| Author |
Message |
Guest
|
 Posted:
Wed Jul 20, 2005 4:20 pm Post subject:
ISDN cable |
|
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Hi,
I am looking for some information on how I can make a cable that I can
use for ISDN video conferenceing equipment NT1 device. If you know all
Video conf equipments come with NT 1 devices which has three ports that
take the RJ45 style plugs.
I like to make a cable that has three RJ45 ends on one end and a
regular RJ45 plug on the other that I can use with this ISDN NT1
device. I only have one ethernet port and 1 phone port on my wall JAck.
rj45---
|
rj45----------------- rj45--to wall jack
|
rj45---
anyone has any idea's what is the color scheme and ping out.
Thanks in advance for all your help |
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|
 |
Doug McIntyre
Guest
|
| Posted:
Thu Jul 21, 2005 12:20 am Post subject:
Re: ISDN cable |
|
|
aiqbal@gbc.com writes:
| Quote: | I am looking for some information on how I can make a cable that I can
use for ISDN video conferenceing equipment NT1 device. If you know all
Video conf equipments come with NT 1 devices which has three ports that
take the RJ45 style plugs.
I like to make a cable that has three RJ45 ends on one end and a
regular RJ45 plug on the other that I can use with this ISDN NT1
device. I only have one ethernet port and 1 phone port on my wall JAck.
rj45---
|
rj45----------------- rj45--to wall jack
|
rj45---
anyone has any idea's what is the color scheme and ping out.
|
My NT1 device in the junk pile has 3 jacks, but they all go to
different things? Not to the wall?
One is simply for power. One is input, and one is output.
You'll have to really designate what your 3 jacks do? Are they
like mine? Or do you have a three input NT1 for 3 different BRI U
lines?
Typically, your NT1 would take an ISDN U signal, which comes in on the
center pair of a USOC jack, and breaks it out to an S/T bus which
plugs into your ISDN device. The S/T bus is either 2 pair or 4 pair
depending on your power bus and power requirements.
I think you are putting too much thought into this, what are you
really trying to do? Can't the NT1 just sit right next to the video
conferencing unit? What do the 3 jacks do? |
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Watson A.Name - \"Watt Su
Guest
|
| Posted:
Sat Jul 23, 2005 2:40 pm Post subject:
Re: ISDN cable |
|
|
<aiqbal@gbc.com> wrote in message
news:1121873371.992065.161830@g14g2000cwa.googlegroups.com...
| Quote: | Hi,
I am looking for some information on how I can make a cable that I can
use for ISDN video conferenceing equipment NT1 device. If you know all
Video conf equipments come with NT 1 devices which has three ports
that
take the RJ45 style plugs.
I like to make a cable that has three RJ45 ends on one end and a
regular RJ45 plug on the other that I can use with this ISDN NT1
device. I only have one ethernet port and 1 phone port on my wall
JAck.
rj45--- white-blue ---------\
\
rj45--- white-orange --------- rj45--to wall jack
/
rj45--- white-green --------/
anyone has any idea what is the color scheme and pin out.
|
Back when we used ISDN for our videoconferencing, I made up an adapter
to do this. I used four port surface mount box and four RJ-45 jacks.
Each of the pairs is punched down the the white-blue pair of the jacks
on the left. See above.
We then got rid of all our ISDN stuff and now the VC goes over the IP
backbone (we have Cisco switches, etc).
> Thanks in advance for all your help |
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|
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Watson A.Name - \"Watt Su
Guest
|
| Posted:
Sat Jul 23, 2005 2:46 pm Post subject:
Re: ISDN cable |
|
|
"Doug McIntyre" <merlyn@geeks.org> wrote in message
news:42dea743$0$87548$892e0abb@auth.newsreader.octanews.com...
| Quote: | aiqbal@gbc.com writes:
I am looking for some information on how I can make a cable that I
can
use for ISDN video conferenceing equipment NT1 device. If you know
all
Video conf equipments come with NT 1 devices which has three ports
that
take the RJ45 style plugs.
I like to make a cable that has three RJ45 ends on one end and a
regular RJ45 plug on the other that I can use with this ISDN NT1
device. I only have one ethernet port and 1 phone port on my wall
JAck.
rj45---
|
rj45----------------- rj45--to wall jack
|
rj45---
anyone has any idea's what is the color scheme and ping out.
My NT1 device in the junk pile has 3 jacks, but they all go to
different things? Not to the wall?
One is simply for power. One is input, and one is output.
You'll have to really designate what your 3 jacks do? Are they
like mine? Or do you have a three input NT1 for 3 different BRI U
lines?
|
Picturetel used three separate RJ-45 jacks for three BRI lines, each
having two 'B' phone numbers. Total data rate was 384kbps. Nowadays
people often change to a DSL line to save money.
| Quote: | Typically, your NT1 would take an ISDN U signal, which comes in on the
center pair of a USOC jack, and breaks it out to an S/T bus which
plugs into your ISDN device. The S/T bus is either 2 pair or 4 pair
depending on your power bus and power requirements.
I think you are putting too much thought into this, what are you
really trying to do? Can't the NT1 just sit right next to the video
conferencing unit? What do the 3 jacks do? |
|
|
| Back to top |
|
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