similar to: Re: Shielding of T1/E1 cables WAS RE: Pinoutsfor T1/E1 crossover

> Unless you're going for some kind of distance record, standard Cat5 will > work > without any issue on any modern installation. As I said, I'm pretty sure > (not 100%, but close) that the T1 specification is only Cat3, since it's > standard BellCore wire and they don't run your T1 loops (which aren't T1 > anymore, they're DS1 over HDSL or HDSL2) in

> I've never bothered to check to see if cat5 cables use the appropriate > mating twisted pairs or not. Since the pinouts are different for cat5 vs > T1 cables, I'd have to guess a single strand is used from two different > twisted pair groups. That wouldn't be cool, but in short runs it > probably doesn't have much of an impact. > IIRC, standard Ethernet uses

>> >>Good thing he doesn't work for a cable manufacturer as that's >>a total crock of crap that even an inexperienced person >>should be able to detect. (You can't twist two wires to make >>them weight three times as much, or cost three times as much.) He may have started out as an underground lineman, posibly inhaling too much swamp gas and CO from

My telco used cat5 as well for the demarc to CPE. It's also with noting that many channel banks, such as my Atlas, and zapata.conf itself also have parameters to allow you to tune the gains to compensate for cable signal loss. I've never had to touch them, and my CPE is about 300 feet from the PRI demarc (with an ordinary Cat5 cable connecting them)

I was once told by a lineman that the cables they use didn't have that many twists in them because it wasn't needed, and that the extra twists would effectively use more cable and thus cost and weigh more than triple what they do now. He told me that with the number of twists in the Cat 5 cable it would cancel out any interference, but he also stated that the effective length was

> Close. 10/100mbps Ethernet uses wires 1,2,3,6 but that is pair 2 & 3. > Pair > one is the pair up the dead center (pins 4&5), pair 2 is pins 1&2, pair 3 > is > 3&6 and pair 4 is 7&8. A T1 uses pairs 1&2, which is why you can't use a > regular crossover cable for a T1 crossover, but you can use a regular > ethernet patch cable as a T1 patch

Can't anyone stop self-promotion and tell the poor guy what he needs. A T1/E1 X-over cable using an RJ-45 (8-cond.) is pinned out as follows: 1 - 4 2 - 5 3 - NU 4 - 1 5 - 2 6 - NU 7 - NU 8 - NU NU = Not Used I have not in my experience seen any problems with using a Good Quality Cat5 vs. Cat 3 (telco standard) cable for X-connects. YMMV, but you should be fine. As far as the shielding

I agree. I haven't had a problem using CAT-5, even for long runs, however it's not a real T-Carrier cable and I didn't know how old the PBX is. Paul >I have not in my experience seen any problems with using a Good Quality >Cat5 vs. Cat 3 (telco standard) cable for X-connects. YMMV, but you >should be fine. As far as the shielding goes, I use UTP cables and >Connectors

I have used cross-connect wire from the spool to make T1 crossover cables with RJ45 ends. All that matters is that pin one goes to four and two goes to five on both ends. ________________________________ From: asterisk-users-bounces@lists.digium.com on behalf of Andrew Sent: Sat 4/22/2006 2:51 PM To: Asterisk Users Mailing List - Non-Commercial Discussion Subject: Re: Pinouts for T1/E1

I for one think it is a great idea to buy a book with hard earned money and wait a few days to a week just to get an answer to a question that is freely available on the internet immediately. Hard pressed to think of anything in the "book" that is not on with wiki with more up to date and useful information. -----Original Message----- From: Alexander Lopez

I tend to use the soft sell. Looks like I Just self-promoted :-) -----Original Message----- From: asterisk-users-bounces@lists.digium.com [mailto:asterisk-users-bounces@lists.digium.com] On Behalf Of John Novack Sent: Saturday, April 22, 2006 12:05 PM To: Asterisk Users Mailing List - Non-Commercial Discussion Subject: Re: Pinouts for T1/E1 crossover cable WAS "RE: [Asterisk-Users]

> -----Original Message----- > From: asterisk-users-bounces@lists.digium.com [mailto:asterisk-users- > bounces@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

At Sangoma we do quite a lot of back-to back T1 and E1 connections. T1 is not a very fussy connection, as the baud rate is only about 750 kbps. In our experience, for error free communications you can use the following rules of thumb: Up to 50 ft: Flat patch cable Up to 500 ft: Ordinary twisted telephone cable Cat 5 may be overkill unless you are going hundreds of feet. David Yat Sin

The "telco guys" probably did something non-industry standard and reversed send and receive in the jack that they plugged the CAT5 into. Sure it works, sure it is easier, sure it is not the correct way of doing things. Thanks, Steve ________________________________ From: asterisk-users-bounces@lists.digium.com on behalf of Lacy Moore - Aspendora Sent: Sat 4/22/2006 2:55 PM To: Paul

Hi People! Is there an underground asterisk command reference manual that the Gurus here share amongst themselves only? :-) The reason I ask is that sometimes I see mention of an asterisk command and I scramble for my asterisk book (pdf) to look it up but can't find it in there. For example, I saw here last week people talking about the Set() application with the "If" conditional

I was tinkering with Asterisk and the Festival text-to-speech engine, and wrote some short Asterisk::AGI scripts to read back live weather reports. After that, I thought I needed something more interactive to work with... Then I had a flashback to 1996, first year university, standing in the C & O club at the University of Waterloo, where someone had just pulled out their US Robotics Palm

Take what I say with a grain of salt: I'm an amateur and haven't actually touched Speex in any way, yet. I'm just sort of passing on personal belief from personal experience. Also, check and make sure that the microphone line is insulated. There are a number of problems with sound cards picking up interference from the host machine. The wires that run between ICs on a card

Understand that it's a *guess*. If this fixes or at least betters the situation, you're going to need to find a legit way to insulate these cards, or to switch cards. If it's for customers, I should hope you wouldn't be using enamelled aluminum foil. :D -----Original Message----- From: Tongbiao Li [mailto:tli@viack.com] Sent: Thursday, September 18, 2003 11:20 AM To:

Thanks for the speedy response and detailed, enlightening explanation. Now I understand where the problem is, and will try out your suggestions just to further confirm my conjecture. When I am done, I have to take the foil out, though. This is a product for our customers to use, and although we've got budget for mulffing every sound card we developers use, most likely the company

I'm connecting a T1 PCI card to a Nortel Option 61 switch T1 card. My Sangoma A102D shipped with 2 T1 cables - which I assume are straight through. Do I need to make crossover cables for this scenario? Thanks -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.digium.com/pipermail/asterisk-users/attachments/20071026/9cea5e74/attachment.htm