| Author |
Message |
Siva U. Shankar
Guest
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 Posted:
Sun Jun 05, 2005 8:15 am Post subject:
Problem in Cable installation |
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Hi guys!
I have a serious problem.
I've connected a 3com office connect 16 port switch like the following way
the netwotk is not working can u help me to figure out why?
3com office connect --> CAT5e 586A cable --> both end 586A wall socket
connected CAT5e cable --> straight through/ 586A cable --> to a winXP
computer
when connected this way it says in the computer, repeats these two
messages. - network cable is unplugged/acquiring network parameters (This
message is contineously repeated on its own. There is no connected lite
indicater in the switch either.
When i connect the computer direct to the 3COM office connect it works fine.
Where is my mistake, I'm a new bie for cabling. Pls help me to sort it out.
Or suggest me a good website for me to refer..
Thanks in advance.
Shankar |
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Dale Farmer
Guest
|
| Posted:
Sun Jun 05, 2005 8:20 am Post subject:
Re: Problem in Cable installation |
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"Siva U. Shankar" wrote:
| Quote: | Hi guys!
I have a serious problem.
I've connected a 3com office connect 16 port switch like the following way
the netwotk is not working can u help me to figure out why?
3com office connect --> CAT5e 586A cable --> both end 586A wall socket
connected CAT5e cable --> straight through/ 586A cable --> to a winXP
computer
when connected this way it says in the computer, repeats these two
messages. - network cable is unplugged/acquiring network parameters (This
message is contineously repeated on its own. There is no connected lite
indicater in the switch either.
When i connect the computer direct to the 3COM office connect it works fine.
Where is my mistake, I'm a new bie for cabling. Pls help me to sort it out.
Or suggest me a good website for me to refer..
Thanks in advance.
Shankar
|
Problem in the wall. Pull the plates off and reterminate the cables onto
the
jacks. Overwhelmingly likely to be a miswire on one of the jacks. Next
runner up most likely cause is that the cables you think are connected in the
wall are actually going someplace else. But since you imply you get a link
light on the computer, you probably have a miswire.
--Dale |
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James Knott
Guest
|
| Posted:
Sun Jun 05, 2005 4:20 pm Post subject:
Re: Problem in Cable installation |
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Siva U. Shankar wrote:
| Quote: | When i connect the computer direct to the 3COM office connect it works
fine.
Where is my mistake, I'm a new bie for cabling. Pls help me to sort it
out. Or suggest me a good website for me to refer..
|
You've obviously got a cable problem somewhere. You've got two patch cables
and one wired between the jacks. First verify both patch cables, you've
already done one. Then check the cable between jacks. Is there another
one you can try? Check continuity and also that the pairing is correct.
Also, make sure the jacks are OK. Problems with them are rare, but I've
occasionally seen ones, where one of the gold wires was not in the proper
position.
If you can get your hands on one, a cable tester will help. |
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John P. Dearing
Guest
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| Posted:
Mon Jun 06, 2005 12:20 am Post subject:
Re: Problem in Cable installation |
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Al Dykes wrote:
| Quote: | Back in the day before I had a budget for tools (and inhereted a
crappy infrastructure) I got a lot of use out of a 100 ft ethernet
patch cord. It was long enough for me to backhaul from the PC any
office to, in my case, the equipment closet patch panel, or even a
server.
One of these will let you do an end-to-end test, skipping
alll the existing parts.
If you get one take care of it. Get a plastic thingy used to coil up
power extension cords. Don't kink or step on it.
|
Excellent idea!
I'd also make up a second one that is a crossover cable. Use a
completely different colored cable (like red or purple) so that you know
right away that this is the crossover cable.
John
--
John P. Dearing
A+, Network+, Server+
To reply: Just drop "YOURPANTS" in my address! 8-) |
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John P. Dearing
Guest
|
| Posted:
Mon Jun 06, 2005 12:20 am Post subject:
Re: Problem in Cable installation |
|
|
Siva U. Shankar wrote:
| Quote: | I've connected a 3com office connect 16 port switch like the following way
the netwotk is not working can u help me to figure out why?
