|
|
Joined: Jan 2007
Posts: 1,217
Member
|
OP
Member
Joined: Jan 2007
Posts: 1,217 |
What type of jack do you use for extending T1's? Is it rj48? And what is the benefit of using these as opposed to using rj45?
Aaron
|
|
|
Visit Atcom to get started with your new business VoIP phone system ASAP
Turn up is quick, painless, and can often be done same day.
Let us show you how to do VoIP right, resulting in crystal clear call quality and easy-to-use features that make everyone happy!
Proudly serving Canada from coast to coast.
|
|
|
|
Joined: May 2002
Posts: 17,722 Likes: 18
Member
|
|
Member
Joined: May 2002
Posts: 17,722 Likes: 18 |
The RJ (registered jack) is nothing more than what is wired to the pins. RJ45 is the pinout for a T1. Put whatever colors floats your boat as long as pins 1,2 and 4,5 have continuity on both ends, of course you do want full pairs. For my friend Ed, most folks who talk RJ48 really mean an 8p8c plug, which is not the same thing.
Retired phone dude
|
|
|
|
|
Joined: Jan 2007
Posts: 1,217
Member
|
|
OP
Member
Joined: Jan 2007
Posts: 1,217 |
When I see T1's or PRI's extended by telco, they use a certain jack that I thought had a diferent name than rj45 and therefore a certain purpose or function.
Aaron
|
|
|
|
|
Joined: May 2002
Posts: 17,722 Likes: 18
Member
|
|
Member
Joined: May 2002
Posts: 17,722 Likes: 18 |
I have been shown the error of my ways. I'm going to leave this to the experts. RJ is still just the pinouts but I may have screwed up the explanation.
Retired phone dude
|
|
|
|
|
Joined: Jan 2005
Posts: 15,379 Likes: 13
Moderator-Vertical, Vodavi, 1A2, Outside Wire
|
|
Moderator-Vertical, Vodavi, 1A2, Outside Wire
Joined: Jan 2005
Posts: 15,379 Likes: 13 |
What you have seen is an RJ48X jack that contains shorting bars so that when the connected equipment is unplugged, the circuit will remain alive.
This is done by creating a loopback condition. When there is nothing plugged in, pins 1/2 are shorted to pins 4/5. This means that the receive side of the circuit is sent right back out on the transmit side.
There are no more RJ45 jacks. They have been obsolete for about twenty years.
Ed Vaughn, MBSWWYPBX
|
|
|
|
|
Joined: May 2002
Posts: 17,722 Likes: 18
Member
|
|
Member
Joined: May 2002
Posts: 17,722 Likes: 18 |
OK now listen to the expert. :bow:
Retired phone dude
|
|
|
|
|
Joined: Jan 2007
Posts: 1,217
Member
|
|
OP
Member
Joined: Jan 2007
Posts: 1,217 |
We extend t1's on regular cat5e (rj45?) jacks all the time, I'm thinking of telling my company that we should mandate using rj48x jacks for t1 extensions. But what is the benefit of having the circuit looped when the equipment is unplugged? Is it that telco won't get alarms?
Aaron
|
|
|
|
|
Joined: Jan 2005
Posts: 15,379 Likes: 13
Moderator-Vertical, Vodavi, 1A2, Outside Wire
|
|
Moderator-Vertical, Vodavi, 1A2, Outside Wire
Joined: Jan 2005
Posts: 15,379 Likes: 13 |
Pretty much so. I was told that some carriers will actually turn a circuit down if a looped condition falls off after a certain amount of time. I've never seen that happen.
By maintaining the proper jacks and wiring, a circuit can be extended without needing to have equipment connected at that time.
Ed Vaughn, MBSWWYPBX
|
|
|
|
|
Joined: Jan 2007
Posts: 1,217
Member
|
|
OP
Member
Joined: Jan 2007
Posts: 1,217 |
Aaron
|
|
|
|
|
Joined: May 2002
Posts: 17,722 Likes: 18
Member
|
|
Member
Joined: May 2002
Posts: 17,722 Likes: 18 |
It's also a good way for you to do an initial test. If you show the circuit down and you unplug and it syncs at the NID you know it's your problem.
I do apologize for my misinformation last night.
Retired phone dude
|
|
|
|
Forums84
Topics94,294
Posts638,834
Members49,769
| |
Most Online5,661
May 23rd, 2018
|
|
|
0 members (),
156
guests, and
354
robots. |
|
Key:
Admin,
Global Mod,
Mod
|
|
|
|
