The Electrical Contractor Network

ECN Electrical Forum
Discussion Forums for Electricians, Inspectors and Related Professionals

Books, Tools and Test Equipment for Electrical and Construction Trades

Register Now!

Register Now!

We want your input!

Featured:
   

2017 NEC and Related
2017 NEC
Now Available!

   
Recent Posts
Industrail Control Panel bonding per 409.108
by sparkyinak
12/09/16 06:29 PM
Calling all Non-US members!! (Non-US only)
by aussie240
12/07/16 02:39 AM
Photo Upload Tutorial
by DanK
12/06/16 11:35 PM
Sprinklered equipment 26-008
by bigpapa
12/02/16 04:24 PM
On Delay Relay with Auto Reset
by Potseal
12/01/16 09:59 AM
New in the Gallery:
12.5A through 0.75mm˛ flex (just out of curiosity)
Shout Box

Top Posters (30 Days)
gfretwell 13
HotLine1 10
sparkyinak 9
Texas_Ranger 8
Potseal 6
Who's Online
0 registered (), 81 Guests and 4 Spiders online.
Key: Admin, Global Mod, Mod
Topic Options
Rate This Topic
#160263 - 09/05/05 08:11 PM T1 Smart Jack & RJ45
dereckbc Offline
Member

Registered: 10/08/03
Posts: 158
Loc: Tulsa, OK
Have a T1 smart Jack with a RJ45 demark. Never seen one like this, I ususally work the CO end, not CPE. Question is the RJ45 wired per TIA-568B?

My assumptions are:
Pin 1 Wht/Or, Tip RX Out
Pin 2 Or/Wht, Ring RX Out
Pin 3 Wht/Grn, N/A
Pin 4 Blu/Wht, Ring TX In
Pin 5 Wht/Blu, Tip TX In
Pin 6 Grn/Wht, N/A
Pin 7 Wht/Brn, N/A
Pin 8 Brn/Wht, N/A

Top
Study Guides for VDV / Structured Cabling Installers
#160264 - 09/06/05 09:36 AM Re: T1 Smart Jack & RJ45
electech Offline
Member

Registered: 02/18/02
Posts: 113
Loc: Northern Il
I think you have an RJ48 jack, not RJ45. For T1/HDSL it will be wired as an RJ48C (vs. RJ48S for DDS).

Pin 1 Ring1 (XMT to CPE) or/wh
Pin 2 Tip1 (XMT to CPE) wh/or
Pin 4 Ring (RCV from CPE) blu/wh
Pin 5 Tip (RCV from CPE) wh/blu

I know this conforms to some spec (since its the same for all the T1 jacks I've worked with), but I can't say for sure if its per TIA-568B. I got the jack pin-out from the CPE wiring diagram for a Westell DSAWM-204 type-200 T1/HDSL mounting (I'm quite familiar with their products...), and the wire color from a cheat sheet we had lying about (don't know if your connections will be the same).

Joe

Top
#160265 - 09/07/05 08:06 PM Re: T1 Smart Jack & RJ45
dereckbc Offline
Member

Registered: 10/08/03
Posts: 158
Loc: Tulsa, OK
Joe thanks for the response. I am certain it is RJ45, it is an 8-pin connector. I figured it out myself the next morning with a T-Bird. I was just hoping I could get a quick answer to save me some fumbling around. Thanks for your time.

FWIW, I guessed right on the pairs.

Top
#160266 - 09/08/05 04:11 PM Re: T1 Smart Jack & RJ45
dereckbc Offline
Member

Registered: 10/08/03
Posts: 158
Loc: Tulsa, OK
electech, after doing some more research I found RJ45 and RJ48 are the same plug, just wired slightly different. RJ48C is:

1 Orn/Wht, Ring In
2. Wht/Orn, Tip In
4. Blu/Wht Ring Out
5. Wht/Blu Tip Out

I got 1 & 2 reversed using TIA568B, but it still works, now I know better.

Thanks for taking time to help.

Top
#160267 - 09/09/05 09:39 PM Re: T1 Smart Jack & RJ45
techie Offline
Member

Registered: 05/17/05
Posts: 240
Loc: palo alto, ca usa
 Quote:
electech, after doing some more research I found RJ45 and RJ48 are the same plug, just wired slightly different.


RJ (Registered Jack) designations are a specification for a particular jack/plug, wired to a specific USOC wiring pattern as originally defined in fcc part 68.502, and now defined by some independant industry board that I can't remember the name of, nor can I find the newer designations.

A jack/plug does not gain an RJ designation until it is wired, although there are specific jacks designed for specific applications that could be specified by a RJ designation.. examples might be RJ-31x and RJ-38x jacks which have shorting bars for alarm supervision.

The 8 position modular jack/plug is used for a number of different USOC applications, with differing RJ designations. Ethernet, token ring, etc do not have RJ designations at all.

RJ-61, RJ-41, RJ-45, RJ-48, RJ-31, RJ-38, ethernet, and token ring all use a 8 position modular jack/plug, with different wiring patterns.

Top
#160268 - 09/10/05 10:10 AM Re: T1 Smart Jack & RJ45
jw electric Offline
Member

Registered: 09/08/05
Posts: 108
Loc: Asheboro, NC
I am so disappointed; I stopped in here thinking that I was going to hear something. The only thing I heard was the dog scratching his fleas.
_________________________
Mike

Top
#160269 - 09/16/05 05:54 AM Re: T1 Smart Jack & RJ45
techie Offline
Member

Registered: 05/17/05
Posts: 240
Loc: palo alto, ca usa
 Quote:
jw electric I am so disappointed; I stopped in here thinking that I was going to hear something. The only thing I heard was the dog scratching his fleas.


What's your problem?

Top
#160270 - 09/16/05 06:00 AM Re: T1 Smart Jack & RJ45
iwire Offline
Moderator

Registered: 01/05/03
Posts: 4343
Loc: North Attleboro, MA USA
He is a grumpy old man.
_________________________
Bob Badger
Construction & Maintenance Electrician
Massachusetts

Top
#160271 - 09/16/05 07:15 AM Re: T1 Smart Jack & RJ45
electech Offline
Member

Registered: 02/18/02
Posts: 113
Loc: Northern Il
Here is an excellant page on RJ45/48 pinouts: http://www.arcelect.com/RJ48C_and_RJ48S_8_position_jack_.htm

I got the following from a Cisco FAQ page:

Q: What is the difference between RJ48 and RJ45?

RJ48 has a keyed connector and a notched jack.
RJ45 does not have a key or a notch.
Both have 8 pins
Although an RJ45 connector will fit an RJ48 jack, the key on an RJ48 connector will prevent it from plugging into an RJ45 jack.

Top



ECN Electrical Forums - sponsored by Electrical Contractor Network - Electrical and Code Related Discussion for Electrical Contractors, Electricians, Inspectors, Instructors, Engineers and other related Professionals