On 7 Apr 2006 06:49:18 -0700, "fl" <rxjwg98@gmail.com> wrote:

>
>Allan Herriman wrote:
>> On 6 Apr 2006 09:31:19 -0700, "fl" <rxjwg98@gmail.com> wrote:
>>
>> >Hi,
>> >I want to find the ISDN standard after I read a paper. In the reference
>> >of the paper, it refers to:
>> >
>> >Amer. Nat. Std. Telecommun., "Integrated services digital network
>> >(ISDN)-Basic access interface for use on metallic loops for application
>> >on the network side of the NT (layer 1 specification)", LB Draft Rev.
>> >T12.601.1988, Jan. 9, 1991
>> >
>> >I hope some ISDN specialist can tell me about this.
>> >
>> >Thank you very much.
>>
>>
>> I've built ISDN equipment, but I wouldn't call myself a specialist.
>> The ISDN standards are here:
>> http://www.itu.int/rec/T-REC-I/e
>>
>>
>> T12.601 sounds like an ANSI standard.  When I search the ANSI site, I
>> can't find that number, but I can find:
>>
>> ANSI T1.601-1999 (R2004)
>> ISDN Basic Access Interface for Use on Metallic Loops for Application
>> at the Network Side of NT, Layer 1 Specification
>> http://webstore.ansi.org/ansidocstore/product.asp?sku=ANSI+T1%2E601%2D1999+%28R2004%29
>>
>>
>> US$251  Ouch.  The ITU-T version should be identical, but much
>> cheaper.
>>
>> BTW, this is off-topic for comp.dsp.
>>
>> Regards,
>> Allan
>
>Thank you very much. From the first a few words: Amer. Nat. Std.
>Telecommun, it looks like ANSI standard. To my surprise, they are not
>free, as 802.11, 16 etc.
>In fact, I want to know the detail of their channel model from partial
>information of the paper. The paper tells three channel models.
>a. ANSI digital subscriber line #1 with the first post cursor h1=0.91;
>b. ANSI digital subscriber line #3 with the first post cursor h1=0.8;
>c. "zero loop" with h1=-0.51.
>I want to know the above three channels have two taps, h0(=1), and h1?

The channel models (know as test loops) are complicated, and are
specified in terms of wire gauges, insulation types, lengths and
positions of taps.

I don't recall the exact details (not having designed this sort of
equipment since the '90s).

You might be interested in ETSI ETR-080, which describes the same
interface, but has different test loops.

Regards,
Allan

Allan Herriman wrote:
> On 6 Apr 2006 09:31:19 -0700, "fl" <rxjwg98@gmail.com> wrote:
>
> >Hi,
> >I want to find the ISDN standard after I read a paper. In the reference
> >of the paper, it refers to:
> >
> >Amer. Nat. Std. Telecommun., "Integrated services digital network
> >(ISDN)-Basic access interface for use on metallic loops for application
> >on the network side of the NT (layer 1 specification)", LB Draft Rev.
> >T12.601.1988, Jan. 9, 1991
> >
> >I hope some ISDN specialist can tell me about this.
> >
> >Thank you very much.
>
>
> I've built ISDN equipment, but I wouldn't call myself a specialist.
> The ISDN standards are here:
> http://www.itu.int/rec/T-REC-I/e
>
>
> T12.601 sounds like an ANSI standard.  When I search the ANSI site, I
> can't find that number, but I can find:
>
> ANSI T1.601-1999 (R2004)
> ISDN Basic Access Interface for Use on Metallic Loops for Application
> at the Network Side of NT, Layer 1 Specification
> http://webstore.ansi.org/ansidocstore/product.asp?sku=ANSI+T1%2E601%2D1999+%28R2004%29
>
>
> US$251  Ouch.  The ITU-T version should be identical, but much
> cheaper.
>
> BTW, this is off-topic for comp.dsp.
>
> Regards,
> Allan

Thank you very much. From the first a few words: Amer. Nat. Std.
Telecommun, it looks like ANSI standard. To my surprise, they are not
free, as 802.11, 16 etc.
In fact, I want to know the detail of their channel model from partial
information of the paper. The paper tells three channel models.
a. ANSI digital subscriber line #1 with the first post cursor h1=0.91;
b. ANSI digital subscriber line #3 with the first post cursor h1=0.8;
c. "zero loop" with h1=-0.51.
I want to know the above three channels have two taps, h0(=1), and h1?

On 6 Apr 2006 09:31:19 -0700, "fl" <rxjwg98@gmail.com> wrote:

>Hi,
>I want to find the ISDN standard after I read a paper. In the reference
>of the paper, it refers to:
>
>Amer. Nat. Std. Telecommun., "Integrated services digital network
>(ISDN)-Basic access interface for use on metallic loops for application
>on the network side of the NT (layer 1 specification)", LB Draft Rev.
>T12.601.1988, Jan. 9, 1991
>
>I hope some ISDN specialist can tell me about this.
>
>Thank you very much.


I've built ISDN equipment, but I wouldn't call myself a specialist.
The ISDN standards are here:
http://www.itu.int/rec/T-REC-I/e


T12.601 sounds like an ANSI standard.  When I search the ANSI site, I
can't find that number, but I can find:

ANSI T1.601-1999 (R2004)
ISDN Basic Access Interface for Use on Metallic Loops for Application
at the Network Side of NT, Layer 1 Specification
http://webstore.ansi.org/ansidocstore/product.asp?sku=ANSI+T1%2E601%2D1999+%28R2004%29


US$251  Ouch.  The ITU-T version should be identical, but much
cheaper.

BTW, this is off-topic for comp.dsp.

Regards,
Allan

Hi,
I want to find the ISDN standard after I read a paper. In the reference
of the paper, it refers to:

Amer. Nat. Std. Telecommun., "Integrated services digital network
(ISDN)-Basic access interface for use on metallic loops for application
on the network side of the NT (layer 1 specification)", LB Draft Rev.
T12.601.1988, Jan. 9, 1991

I hope some ISDN specialist can tell me about this.

Thank you very much.