3com office connect --> CAT5e 586A cable --> both end 586A wall socket
connected CAT5e cable --> straight through/ 586A cable --> to a winXP
computer
|
Are you *absolutely* certain that *both* ends are 568A. If one end of
the cable is terminated 568A and the other end is terminated 568B then
you effectively wind up with a crossover cable and not a straight
through cable.
By the termination, I'm not talking about the cable, I'm talking about
the jacks. There is no such thing as 568A or 568B cable. Cable is cable,
It can be rated to be compatible with the 568 wiring specification, but
the cable isn't 568A or 568B. What *is* important are the terminations
(jacks) at each end. It's the way the cable is terminated that
determines if it is 568A or 568B.
You can buy jacks that are 568A and you can buy jacks that are 568B. As
long as you pick one kind and just one kind and stick with it, all will
be fine. Start mixing 568A and 568B and you'll start having these problems.
| Quote: | when connected this way it says in the computer, repeats these two
messages. - network cable is unplugged/acquiring network parameters (This
message is contineously repeated on its own. There is no connected lite
indicater in the switch either.
|
And I'll bet that eventually you end up with a 169.154.x.x IP address,
don't you?
That's APIPA. Automatic Private IP Addressing. When a Microsoft box
can't get an IP address from a DHCP server it turns to APIPA to randomly
assign a class B address by default.
| Quote: | When i connect the computer direct to the 3COM office connect it works fine.
|
So we've just eliminated the PC as a source of the trouble.
I'm betting that you have a wiring problem between the jacks and patch
panel.
John
--
John P. Dearing
A+, Network+, Server+
To reply: Just drop "YOURPANTS" in my address! 8-) |
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Al Dykes
Guest
|
| Posted:
Mon Jun 06, 2005 12:20 am Post subject:
Re: Problem in Cable installation |
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|
In article <X_Loe.12264$MX2.11668@trndny03>,
John P. Dearing <John.Dearing@VerYOURPANTSizon.NET> wrote:
| Quote: | Siva U. Shankar wrote:
I've connected a 3com office connect 16 port switch like the following way
the netwotk is not working can u help me to figure out why?
3com office connect --> CAT5e 586A cable --> both end 586A wall socket
connected CAT5e cable --> straight through/ 586A cable --> to a winXP
computer
Are you *absolutely* certain that *both* ends are 568A. If one end of
the cable is terminated 568A and the other end is terminated 568B then
you effectively wind up with a crossover cable and not a straight
through cable.
By the termination, I'm not talking about the cable, I'm talking about
the jacks. There is no such thing as 568A or 568B cable. Cable is cable,
It can be rated to be compatible with the 568 wiring specification, but
the cable isn't 568A or 568B. What *is* important are the terminations
(jacks) at each end. It's the way the cable is terminated that
determines if it is 568A or 568B.
You can buy jacks that are 568A and you can buy jacks that are 568B. As
long as you pick one kind and just one kind and stick with it, all will
be fine. Start mixing 568A and 568B and you'll start having these problems.
when connected this way it says in the computer, repeats these two
messages. - network cable is unplugged/acquiring network parameters (This
message is contineously repeated on its own. There is no connected lite
indicater in the switch either.
And I'll bet that eventually you end up with a 169.154.x.x IP address,
don't you?
That's APIPA. Automatic Private IP Addressing. When a Microsoft box
can't get an IP address from a DHCP server it turns to APIPA to randomly
assign a class B address by default.
When i connect the computer direct to the 3COM office connect it works fine.
So we've just eliminated the PC as a source of the trouble.
I'm betting that you have a wiring problem between the jacks and patch
panel.
John
|
Back in the day before I had a budget for tools (and inhereted a
crappy infrastructure) I got a lot of use out of a 100 ft ethernet
patch cord. It was long enough for me to backhaul from the PC any
office to, in my case, the equipment closet patch panel, or even a
server.
One of these will let you do an end-to-end test, skipping
alll the existing parts.
If you get one take care of it. Get a plastic thingy used to coil up
power extension cords. Don't kink or step on it.
--
a d y k e s @ p a n i x . c o m
Don't blame me. I voted for Gore. |
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Siva U. Shankar
Guest
|
| Posted:
Mon Jun 06, 2005 8:20 am Post subject:
Re: Problem in Cable installation |
|
|
Hi!
