A Broadband and ADSL forum. BroadbanterBanter

Welcome to BroadbanterBanter.

You are currently viewing as a guest which gives you limited access to view most discussions and other FREE features. By joining our free community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload your own photos and access many other special features. Registration is fast, simple and absolutely free so please, join our community today.

Go Back   Home » BroadbanterBanter forum » Newsgroup Discussions » uk.telecom.broadband (UK broadband)
Site Map Home Register Authors List Search Today's Posts Mark Forums Read Web Partners

uk.telecom.broadband (UK broadband) (uk.telecom.broadband) Discussion of broadband services, technology and equipment as provided in the UK. Discussions of specific services based on ADSL, cable modems or other broadband technology are also on-topic. Advertising is not allowed.

Another filter question- no really a new one



 
 
Thread Tools Display Modes
  #1  
Old January 23rd 04, 04:46 PM posted to uk.telecom.broadband
Nat Stott
external usenet poster
 
Posts: 7
Default Another filter question- no really a new one

A friend is having problems with a home made extension lead from a filter to
the PC.

He has a standard bt socket on one end, an RJ45 on the other into the
filter.

A telephone handset gets no signal when plugged into the extension, although
many posts in this group have said the modem side of the filter is a
straight through connection.

He also has tried three different bt socket to RJ45 adapters to connect the
modem to the socket, one of these has four pins connected, the others only
have two pins. the middle two pins of the RJ45 socket are connected to the
outer two pins of the middle four of the BT socket.

The modem only works when using the four pin version, and the telephone
handset will work if one of these adapters is used instead of the filter at
the other end.

Can anyone explain how the BT to RJ45 connection should work, and why no
telephone signal on the modem side of the filter? Is this side filtered too?
And why does it need four wires connected, when all the books say only two
are needed?







---
Virus checked- NS
Checked by AVG anti-virus system (http://www.grisoft.com).
Version: 6.0.560 / Virus Database: 352 - Release Date: 08/01/2004


  #2  
Old January 23rd 04, 06:12 PM posted to uk.telecom.broadband
Phil Thompson
external usenet poster
 
Posts: 519
Default Another filter question- no really a new one

On Fri, 23 Jan 2004 16:46:56 -0000, "Nat Stott"
wrote:

He has a standard bt socket on one end, an RJ45 on the other into the
filter.


why ? did the modem have a BT plug or something.

A telephone handset gets no signal when plugged into the extension, although
many posts in this group have said the modem side of the filter is a
straight through connection.


it is an unfiltered connection, it is not "straight through" in the
sense that 2&5 on the BT plug are connected to 3&4 on the RJ11 / RJ45
socket http://www.adslnation.com/support/filters.php


The modem only works when using the four pin version, and the telephone
handset will work if one of these adapters is used instead of the filter at
the other end.


sounds like the adaptor is correcting a wiring error in the extension.
The 4 pin version of the adaptor must be connecting the pins with the
signal to the modem pins needing it.

Some modems that ship with a BT lead might have the input on 2&5 so
that a straight through cable (IDC connectors) gives the right
connection with an RJ11 plug on one end and a BT plug on the other.

On a similar basis some adaptors supplied with modems do funny things.
The only way to be sure is to examine the orginal lead, or the modem
manual, to see what it is expecting. Then determine if the adaptors
are pin for pin or crossover and check the leads. Draw it all on a bit
of paper and all will become clear. A condictivity tester would be
useful :-)

Phil
  #3  
Old January 23rd 04, 10:49 PM posted to uk.telecom.broadband
Nat Stott
external usenet poster
 
Posts: 7
Default Another filter question- no really a new one

The modem only works when using the four pin version, and the telephone
handset will work if one of these adapters is used instead of the filter

at
the other end.


sounds like the adaptor is correcting a wiring error in the extension.
The 4 pin version of the adaptor must be connecting the pins with the
signal to the modem pins needing it.


Thats what I thought too, but as he wired it himself I couldn't convince
him.

Some modems that ship with a BT lead might have the input on 2&5 so
that a straight through cable (IDC connectors) gives the right
connection with an RJ11 plug on one end and a BT plug on the other.

On a similar basis some adaptors supplied with modems do funny things.
The only way to be sure is to examine the orginal lead, or the modem
manual, to see what it is expecting. Then determine if the adaptors
are pin for pin or crossover and check the leads. Draw it all on a bit
of paper and all will become clear. A condictivity tester would be
useful :-)

Phil


Didn't have any testers when I popped round there at lunchtime. Need to have
another look.

Thanks for the link.



---
Virus checked- NS
Checked by AVG anti-virus system (http://www.grisoft.com).
Version: 6.0.560 / Virus Database: 352 - Release Date: 08/01/2004


 




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Filter Question! Franklin P Patchey uk.telecom.broadband (UK broadband) 3 January 23rd 04 05:00 PM
ADSL filter ¬Stephen Hammond uk.telecom.broadband (UK broadband) 2 October 25th 03 01:43 PM
phone socket with filter Big Dov uk.telecom.broadband (UK broadband) 4 October 25th 03 08:54 AM
AOL spam filter The Equalizer uk.telecom.broadband (UK broadband) 6 September 13th 03 10:54 PM


All times are GMT +1. The time now is 02:17 PM.


Powered by vBulletin® Version 3.6.4
Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.Content Relevant URLs by vBSEO 2.4.0
Copyright ©2004-2019 BroadbanterBanter.
The comments are property of their posters.