How do I sort out my phone line for the M1?

[Photon]

It is correct for his channel vision phone panel.

The pin-outs are correct for his panel, but if he uses a network cable, either 568 a or b, then pins 1 and 8 aren't twisted together, which would still be fine for a short run. His system will have better noise immunity if he crimps pins 1 & 8 to the same twisted pair.

 

[apostolakisl]

The pin-outs are correct for his panel, but if he uses a network cable, either 568 a or b, then pins 1 and 8 aren't twisted together, which would still be fine for a short run. His system will have better noise immunity if he crimps pins 1 & 8 to the same twisted pair.

I agree, it is a bit odd that they use two wires that are not a twisted pair and they clearly expect this as the example uses 568a scheme. I guess they assume the security panel is close by. Of course if you are crimping your own rj45 you can crimp down a twisted pair at 1 and 8 locations.

 

[apostolakisl]

A RJ31X or 38X uses USOC and not any of the 568 pinouts, which is what I believe you're alluding to.

Seriously, why don't you look at what the thread is about before hounding an incorrect point. Here is the pinout. Pin 1 and 8 connect to T1R1 on the Elk which goes to the service jack on the unit.

http://www.homecontrols.com/homecontrols/pdf/cvc0432_instr.pdf
Whitegreen/brown in 568A and whiteorange/brown in 568b.

 

[tmbrown97]

As far as them not sharing a pair, remember that Telco doesn't really care about twisted pairs; Most regular telco is pretty straight. Telco patch cords are flat and untwisted, and office wiring is usually over a 25-pair which is also untwisted... so you're not losing anything in using a separated pair like that.

 

[apostolakisl]

As far as them not sharing a pair, remember that Telco doesn't really care about twisted pairs; Most regular telco is pretty straight. Telco patch cords are flat and untwisted, and office wiring is usually over a 25-pair which is also untwisted... so you're not losing anything in using a separated pair like that.

Telephone isn't amplified at the phone, so em interference doesn't produce much noise. It is kind of like speaker wire is never twisted. , But it still would be better to twist them, just not that much better. I do believe they twist the pairs on the utility poles where they travel great distances. I'm not 100% on this, but I would be surprised if DSL didn't perform much bette on twisted pairs.

Which reminds me, you would want to put your DSL modem (if you have one) before the alarm system cutoff. Unless you are OK losing your DSL during an alarm.

 

[tmbrown97]

Which reminds me, you would want to put your DSL modem (if you have one) before the alarm system cutoff. Unless you are OK losing your DSL during an alarm.

Funny - I'm going circles with a telco at a property with a gate control... They put in DSL and didn't know what to do with the gate, so they moved it to a different line (rendering the intercom useless); I put it back and put the filter before the gate and put the DSL on its own jack. They moved my filter to behind the gate (so now if the gate uses the phone line it's not filtered)...

I wish they wouldn't share the pair with the line - I see so many issues where people don't understand the proper way and place of introducing the filter. Seems like the best way to handle these is an outdoor filter mounted right at the DMARC and splitting it myself so the DSL has its own pair. The whole situation gets even worse when the DSL is on a line that goes into a phone system - I've seen telcos instruct people to put a filter at every digital PBX phone in the building! (or say it's not compatible).

Back on topic - it's not just losing DSL during an alarm, but during every check-in, so multiple times per day I would assume.

 

[wuench]

I think there are modules that will do all the filtering/distribution/RJ31X/Surge for you. But I have a similar setup to the O.P with a superpro panel. What I did was wire in a DSL filter before the phone hub. So one port is broken out for DSL the other goes to the phone hub distribution w/ RJ31X and Surge. The only issue is I don't have surge protection on my DSL, so I risk frying my modem and possibly network. Gotta fix that one of these days...

 

[sanders2222]

Hey Guys, I made the connections, flipped the switch on my Channelvision panel, and the phone still works. So I'm thinking I got the wiring hooked up correctly. Now I have another start-up problem. I posted it to another topic.

 

[Del91574]

I agree, it is a bit odd that they use two wires that are not a twisted pair and they clearly expect this as the example uses 568a scheme. I guess they assume the security panel is close by. Of course if you are crimping your own rj45 you can crimp down a twisted pair at 1 and 8 locations.

The cables used and commonly provided for alarms and RJ 31X's are USOC and always have been, which predates the use and existance of the 568 schemes. Goes back to when Western Electric used to build all the jacks for the telco's and 31X's had to be installed by them. Actually, the majority of them were RJ38's that were modified by the Bell techs.

The twisted pairs are really only used for crosstalk purposes, which isn't really an issue with a single line phone cord/cable, even USOC 4 pair, since a 31X cable is just a feed/return. Telco is honestly recommended by all the big players to NOT be Cat. 5 cabling, however most of the spec's for construction and renovation spec it out, right or wrong.

 

[Del91574]

I agree, it is a bit odd that they use two wires that are not a twisted pair and they clearly expect this as the example uses 568a scheme. I guess they assume the security panel is close by. Of course if you are crimping your own rj45 you can crimp down a twisted pair at 1 and 8 locations.

The cables used and commonly provided for alarms and RJ 31X's are USOC and always have been, which predates the use and existance of the 568 schemes. Goes back to when Western Electric used to build all the jacks for the telco's and 31X's had to be installed by them. Actually, the majority of them were RJ38's that were modified by the Bell techs.

The twisted pairs are really only used for crosstalk purposes, which isn't really an issue with a single line phone cord/cable, even USOC 4 pair, since a 31X cable is just a feed/return. Telco is honestly recommended by all the big players to NOT be Cat. 5 cabling, however most of the spec's for construction and renovation spec it out, right or wrong.

 

[tmbrown97]

Talk about beating a dead horse... yes, technically to be 100% perfect the USOC wiring scheme should be followed because that would keep the wiring where pins 1,8 are on the same pair... but we all know it won't make a difference at all in the real world and that the advice that was given was just fine and will work just fine... I've posted this many times - know your audience... the idea was to keep things simple for the OP.