PhillyKev 0 #1 June 24, 2004 I have one person telling me to switch 1 witn 4 and 2 with 5, and another telling me to switch 1 w/3 and 2 w/ 4. Anyone know for sure? Quote Share this post Link to post Share on other sites
Malev 0 #2 June 24, 2004 The correct wiring (based on the normal colour coding) for a crossover cable is: Head One White/Orange [Pin 1] Orange White/Green Blue White/Blue Green White/Brown Brown Head 2 White/Green [Pin 1] Green White/Orange Blue White/Blue Orange White/Brown Brown Edit: So, neither were right - its 1 and 3, 2 and 6 Quote Share this post Link to post Share on other sites
wildblue 7 #3 June 24, 2004 I don't think 4 and 5 are even used (depending on what you're doing) so I think they're lost. I thought it was like 1-3 and 2-6 for a loopback. QuoteThe correct wiring (based on the normal colour coding) for a crossover cable is: While that is correct, he asked for a loopback. Maybe he meant x-over? In either case, he has correct answers now it's like incest - you're substituting convenience for quality Quote Share this post Link to post Share on other sites
beowulf 1 #4 June 24, 2004 I believe the pins that are in use are 1,2,3 and 6 if you switch 1,2 with 3,6 it will give you a crossover cable. Best to follow the color coding shown in the previous post. 1,2,3,4,5,6,7,8 on one end and 3,6,1,4,5,2,7,8 on the other. Should give you a crossover cable Quote Share this post Link to post Share on other sites
caz 0 #5 June 24, 2004 you mean a crossover cable? if so... Standard End Pin 1 White/Orange Pin 2 Orange Pin 3 White/Green Pin 4 Blue Pin 5 White/Blue Pin 6 Green Pin 7 White/Brown Pin 8 Brown Crossover End Pin 1 White/Green Pin 2 Green Pin 3 White/Orange Pin 4 Blue Pin 5 White/Blue Pin 6 Orange Pin 7 White/Brown Pin 8 Brown Edit to add: bloody hell you guys type quickly! ~~~ London Skydivers ~~~ Quote Share this post Link to post Share on other sites
labrys 0 #6 June 24, 2004 QuoteI have one person telling me to switch 1 witn 4 and 2 with 5 Quote That's a T1 crossover. What are you trying to loop? The answer's I've seen assume you're looping an Ethernet cable.Owned by Remi #? Quote Share this post Link to post Share on other sites PhillyKev 0 #7 June 24, 2004 NOT Crossover. Ethernet loopback for a cisco router to a T1. Turns out they were both right. 1w/3 2w/6 is the standard but cisco uses their own of 1w/4 2w/5. Quote Share this post Link to post Share on other sites beowulf 1 #8 June 24, 2004 For a T1 1 > 5 2 > 4 3 > 3 4 > 2 5 > 1 6 > 6 7 > 7 8 > 8 Ohhh I see. don't deal much with routers. Have never needed to know that. Quote Share this post Link to post Share on other sites labrys 0 #9 June 24, 2004 QuoteNOT Crossover. Ethernet loopback for a cisco router to a T1. Turns out they were both right. 1w/3 2w/6 is the standard but cisco uses their own of 1w/4 2w/5. Nah. If you want to connect the Ethernet ports of 2 devices then you need Ethernet crossover (1/3 2/6). If you want to loop an Ethernet port you need to short 1/3 and 2/6. If you want to loop or crossover between DSU ports for a T1 you need to short or cross 1/4 2/5. It's not a Cisco thing at all. It's the cabling standards for Ethernet and T1. I don't get the idea behind ethernet loopback for a T1. You can't connect one to the other, and looping just isolates the connection.Owned by Remi #? Quote Share this post Link to post Share on other sites beowulf 1 #10 June 24, 2004 QuoteNOT Crossover. Ethernet loopback for a cisco router to a T1. Turns out they were both right. 1w/3 2w/6 is the standard but cisco uses their own of 1w/4 2w/5. hmmm This doesn't make sense to me. loopback is for testing. example recently we were having trouble with errors in our T1 circuit and so we did a loopback test on our CSU/DSU to rule out any problems with it. Ok to perform a loopback test we disconnected it from the DMark which is located two feet behind the CSU/DSU. and plugged the cable into a loopback jack which is just a small ciruit board with a rj45 jack on it. sounds like your router has an internal CSU/DSU and you are wanting to connect it to your T1. Then you would need to use the T1 crossover cable. At least I think that is right. Ours was setup before I started. I never needed to look that info up. Quote Share this post Link to post Share on other sites PhillyKev 0 #11 June 24, 2004 QuoteI don't get the idea behind ethernet loopback for a T1. You can't connect one to the other, and looping just isolates the connection. Yeah, exactly. I need to isolate it to test. You're right, not a cicso thing. it's an rj48 vs. rj45 thing. got it to work after I figured out there's a little tine loop back button on the csu module. Quote Share this post Link