The computer side jack is a Leviton RJ45 jack. They have color coding for
both 568A and B on the same block. I've used the 568A
The actual cable is 568A CAT 6 UTP cable.
On the router side I used a LCT or ICT (I'm not sure 100%) terminal block
(four points in a block) the problem is there is no color marking on the pin
layout. But it gives a BIX block type connector from 1 to 8 from left to
right when u keep the clip side down. I've used the same pin color
combination as the other side.
U r right when i was trying different cable combinations on both jacks, at
one point I got the IP address as u suggested. I' was thrilled thinking it
is atlast started to work. But on the switch side no indication for a
connection!!!
Regards
Shankar
"John P. Dearing" <John.Dearing@VerYOURPANTSizon.NET> wrote in message
news:X_Loe.12264$MX2.11668@trndny03...
| Quote: | Siva U. Shankar wrote:
I've connected a 3com office connect 16 port switch like the following
way
the netwotk is not working can u help me to figure out why?
3com office connect --> CAT5e 586A cable --> both end 586A wall socket
connected CAT5e cable --> straight through/ 586A cable --> to a winXP
computer
Are you *absolutely* certain that *both* ends are 568A. If one end of
the cable is terminated 568A and the other end is terminated 568B then
you effectively wind up with a crossover cable and not a straight
through cable.
By the termination, I'm not talking about the cable, I'm talking about
the jacks. There is no such thing as 568A or 568B cable. Cable is cable,
It can be rated to be compatible with the 568 wiring specification, but
the cable isn't 568A or 568B. What *is* important are the terminations
(jacks) at each end. It's the way the cable is terminated that
determines if it is 568A or 568B.
You can buy jacks that are 568A and you can buy jacks that are 568B. As
long as you pick one kind and just one kind and stick with it, all will
be fine. Start mixing 568A and 568B and you'll start having these
problems.
when connected this way it says in the computer, repeats these two
messages. - network cable is unplugged/acquiring network parameters
(This
message is contineously repeated on its own. There is no connected lite
indicater in the switch either.
And I'll bet that eventually you end up with a 169.154.x.x IP address,
don't you?
That's APIPA. Automatic Private IP Addressing. When a Microsoft box
can't get an IP address from a DHCP server it turns to APIPA to randomly
assign a class B address by default.
When i connect the computer direct to the 3COM office connect it works
fine.
So we've just eliminated the PC as a source of the trouble.
I'm betting that you have a wiring problem between the jacks and patch
panel.
John
--
John P. Dearing
A+, Network+, Server+
To reply: Just drop "YOURPANTS" in my address! 8-) |
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Siva U. Shankar
Guest
|
| Posted:
Mon Jun 06, 2005 8:20 am Post subject:
Re: Problem in Cable installation |
|
|
Hi guys!
I'm going to buy a cable tester (IC network) and check the wiremap tomorrow.
Since I dont have a cable tester at this moment.
I'll post a complete test results by tomorrow.
regards
Shankar
"James Knott" <james.knott@rogers.com> wrote in message
news:So6dnd-UDvpJdT_fRVn-uQ@rogers.com...
| Quote: | Siva U. Shankar wrote:
When i connect the computer direct to the 3COM office connect it works
fine.
Where is my mistake, I'm a new bie for cabling. Pls help me to sort it
out. Or suggest me a good website for me to refer..
You've obviously got a cable problem somewhere. You've got two patch
cables
and one wired between the jacks. First verify both patch cables, you've
already done one. Then check the cable between jacks. Is there another
one you can try? Check continuity and also that the pairing is correct.
Also, make sure the jacks are OK. Problems with them are rare, but I've
occasionally seen ones, where one of the gold wires was not in the proper
position.
If you can get your hands on one, a cable tester will help.
|
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| Back to top |
|
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James Knott
Guest
|
| Posted:
Mon Jun 06, 2005 3:48 pm Post subject:
Re: Problem in Cable installation |
|
|
Siva U. Shankar wrote:
| Quote: | The actual cable is 568A CAT 6 UTP cable.
|
There's no such thing as 568A cable. 568A or B only specifies how a cable
is connected. You'd use the exact same cable for either. |
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Justin Time
Guest
|
| Posted:
Mon Jun 06, 2005 9:48 pm Post subject:
Re: Problem in Cable installation |
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|
Guys,
Before you dig yourselves into a deeper hole regarding cable and if
they are 568A or 568B, you need to understand that cables marked as
568A or 568B meet the transmission requirements published in that
standard. You are confusing the standard with the wiring pattern.
