cross cable, which 
> works fine, I assume that the termination is not really necessary on both 
> sides when having just a one meter cable.

btw: do you know where I can by this cables (I do not like soldering)? 
Does EICON offer this cables (for fixing their design bug)?

regards
klaus