to post Share on other sites beowulf 1 #12 June 24, 2004 hmm sounds like you have the privilege of dealing with the company providing you your T1 line. We have SBC and it was real pain in the ass trying to convince them that the problem was in their hardware and not ours. That is once we tested everything up to the DMark. Quote Share this post Link to post Share on other sites Cajundude 0 #13 June 24, 2004 867-5309? Broadband Broadband who can I turn to you give me something I can hold on to now you think I'm like the others before who saw you pins and switches on the wall Broadband I got your number I need to make you mine Broadband don't change your number 867-5309, 867-5309, 867-5309, 867-5309 Broadband Broadband your the connection for me you don't know me, but you make me so happy I tried to connect you before but I lost the nerve I tried my imagination but I was disturbed Broadband I got your number I need to make you mine Broadband don't change your number 867-5309, 867-5309, 867-5309, 867-5309 I got it, I got it, I got your switches on the wall I got it, I got it, for a good time, for a good time call Broadband don't change your number I need to make you work Broadband I got your number 867-5309, 867-5309, 867-5309, 867-5309 Broadband Broadband who can I turn to (867-5309) for the price of a jump I can always turn to you Quote Share this post Link to post Share on other sites Guest #14 June 24, 2004 QuoteI have one person telling me to switch 1 witn 4 and 2 with 5, and another telling me to switch 1 w/3 and 2 w/ 4. Anyone know for sure? I'm seeing mention of a Cisco router in this thread - are you sure you don't mean a rollover (NOT a crossover) cable for a local ("console") connection? If so, just reverse the connections on P2: P1 -------------- White/Orange [Pin 1] Orange / White White/Green Blue / White White/Blue Green / White White/Brown Brown / White [Pin 8] P2 --------------- Brown /White [Pin 1] White/Brown Green / White White/Blue Blue / White White/Green Orange / White White/Orange [Pin 8] mh . Quote Share this post Link to post Share on other sites Kris 0 #15 June 24, 2004 Heh....I wish I'd seen this thread sooner. I'd have asked if you were using Cisco and told you about that wonderful loopback button. I still keep both an ethernet loopback plug and a T-1 plug in my tool bag just in case. AT&T is forever screwing up circuit installs and they're handy to have to jam into the smartjack on the wall so they can fix their mess. Also, at some of the installs I've done I've seen smartjacks with a loopback button built in as well. I'll be glad when they become more commonplace.Sky, Muff Bro, Rodriguez Bro, and Bastion of Purity and Innocence!™ Quote Share this post Link to post Share on other sites PhillyKev 0 #16 June 24, 2004 Quote(NOT a crossover) I never said crossover. I said loopback Thanks though. All straight now. Quote Share this post Link to post Share on other sites Guest #17 June 24, 2004 QuoteQuote(NOT a crossover) I never said crossover. I said loopback Thanks though. All straight now. No worries. The capitalized emphasis was for those readers who might not know the difference; I figured you did. mh ."The mouse does not know life until it is in the mouth of the cat." Quote Share this post Link to post Share on other sites hookitt 1 #18 June 24, 2004 Better yet, here's a link with a picture http://www.tikkiweb.net/tools/loopback.htmMy grammar sometimes resembles that of magnetic refrigerator poetry... Ghetto Quote Share this post Link to post Share on other sites labrys 0 #19 June 24, 2004 Great for Ethernet loopback. Won't help in this case 'cause he needed to loop a T1.Owned by Remi #? Quote Share this post Link to post Share on other sites labrys 0 #20 June 24, 2004 This is off-topic, but since all the geeks are here: Someone just tried to hack my Yahoo account. I got an alert from them about multiple access attempts too close together. Does anyone know who to contact at Yahoo to get the offender's IP address? I tried responding to the alert but I couldn't.Owned by Remi #? Quote Share this post Link to post Share on other sites beowulf 1 #21 June 24, 2004 I don't know who you would contact. But I doubt that they would give you that info. I had a laptop stolen that had ICQ set to log in at startup. I was able to get the ipaddress of the person that was using it. I gave the address to the police officer that was investigating and he was unable to get anything from AOL about the person using the laptop. ISP's are not very friendly when it comes to divulging info about their users. Quote Share this post Link to post Share on other sites Fast 0 #22 June 24, 2004 QuoteI don't know who you would contact. But I doubt that they would give you that info. I had a laptop stolen that had ICQ set to log in at startup. I was able to get the ipaddress of the person that was using it. I gave the address to the police officer that was investigating and he was unable to get anything from AOL about the person using the laptop. ISP's are not very friendly when it comes to divulging info about their users. They are getting much better at working with them though. I have heard many more stories of ISPs cooperating fully with law enforcment in the last few years. AOL... who knows.