Check out this link I selected at random where it talks about
applicable standards...
<http://bwccat.belden.com/ecat/jsp/Index.jsp?&P1=undefined&P2=undefined&P3=undefined&P4=undefined&P5=undefined&P6=undefined>
Rodgers Platt |
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James Knott
Guest
|
| Posted:
Mon Jun 06, 2005 10:28 pm Post subject:
Re: Problem in Cable installation |
|
|
Justin Time wrote:
| Quote: | Before you dig yourselves into a deeper hole regarding cable and if
they are 568A or 568B, you need to understand that cables marked as
568A or 568B meet the transmission requirements published in that
standard. You are confusing the standard with the wiring pattern.
Check out this link I selected at random where it talks about
applicable standards.
|
And what would the difference be between cables marked 568A or 568B???
Don't confuse marketing with specifications. Manufactures will often sell
something for a specific use and use commonly misused terms to describe it.
For example, how many times have you seen reference to "DB-9" serial port
connectors, even though there's no such animal? (the proper term is DE-9)
The cable has to meet CAT 5 specs, no matter how it's wired. The wiring
should comply with 568A or B, though it's not necessary for proper
operation, so long as proper pairing is maintained. |
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Justin
Guest
|
| Posted:
Tue Jun 07, 2005 12:20 am Post subject:
Re: Problem in Cable installation |
|
|
Siva U. Shankar wrote:
| Quote: | Hi guys!
I have a serious problem.
I've connected a 3com office connect 16 port switch like the following way
the netwotk is not working can u help me to figure out why?
3com office connect --> CAT5e 586A cable --> both end 586A wall socket
connected CAT5e cable --> straight through/ 586A cable --> to a winXP
computer
when connected this way it says in the computer, repeats these two
messages. - network cable is unplugged/acquiring network parameters (This
message is contineously repeated on its own. There is no connected lite
indicater in the switch either.
When i connect the computer direct to the 3COM office connect it works fine.
Where is my mistake, I'm a new bie for cabling. Pls help me to sort it out.
Or suggest me a good website for me to refer..
Thanks in advance.
Shankar
|
We're I've seen this type of error, it usually indicates a wiring
problem. Typically it's a split-pair (WH/BL with GR/WH, WH/GN with
BL/WH) or a reversed pair (WH/BL pair swapped with the WH/GN pair).
Since you mentioned on end is a Leviton that is label, and the other is
unlabeled, I would only make changes at the leviton end as you can see
what you've done. It start with swapping the WH/GN and WH/OR pairs to
fix a 568A-at-one-end-568B-at-the-other problem (a cross-over patch cord
at one end would also be a simple test before changing termination).
With the link light at only one end, lends me to think that it's a split
pair, and with the one end not having any indication for termination
pattern, you may have to wait for your tester to trouble shoot further.
Justin |
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Justin Time
Guest
|
| Posted:
Tue Jun 07, 2005 4:20 pm Post subject:
Re: Problem in Cable installation |
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|
James,
You are still confusing the wiring pattern with the transmission
specifications. Each version of the standard, from the original 568
through all the TSBs and addendums up through 568B has had a set of
transmission specifications cable manufacturers must meet in order for
the cable to be rated as Cat 3, Cat 4, Cat 5, Cat 5(e), Cat 6 and so
on. The manufacturers are now stamping their cables with the version
of the 568 standard they are compliant with. Thus, a cable stamped as
meeting the 568B specs has better transmission charcteristics than a
cable marked as 568 or 568A.
You keep referring to the wiring pattern as 568A and 568B and then hold
out the reference to a DB-9 serial port connector when the "proper"
term is DE-9. Well, the proper term for the wiring pattern used on
jacks and plugs is T568A or T568B, not 568A or 568B which denotes the
ANSI/TIA/EIA standard.
Rodgers Platt |
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