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Ghazan Haider
Guest
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 Posted: Sun Aug 24, 2003 3:12 pm Post subject: BRI back-to-back cable pinout? |
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I have been searching this over the newsgroups, routerie.com forum and
cisco.com but cant find any details on it...
I have two 2503 routers and would like to connect their BRI ports
together. They are RJ-45 ports. I have tried straight-through ethernet
patch cables and another cable from Hanseng Bae's FAQ's link that
swaps 4 and 5 pins with 3 and 7. Neither cable gives the famous 'line
up' message on the console that you get when you plug in ethernet,
tokenring or serial cables. I cannot verify the connection since I'm
just learning about ISDN and uncertainity of the cable is getting in
the way.
Can someone please verify if the cable to be used is patch
straightthrough or 4->3 5->7 and where in the world is this
information officially provided (or did Cisco leave this as an
exercise to the admin?)
Will appreciate it! |
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Simon Marsden
Guest
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| Posted: Sun Aug 24, 2003 3:12 pm Post subject: Re: BRI back-to-back cable pinout? |
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Only pins 3,4,5 and 6 are use in a ISDN BRI S/T RJ-45 pinout.
So in theory, a crossed cable should be 3-4,4-3,5-6,6-5.
But that said, I always thought you need an ISDN simulator to provide TEI
and the Q921 signalling etc...
This link refers to 1600 series, but it's the same technology.
http://www.cisco.com/univercd/cc/td/doc/product/access/acs_mod/1600/1600icg/
cabl.htm#15448
"Ghazan Haider" <ghazan@ghazan.haider.name> wrote in message
news:2f57764a.0308240212.6a833ec@posting.google.com...
| Quote: | I have been searching this over the newsgroups, routerie.com forum and
cisco.com but cant find any details on it...
I have two 2503 routers and would like to connect their BRI ports
together. They are RJ-45 ports. I have tried straight-through ethernet
patch cables and another cable from Hanseng Bae's FAQ's link that
swaps 4 and 5 pins with 3 and 7. Neither cable gives the famous 'line
up' message on the console that you get when you plug in ethernet,
tokenring or serial cables. I cannot verify the connection since I'm
just learning about ISDN and uncertainity of the cable is getting in
the way.
Can someone please verify if the cable to be used is patch
straightthrough or 4->3 5->7 and where in the world is this
information officially provided (or did Cisco leave this as an
exercise to the admin?)
Will appreciate it! |
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Hansang Bae
Guest
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| Posted: Mon Aug 25, 2003 2:39 am Post subject: Re: BRI back-to-back cable pinout? |
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In article <2f57764a.0308240212.6a833ec@posting.google.com>,
ghazan@ghazan.haider.name says...
| Quote: | I have been searching this over the newsgroups, routerie.com forum and
cisco.com but cant find any details on it...
I have two 2503 routers and would like to connect their BRI ports
together. They are RJ-45 ports. I have tried straight-through ethernet
patch cables and another cable from Hanseng Bae's FAQ's link that
swaps 4 and 5 pins with 3 and 7. Neither cable gives the famous 'line
up' message on the console that you get when you plug in ethernet,
tokenring or serial cables. I cannot verify the connection since I'm
just learning about ISDN and uncertainity of the cable is getting in
the way.
|
The FAQ is talking about T1 cables. Recent IOS can only simulate PRI
switches. So there is no way to make a BRI setup work with a cross over
cable.
--
hsb
"Somehow I imagined this experience would be more rewarding" Calvin
*************** USE ROT13 TO SEE MY EMAIL ADDRESS ****************
********************************************************************
Due to the volume of email that I receive, I may not not be able to
reply to emails sent to my account. Please post a followup instead.
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Ghazan Haider
Guest
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| Posted: Mon Aug 25, 2003 7:02 am Post subject: Re: BRI back-to-back cable pinout? |
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Hi Bae,
someone sent me this on email:
You will need a ISDN switch of some kind, the BRI ports on a 25xx is
client-side
+onlyand need further equipment to make connections, there are a
number of
+ISDN-network emulators outthere, one name that comes to mind is
"Emutel"
and you mentioned recent (12.1?) IOSes can emulate ISDN switches.
Lemme go check if I can do that. I'll try straight cables first and
post the result here if I'm successful. |
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Hansang Bae
Guest
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| Posted: Mon Aug 25, 2003 9:23 am Post subject: Re: BRI back-to-back cable pinout? |
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In article <2f57764a.0308241802.485df0f2@posting.google.com>,
ghazan@ghazan.haider.name says...
| Quote: | Hi Bae,
someone sent me this on email:
You will need a ISDN switch of some kind, the BRI ports on a 25xx is
client-side
+onlyand need further equipment to make connections, there are a
number of
+ISDN-network emulators outthere, one name that comes to mind is
"Emutel"
and you mentioned recent (12.1?) IOSes can emulate ISDN switches.
Lemme go check if I can do that. I'll try straight cables first and
post the result here if I'm successful.
|
Again...it'll emulate *PRI* only. You're out of luck for BRI.
--
hsb
"Somehow I imagined this experience would be more rewarding" Calvin
*************** USE ROT13 TO SEE MY EMAIL ADDRESS ****************
********************************************************************
Due to the volume of email that I receive, I may not not be able to
reply to emails sent to my account. Please post a followup instead.
******************************************************************** |
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Ghazan Haider
Guest
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| Posted: Mon Aug 25, 2003 6:41 pm Post subject: Re: BRI back-to-back cable pinout? |
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| Quote: | Again...it'll emulate *PRI* only. You're out of luck for BRI.
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Can you not connect a BRI to PRI using only 1 or 2 of the PRI's
channels?
Last night I ordered ISDN Internet for a month anyway, will run
webservers on it. Beats an ISDN emulator. Only after I ordered it, I'm
beginning to check if it can run in parallel with my DSL and wondering
what my SPIDs are. Line protocol is consistently down, so I suspect my
phone line doesnt support ISDN. |
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