~D Where troubles melt like lemon drops Away above the chimney tops That's where you'll find me. Swooping is taking one last poke at the bear before escaping it's cave - davelepka Quote Share this post Link to post Share on other sites Join the conversation You can post now and register later. If you have an account, sign in now to post with your account. Note: Your post will require moderator approval before it will be visible. Reply to this topic... × Pasted as rich text. Paste as plain text instead Only 75 emoji are allowed. × Your link has been automatically embedded. Display as a link instead × Your previous content has been restored. Clear editor × You cannot paste images directly. Upload or insert images from URL. Insert image from URL × Desktop Tablet Phone Submit Reply 0 Go To Topic Listing
PhillyKev 0 #7 June 24, 2004 NOT Crossover. Ethernet loopback for a cisco router to a T1. Turns out they were both right. 1w/3 2w/6 is the standard but cisco uses their own of 1w/4 2w/5. Quote Share this post Link to post Share on other sites
beowulf 1 #8 June 24, 2004 For a T1 1 > 5 2 > 4 3 > 3 4 > 2 5 > 1 6 > 6 7 > 7 8 > 8 Ohhh I see. don't deal much with routers. Have never needed to know that. Quote Share this post Link to post Share on other sites
labrys 0 #9 June 24, 2004 QuoteNOT Crossover. Ethernet loopback for a cisco router to a T1. Turns out they were both right. 1w/3 2w/6 is the standard but cisco uses their own of 1w/4 2w/5. Nah. If you want to connect the Ethernet ports of 2 devices then you need Ethernet crossover (1/3 2/6). If you want to loop an Ethernet port you need to short 1/3 and 2/6. If you want to loop or crossover between DSU ports for a T1 you need to short or cross 1/4 2/5. It's not a Cisco thing at all. It's the cabling standards for Ethernet and T1. I don't get the idea behind ethernet loopback for a T1. You can't connect one to the other, and looping just isolates the connection.Owned by Remi #? Quote Share this post Link to post Share on other sites
beowulf 1 #10 June 24, 2004 QuoteNOT Crossover. Ethernet loopback for a cisco router to a T1. Turns out they were both right. 1w/3 2w/6 is the standard but cisco uses their own of 1w/4 2w/5. hmmm This doesn't make sense to me. loopback is for testing. example recently we were having trouble with errors in our T1 circuit and so we did a loopback test on our CSU/DSU to rule out any problems with it. Ok to perform a loopback test we disconnected it from the DMark which is located two feet behind the CSU/DSU. and plugged the cable into a loopback jack which is just a small ciruit board with a rj45 jack on it. sounds like your router has an internal CSU/DSU and you are wanting to connect it to your T1. Then you would need to use the T1 crossover cable. At least I think that is right. Ours was setup before I started. I never needed to look that info up. Quote Share this post Link to post Share on other sites
PhillyKev 0 #11 June 24, 2004 QuoteI don't get the idea behind ethernet loopback for a T1. You can't connect one to the other, and looping just isolates the connection. Yeah, exactly. I need to isolate it to test. You're right, not a cicso thing. it's an rj48 vs. rj45 thing. got it to work after I figured out there's a little tine loop back button on the csu module. Quote Share this post Link to post Share on other sites
beowulf 1 #12 June 24, 2004 hmm sounds like you have the privilege of dealing with the company providing you your T1 line. We have SBC and it was real pain in the ass trying to convince them that the problem was in their hardware and not ours. That is once we tested everything up to the DMark. Quote Share this post Link to post Share on other sites
