I have an ISDN2 wall mounted box with 2 rj45 sockets underneath, the first socket (closest to the left) feeds an isdn phone, I would like to use the second socket (to the right) to use as an extra phone. I do not need different numbers to be set up, just to replicate what socket 1 does. However when I plug 2 lines into it, the second one will not sync..........Is there a reason for this??? I thought it might just act as a socket doubler, or is there some setting on the s-bus that would need changing???
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ISDN2 second socket
- Thread starter lagigolo
- Start date
I am assuming you are in Europe.
I am assuming these are RJ-45 style S interface jacks.
I am assuming you are using ISDN phones.
Usually the two jacks on an NT1/NTBA/NCTE are wired in parallel. Some basic troubleshooting should clear things up.
1) If you plug the original phone into the right socket does it work?
2) If you plug the new phone into the left socket (using the cable you are using currently) does it work?
3) If you plug the new phone into the the cable used for the first phone does it work?
The most likely problem is that if the new phone is any distance from the NTBA you'll need to terminate the phone that is further away and make sure the nearer phone is unterminated. There are several other rules to the allowable configurations of the S bus, so check you phone's manual for more examples.
If you find that both phones will work in the left socket and neother phone works in the right socket then get and RJ-45 style splitter and split off of the left jacket.
The final possibility is that for some reason your line is configure "point to point" rather than "multipoint". There is no good reason to do this, but soemtimes the Telco does this. IN this case they'll need to reconfigure your line at the exchange.
Good luck
I am assuming these are RJ-45 style S interface jacks.
I am assuming you are using ISDN phones.
Usually the two jacks on an NT1/NTBA/NCTE are wired in parallel. Some basic troubleshooting should clear things up.
1) If you plug the original phone into the right socket does it work?
2) If you plug the new phone into the left socket (using the cable you are using currently) does it work?
3) If you plug the new phone into the the cable used for the first phone does it work?
The most likely problem is that if the new phone is any distance from the NTBA you'll need to terminate the phone that is further away and make sure the nearer phone is unterminated. There are several other rules to the allowable configurations of the S bus, so check you phone's manual for more examples.
If you find that both phones will work in the left socket and neother phone works in the right socket then get and RJ-45 style splitter and split off of the left jacket.
The final possibility is that for some reason your line is configure "point to point" rather than "multipoint". There is no good reason to do this, but soemtimes the Telco does this. IN this case they'll need to reconfigure your line at the exchange.
Good luck
- Thread starter
- #3
Thanks ISDNman, yes I am in Europe, U.K.
1) Yes if i plug the original phone into the right socket it does work, but you are right it is only on a short lead.
2) If i plug the second phone into the left socket it works fine.
It seems like the right hand socket does not seem to like any distance, I will check on the point to point or multipoint config.
But as you say, the next logical step will be to try a splitter into socket 1, good thinking I would have missed that.
Thanks again and i will keep you informed of progress.
1) Yes if i plug the original phone into the right socket it does work, but you are right it is only on a short lead.
2) If i plug the second phone into the left socket it works fine.
It seems like the right hand socket does not seem to like any distance, I will check on the point to point or multipoint config.
But as you say, the next logical step will be to try a splitter into socket 1, good thinking I would have missed that.
Thanks again and i will keep you informed of progress.
Lagigolo
Seems likely this is a termination problem. When you have a distant phone it must be terminated. This may be set by dip switches or jumpers in the phone, or it may require an external in-line terminator.
Worst case I can tell you the correct pins to terminate and you can wire them into a pair of suraface mount jacks in-line with the distant phone.
Good luck.
Seems likely this is a termination problem. When you have a distant phone it must be terminated. This may be set by dip switches or jumpers in the phone, or it may require an external in-line terminator.
Worst case I can tell you the correct pins to terminate and you can wire them into a pair of suraface mount jacks in-line with the distant phone.
Good luck.
- Thread starter
- #5
Have now heard back from B.T. on this one also, they were talking about long and short settings and they now want me to put a connection box at the end of the line which will change the resistance. I have previously read about this so this will be my next step.
Check the manual and accessories box the two phone came in. Often they either have built in termination resistors (enabled by a switch) or they sometimes include an inline termination resistors. If you have a convenient place where you can buy resistors (like "Radio Shack" in the USA) I can tell you the right value to use and the pins that the resistors need to go across.
Best of luck.
Best of luck.
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