Cajundude 0 #13 June 24, 2004 867-5309? Broadband Broadband who can I turn to you give me something I can hold on to now you think I'm like the others before who saw you pins and switches on the wall Broadband I got your number I need to make you mine Broadband don't change your number 867-5309, 867-5309, 867-5309, 867-5309 Broadband Broadband your the connection for me you don't know me, but you make me so happy I tried to connect you before but I lost the nerve I tried my imagination but I was disturbed Broadband I got your number I need to make you mine Broadband don't change your number 867-5309, 867-5309, 867-5309, 867-5309 I got it, I got it, I got your switches on the wall I got it, I got it, for a good time, for a good time call Broadband don't change your number I need to make you work Broadband I got your number 867-5309, 867-5309, 867-5309, 867-5309 Broadband Broadband who can I turn to (867-5309) for the price of a jump I can always turn to you Quote Share this post Link to post Share on other sites
Guest #14 June 24, 2004 QuoteI have one person telling me to switch 1 witn 4 and 2 with 5, and another telling me to switch 1 w/3 and 2 w/ 4. Anyone know for sure? I'm seeing mention of a Cisco router in this thread - are you sure you don't mean a rollover (NOT a crossover) cable for a local ("console") connection? If so, just reverse the connections on P2: P1 -------------- White/Orange [Pin 1] Orange / White White/Green Blue / White White/Blue Green / White White/Brown Brown / White [Pin 8] P2 --------------- Brown /White [Pin 1] White/Brown Green / White White/Blue Blue / White White/Green Orange / White White/Orange [Pin 8] mh . Quote Share this post Link to post Share on other sites
Kris 0 #15 June 24, 2004 Heh....I wish I'd seen this thread sooner. I'd have asked if you were using Cisco and told you about that wonderful loopback button. I still keep both an ethernet loopback plug and a T-1 plug in my tool bag just in case. AT&T is forever screwing up circuit installs and they're handy to have to jam into the smartjack on the wall so they can fix their mess. Also, at some of the installs I've done I've seen smartjacks with a loopback button built in as well. I'll be glad when they become more commonplace.Sky, Muff Bro, Rodriguez Bro, and Bastion of Purity and Innocence!™ Quote Share this post Link to post Share on other sites
PhillyKev 0 #16 June 24, 2004 Quote(NOT a crossover) I never said crossover. I said loopback Thanks though. All straight now. Quote Share this post Link to post Share on other sites
Guest #17 June 24, 2004 QuoteQuote(NOT a crossover) I never said crossover. I said loopback Thanks though. All straight now. No worries. The capitalized emphasis was for those readers who might not know the difference; I figured you did. mh ."The mouse does not know life until it is in the mouth of the cat." Quote Share this post Link to post Share on other sites
hookitt 1 #18 June 24, 2004 Better yet, here's a link with a picture http://www.tikkiweb.net/tools/loopback.htmMy grammar sometimes resembles that of magnetic refrigerator poetry... Ghetto Quote Share this post Link to post Share on other sites
labrys 0 #19 June 24, 2004 Great for Ethernet loopback. Won't help in this case 'cause he needed to loop a T1.Owned by Remi #? Quote Share this post Link to post Share on other sites
labrys 0 #20 June 24, 2004 This is off-topic, but since all the geeks are here: Someone just tried to hack my Yahoo account. I got an alert from them about multiple access attempts too close together. Does anyone know who to contact at Yahoo to get the offender's IP address? I tried responding to the alert but I couldn't.Owned by Remi #? Quote Share this post Link to post Share on other sites
beowulf 1 #21 June 24, 2004 I don't know who you would contact. But I doubt that they would give you that info. I had a laptop stolen that had ICQ set to log in at startup. I was able to get the ipaddress of the person that was using it. I gave the address to the police officer that was investigating and he was unable to get anything from AOL about the person using the laptop. ISP's are not very friendly when it comes to divulging info about their users. Quote Share this post Link to post Share on other sites
Fast 0 #22 June 24, 2004 QuoteI don't know who you would contact. But I doubt that they would give you that info. I had a laptop stolen that had ICQ set to log in at startup. I was able to get the ipaddress of the person that was using it. I gave the address to the police officer that was investigating and he was unable to get anything from AOL about the person using the laptop. ISP's are not very friendly when it comes to divulging info about their users. They are getting much better at working with them though. I have heard many more stories of ISPs cooperating fully with law enforcment in the last few years. AOL... who knows.~D Where troubles melt like lemon drops Away above the chimney tops That's where you'll find me. Swooping is taking one last poke at the bear before escaping it's cave - davelepka Quote Share this post Link to post Share on other sites